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Datasheet, Version 3.0, February 2002
ICE2AS01
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ICE2AS01G
ICE2BS01
ICE2BS01G
Off-Line SMPS Current Mode
Controller
Power Management & Supply
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ICE2AS01/G
ICE2BS01/G
Revision History:
2001-10-31
Previous Version:
V2.1
Page
Subjects (major changes since last revision)
ICE2BS01 is added
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Datasheet
For questions on technology, delivery and prices please contact the Infineon Technologies Offices in Germany or
the Infineon Technologies Companies and Representatives worldwide: see our webpage at http://
www.infineon.com
CoolMOS™, CoolSET™ are trademarks of Infineon Technologies AG.
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Your feedback will help us to continuously improve the quality of this document.
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Edition 2001-10-31
Published by Infineon Technologies AG,
St.-Martin-Strasse 53,
D-81541 München
© Infineon Technologies AG 1999.
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as warranted char-
acteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding
circuits, descriptions and charts stated herein.
Infineon Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest Infin-
eon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support
devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Off-Line SMPS Current Mode Controller
Product Highlights
• Enhanced Protection Functions all
with Auto Restart
www.DataSheet4U.comLowest Standby Power Dissipation
• Very Accurate Current Limiting
P-DIP-8-4
P-DSO-8-3
Features
• Only few external Components required
• Input Undervoltage Lockout
• 67kHz/100kHz fixed Switching Frequency
• Max Duty Cycle 72%
• Low Power Standby Mode to support
“Blue Angle” Norm
• Latched Thermal Shut Down
• Overload and Open Loop Protection
• Overvoltage Protection during Auto Restart
• Adjustable Peak Current Limitation via
External Resistor
• Overall Tolerance of Current Limiting < ±5%
• Internal Leading Edge Blanking
• Soft Start
• Soft Switching for Low EMI
Description
This stand alone controller provides several special
enhancements to satisfy the needs for low power standby
and protection features. In standby mode frequency
reduction is used to lower the power consumption and
provide a stable output voltage in this mode. The frequency
reduction is limited to 20kHz / 21.5 kHz (typ.) to avoid
audible noise. In case of failure modes like open loop,
overvoltage or overload due to short circuit the device
switches in Auto Restart Mode which is controlled by the
internal protection unit. By means of the internal precise
peak current limitation the dimension of the transformer and
the secondary diode can be lower which leads to more cost
efficiency.
Typical Application
85 ... 270 VAC
RStart-up
VCC
CVCC
SoftS
CSoft Start
FB
Low Power
Power
StandBy Management
Soft-Start Control
PWM Controller
Current Mode
Precise Low Tolerance
Peak Current Limitation
Protection Unit
ICE2AS01 / ICE2BS01
Feedback
Snubber
Gate
Isense
GND
RSense
Type
ICE2AS01
ICE2AS01G
ICE2BS01
ICE2BS01G
Datasheet
Preliminary Data
Ordering Code
Q67040-S4472
Q67040-S4473
Q67040-S4475
Q67040-S4476
3
Frequency
100kHz
100kHz
67kHz
67kHz
Feedback
+
Converter
DC Output
-
Package
P-DIP-8-4
P-DSO-8-3
P-DIP-8-4
P-DSO-8-3
February 2002


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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Table of Contents
Page
1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Pin Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 Pin Configuration and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3
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4
4.1
4.2
4.2.1
4.2.2
4.3
4.4
4.4.1
4.4.2
4.5
4.5.1
4.5.2
4.6
4.7
4.8
4.8.1
4.8.2
4.8.3
Representative Blockdiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Improved Current Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
PWM-OP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
PWM-Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Oscillator and Frequency Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Frequency Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Leading Edge Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Propagation Delay Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
PWM-Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Protection Unit (Auto Restart Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Overload & Open loop with normal load . . . . . . . . . . . . . . . . . . . . . . . . .12
Overvoltage due to open loop with no load . . . . . . . . . . . . . . . . . . . . . . .13
Thermal Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5
5.1
5.2
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Supply Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Internal Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Control Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Protection Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Driver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
6 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7 Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Datasheet
Preliminary Data
4
February 2002


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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
1 Pin Configuration and Functionality
1.1 Pin Configuration
1.2 Pin Functionality
Pin
1
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3
4
5
6
7
8
Symbol Function
N.C.
SoftS
FB
Isense
Gate
VCC
GND
N.C.
Not connected
Soft Start & Auto Restart Control
Regulation Fedback
Controller Current Sense Input
Driver Output
Controller Supply Voltage
Controller Ground
Not connected
Package P-DIP-8-4
G-Package P-DSO-8-3
SoftS (Soft Start & Auto Restart Control)
This pin combines the function of Soft Start in case of
Start Up and Auto Restart Mode and the controlling of
the Auto Restart Mode in case of an error detection.
FB (Feedback)
The information about the regulation is provided by the
FB Pin to the internal Protection Unit and to the internal
PWM-Comparator to control the duty cycle.
Isense (Current Sense)
The Current Sense pin senses the voltage developed
on the series resistor inserted in the source of the
external Power Switch. When Isense reaches the
internal threshold of the Current Limit Comparator, the
Driver output is disabled. By this mean the Over
Current Detection is realized.
Furthermore the current information is provided for the
PWM-Comparator to realize the Current Mode.
N.C.
1
SoftS
2
FB
Isense
3
4
8 N.C.
7 GND
6 VCC
5
Gate
Gate (Driver Output)
The current and slew rate capability of this pin are
suited to drive Power MOSFETs.
VCC (Power supply)
This pin is the positiv supply of the IC. The operating
range is between 8.5V and 21V.
To provide overvoltage protection the driver gets
disabled when the voltage becomes higher than 16.5V
during Start up Phase.
Figure 1
GND (Ground)
Pin Configuration (top view) This pin is the ground of the primary side of the SMPS.
Datasheet
Preliminary Data
5
February 2002


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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Representative Blockdiagram
2 Representative Blockdiagram
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Figure 2
Datasheet
Preliminary Data
6
February 2002


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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
3 Functional Description
3.1 Power Management
3.2 Improved Current Mode
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VCC
M ain Line (100V-380V)
R Start-Up
C VCC
Prim ary W inding
Power Management
U n d e rv o lta g e
Lockout
13.5V
In te rn a l
Bias
8 .5 V
Power-Down
Reset
Power-Up
Reset
V o lta g e
R efe ren c e
6.5V
5.3V
4.8V
4.0V
SoftS
6.5V
R Soft-Start
RQ
PW M-Latch
SQ
Error-Latch
Soft-S tart C om parator
C Soft-Start
T1
E rro r-D e te c tio n
Soft-Start Com parator
FB PW M -Latch
RQ
D rive r
PW M Comparator
SQ
0.8V
PWM OP
x3.65
Im proved
Current Mode
Isense
Figure 4 Current Mode
Current Mode means that the duty cycle is controlled
by the slope of the primary current. This is done by
comparison the FB signal with the amplified current
sense signal.
Am plified Current Signal
Figure 3 Power Management
The Undervoltage Lockout monitors the external
supply voltage VVCC. In case the IC is inactive the
current consumption is max. 55µA. When the SMPS is
plugged to the main line the current through RStart-up
charges the external Capacitor CVCC. When VVCC
exceeds the on-threshold VCCon=13.5V the internal bias
circuit and the voltage reference are switched on. After
it the internal bandgap generates a reference voltage
VREF=6.5V to supply the internal circuits. To avoid
uncontrolled ringing at switch-on a hysteresis is
implemented which means that switch-off is only after
active mode when Vcc falls below 8.5V.
In case of switch-on a Power Up Reset is done by
reseting the internal error-latch in the protection unit.
When VVCC falls below the off-threshold VCCoff=8.5V the
internal reference is switched off and the Power Down
reset let T1 discharging the soft-start capacitor CSoft-Start
at pin SoftS. Thus it is ensured that at every switch-on
the voltage ramp at pin SoftS starts at zero.
FB
0.8V
D rive r
t
Ton
t
Figure 5 Pulse Width Modulation
In case the amplified current sense signal exceeds the
FB signal the on-time Ton of the driver is finished by
reseting the PWM-Latch (see Figure 5).
Datasheet
Preliminary Data
7
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
The primary current is sensed by the series resistor
RSense inserted in the source of the external Power
Switch. By means of Current Mode the regulation of the
secondary voltage is insensitive on line variations. Line
variation causes varition of the increasing current slope
which controls the duty cycle.
The external RSense allows an individual adjustment of
the maximum source current of the external Power
Switch.
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Soft-Start Com parator
PW M Com parator
FB
PW M-Latch
O scillator
VOSC
0.3V
C5
Gate Driver
VOSC
max.
Duty Cycle
Voltage Ram p
0.8V
FB
0.3V
G ate Driver
t
t
T2
C1
0.8V
10k
R1 V1
20pF
x3.65
PWM OP
Voltage Ram p
Figure 6 Improved Current Mode
To improve the Current Mode during light load
conditions the amplified current ramp of the PWM-OP
is superimposed on a voltage ramp, which is built by
the switch T2, the voltage source V1 and the 1st order
low pass filter composed of R1 and C1 (see Figure 6,
Figure 7). Every time the oscillator shuts down for max.
duty cycle limitation the switch T2 is closed by VOSC.
When the oscillator triggers the Gate Driver T2 is
opened so that the voltage ramp can start (see Figure
7).
In case of light load the amplified current ramp is to
small to ensure a stable regulation. In that case the
Voltage Ramp is a well defined signal for the
comparison with the FB-signal. The duty cycle is then
controlled by the slope of the Voltage Ramp.
By means of the C5 Comparator the Gate Driver is
switched-off until the voltage ramp exceeds 0.3V. It
allows the duty cycle to be reduced continously till 0%
by decreasing VFB below that threshold.
Figure 7 Light Load Conditions
t
3.2.1 PWM-OP
The input of the PWM-OP is applied over the internal
leading edge blanking to the external sense resistor
RSense connected to pin ISense. RSense converts the
source current into a sense voltage. The sense voltage
is amplified with a gain of 3.65 by PWM OP. The output
of the PWM-OP is connected to the voltage source V1.
The voltage ramp with the superimposed amplified
current singal is fed into the positive inputs of the PWM-
Comparator, C5 and the Soft-Start-Comparator.
3.2.2 PWM-Comparator
The PWM-Comparator compares the sensed current
signal of the external Power Switch with the feedback
signal VFB (see Figure 8). VFB is created by an external
optocoupler or external transistor in combination with
the internal pullup resistor RFB and provides the load
information of the feedback circuitry. When the
amplified current signal of the external Power Switch
exceeds the signal VFB the PWM-Comparator switches
off the Gate Driver.
Datasheet
Preliminary Data
8
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
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6.5V
RFB Soft-Start Com parator
FB PW M -Latch
PW M Comparator
O p to c o u p le r
0 .8 V
PWM OP
Isense
x3.65
Im p ro ved
Current Mode
Figure 8 PWM Controlling
3.3 Soft-Start
V SoftS
5.6V
5.3V
T Soft-Start
G ate Driver
t
pullup resistor RSoft-Start. The Soft-Start-Comparator
compares the voltage at pin SoftS at the negative input
with the ramp signal of the PWM-OP at the positive
input. When Soft-Start voltage VSoftS is less than
Feedback voltage VFB the Soft-Start-Comparator limits
the pulse width by reseting the PWM-Latch (see Figure
9). In addition to Start-Up, Soft-Start is also activated at
each restart attempt during Auto Restart. By means of
the above mentioned CSoft-Start the Soft-Start can be
defined by the user. The Soft-Start is finished when
VSoftS exceeds 5.3V. At that time the Protection Unit is
activated by Comparator C4 and senses the FB by
Comparator C3 wether the voltage is below 4.8V which
means that the voltage on the secondary side of the
SMPS is settled. The internal Zener Diode at SoftS with
breaktrough voltage of 5.6V is to prevent the internal
circuit from saturation (see Figure 10).
5.6V
S o ftS
6 .5 V
Power-Up Reset
R Soft-Start
E rro r-L a tc h
RQ
6.5V
5 .3 V
C4
G2 S Q
4 .8 V
R FB
FB
C3
C lo c k
RQ
G ate
D river
SQ
PW M -Latch
Figure 10 Activation of Protection Unit
The Start-Up time TStart-Up within the converter output
voltage VOUT is settled must be shorter than the Soft-
Start Phase TSoft-Start (see Figure 11).
C Soft Start
=
T Soft Start
R Soft Start × 1,69
By means of Soft-Start there is an effective
minimization of current and voltage stresses on the
external Power Switch, the clamp circuit and the output
overshoot and prevents saturation of the transformer
during Start-Up.
t
Figure 9 Soft-Start Phase
The Soft-Start is realized by the internal pullup resistor
RSoft-Start and the external Capacitor CSoft-Start (see
Figure 2). The Soft-Start voltage VSoftS is generated by
charging the external capacitor CSoft-Start by the internal
Datasheet
Preliminary Data
9
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
V SoftS
5.3V
kHz
fnorm
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VFB
T Soft-Start
4.8V
t
VOUT
t
VOUT
T Start-Up
Figure 11 Start Up Phase
t
3.4 Oscillator and Frequency
Reduction
3.4.1 Oscillator
The oscillator generates a frequency fswitch = 100kHz. A
resistor, a capacitor and a current source and current
sink which determine the frequency are integrated. The
charging and discharging current of the implemented
oscillator capacitor are internally trimmed, in order to
achieve a very accurate switching frequency. The ratio
of controlled charge to discharge current is adjusted to
reach a max. duty cycle limitation of Dmax=0.72.
fstandby
1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9
VFB
fnorm:
fstandby:
ICE2BS01
67kHz
20kHz
ICE2AS01
100kHz
21.5kHz
2V
Figure 12 Frequency Dependence
3.5 Current Limiting
There is a cycle by cycle current limiting realised by the
Current-Limit Comparator to provide an overcurrent
detection. The source current of the external Power
Switch is sensed via an external sense resistor RSense .
By means of RSense the source current is transformed to
a sense voltage VSense. When the voltage VSense
exceeds the internal threshold voltage Vcsth the
Current-Limit-Comparator immediately turns off the
gate drive. To prevent the Current Limiting from
distortions caused by leading edge spikes a Leading
Edge Blanking is integrated at the Current Sense.
Furthermore a Propagation Delay Compensation is
added to support the immedeate shut down of the
Power Switch in case of overcurrent.
3.5.1 Leading Edge Blanking
V S ense
3.4.2 Frequency Reduction
The frequency of the oscillator is depending on the
voltage at pin FB. The dependence is shown in Figure
12. This feature allows a power supply to operate at
lower frequency at light loads thus lowering the
switching losses while maintaining good cross
regulation performance and low output ripple. In case
of low power the power consumption of the whole
SMPS can now be reduced very effective. The minimal
reachable frequency is limited to 20kHz / 21.5 kHz to
avoid audible noise in any case.
V csth
tLEB = 220ns
t
Figure 13 Leading Edge Blanking
Each time when the external Power Switch is switched
on a leading spike is generated due to the primary-side
capacitances and secondary-side rectifier reverse
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Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
recovery time. To avoid a premature termination of the
switching pulse this spike is blanked out with a time
constant of tLEB = 220ns. During that time the output of
the Current-Limit Comparator cannot switch off the
gate drive.
VOSC max. Duty Cycle
3.5.2 Propagation Delay Compensation
In case of overcurrent detection the shut down of the
www.DataSheet4Ue.cxotemrnal Power Switch is delayed due to the
propagation delay of the circuit. This delay causes an
overshoot of the peak current Ipeak which depends on
the ratio of dI/dt of the peak current (see Figure 14).
.
VSense
Vcsth
off time
Propagation Delay t
ISense
Ipeak2
Ipeak1
ILim it
S ig n a l2
IO vershoot2
S ig n a l1
tPropagation Delay
IO vershoot1
Signal1
Signal2
Figure 15 Dynamic Voltage Threshold Vcsth
t
t
Figure 14 Current Limiting
The overshoot of Signal2 is bigger than of Signal1 due
to the steeper rising waveform.
A propagation delay compensation is integrated to
bound the overshoot dependent on dI/dt of the rising
primary current. That means the propagation delay
time between exceeding the current sense threshold
Vcsth and the switch off of the external Power Switch is
compensated over temperature within a range of at
least
.
0
RSense
×
dI peak
dt
1 dVSense
dt
So current limiting is now capable in a very accurate
way (see Figure 16).
E.g. Ipeak = 0.5A with RSense = 2 . Without propagation
delay compensation the current sense threshold is set
to a static voltage level Vcsth=1V. A current ramp of
dI/dt = 0.4A/µs, that means dVSense/dt = 0.8V/µs, and a
propagation delay time of i.e. tPropagation Delay =180ns
leads then to an Ipeak overshoot of 12%. By means of
propagation delay compensation the overshoot is only
about 2% (see Figure 15).
The propagation delay compensation is done by
means of a dynamic threshold voltage Vcsth (see Figure
15). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
V
1,3
1,25
1,2
1,15
1,1
1,05
1
0,95
0,9
0
with compensation
without compensation
0,2 0,4 0,6 0,8
1 1,2 1,4 1,6 1,8
dVSense
dt
2V
µs
Figure 16 Overcurrent Shutdown
3.6 PWM-Latch
The oscillator clock output applies a set pulse to the
PWM-Latch when initiating the external Power Switch
conduction. After setting the PWM-Latch can be reset
by the PWM-OP, the Soft-Start-Comparator, the
Current-Limit-Comparator, Comparator C3 or the
Error-Latch of the Protection Unit. In case of reseting
the driver is shut down immediately.
3.7 Driver
The driver is a fast totem pole gate drive, which is
designed to avoid cross conduction currents and which
is equipped with a Zener diode Z1 (see Figure 17) in
order to improve the control of the gate attached power
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
transistors as well as to protect them against
undesirable gate overvoltages.
PW M-Latch
www.DataSheet4U.com
1
VCC
Z1
G a te
failure modes are latched by an Error-Latch. Additional
thermal shutdown is latched by the Error-Latch. In case
of those failure modes the Error-Latch is set after a
blanking time of 5µs and the external Power Switch is
shut down. That blanking prevents the Error-Latch from
distortions caused by spikes during operation mode.
3.8.1
Overload & Open loop with normal
load
Overload & Open loop/normal load
5µs Blanking
FB
4.8V
F a ilu re
D e te c tio n
Figure 17 Gate Driver
At voltages below the undervoltage lockout threshold
VVCCoff the gate drive is active low.
The driver-stage is optimized to minimize EMI and to
provide high circuit efficiency. This is done by reducing
the switch on slope when reaching the external Power
Switch threshold. This is achieved by a slope control of
the rising edge at the drivers output (see Figure 18).
V Gate ca. t = 130ns
S o ftS
5.3V
D riv e r
Soft-Start Phase
T Burst1
T Restart
t
t
CLoad = 1nF
VCC
5V 13.5V
t
Figure 18 Gate Rising Slope
8.5V
t
t
Thus the leading switch on spike is minimized. When
the external Power Switch is switched off, the falling
shape of the driver is slowed down when reaching 2V
to prevent an overshoot below ground. Furthermore the
driver circuit is designed to eliminate cross conduction
of the output stage.
Figure 19 Auto Restart Mode
Figure 19 shows the Auto Restart Mode in case of
overload or open loop with normal load. The detection
of open loop or overload is provided by the Comparator
C3, C4 and the AND-gate G2 (see Figure20).
3.8 Protection Unit (Auto Restart Mode)
An overload, open loop and overvoltage detection is
integrated within the Protection Unit. These three
Datasheet
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
6.5V
Power Up Reset
SoftS
R Soft-Start
C Soft-Start
www.DataSheet4U.com
T1
FB
C4
5.3V
4.8V
C3
R FB
6.5V
Error-Latch
G2
3.8.2
Overvoltage due to open loop with
no load
Open loop & no load condition
5µs Blanking
FB
4.8V
F a ilu r e
D etection
SoftS
5.3V
4.0V
Soft-Start Phase
O v e rv o lta g e
Detection Phase
t
Figure 20 FB-Detection
The detection is activated by C4 when the voltage at
pin SoftS exceeds 5.3V. Till this time the IC operates in
the Soft-Start Phase. After this phase the comparator
C3 can set the Error-Latch in case of open loop or
overload which leads the feedback voltage VFB to
exceed the threshold of 4.8V. After latching VCC
decreases till 8.5V and inactivates the IC. At this time
the external Soft-Start capacitor is discharged by the
internal transistor T1 due to Power Down Reset. When
the IC is inactive VCC increases till VCCon = 13.5V by
charging the Capacitor CVCC by means of the Start-Up
Resistor RStart-Up. Then the Error-Latch is reset by
Power Up Reset and the external Soft-Start capacitor
CSoft-Start is charged by the internal pullup resistor RSoft-
Start . During the Soft-Start Phase which ends when the
voltage at pin SoftS exceeds 5.3V the detection of
overload and open loop by C3 and G2 is inactive. In this
way the Start Up Phase is not detected as an overload.
But the Soft-Start Phase must be finished within the
Start Up Phase to force the voltage at pin FB below the
failure detection threshold of 4.8V.
D river
T Burst2
T Restart
t
VCC
16.5V
13.5V
8.5V
O vervoltage D etection
t
t
Figure 21 Auto Restart Mode
Figure 21 shows the Auto Restart Mode for open loop
and no load condition. In case of this failure mode the
converter output voltage increases and also VCC. An
additional protection by the comparators C1, C2 and
the AND-gate G1 is implemented to consider this
failure mode (see Figure 22).
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
VCC
www.DataSheet4U.com
S o ftS
6.5V
16.5V
R Soft-Start
4.0V
C1
C2
Error Latch
G1
C Soft-Start
T1
Power Up Reset
Figure 22 Overvoltage Detection
The overvoltage detection is provided by Comparator
C1 only in the first time during the Auto Restart Mode
till the Soft-Start voltage exceeds the threshold of the
Comparator C2 at 4.0V and the voltage at pin FB is
above 4.8V. When VCC exceeds 16.5V during the
overvoltage detection phase C1 can set the Error-Latch
and the Burst Phase during Auto Restart Mode is
finished earlier. In that case TBurst2 is shorter than TSoft-
Start . By means of C2 the normal operation mode is
prevented from overvoltage detection due to varying of
VCC concerning the regulation of the converter output.
When the voltage VSoftS is above 4.0V the overvoltage
detection by C1 is deactivated.
3.8.3 Thermal Shut Down
Thermal Shut Down is latched by the Error-Latch when
junction temperature Tj of the pwm controller is
exceeding an internal threshold of 140°C. In that case
the IC switches in Auto Restart Mode.
Note:
All the values which are mentioned in the
functional description are typical. Please refer
to Electrical Characteristics for min/max limit
values.
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Electrical Characteristics
4 Electrical Characteristics
4.1 Absolute Maximum Ratings
Note: Absolute maximum ratings are defined as ratings, which when being exceeded may lead to destruction
of the integrated circuit. For the same reason make sure, that any capacitor that will be connected to pin 6
(VCC) is discharged before assembling the application circuit.
www.DataSheet4U.com
Parameter
Symbol
Limit Values Unit Remarks
min. max.
VCC Supply Voltage
VCC
-0.3 22
V
FB Voltage
SoftS Voltage
ISense
Junction Temperature
Storage Temperature
Thermal Resistance
Junction-Ambient
VFB
VSoftS
ISense
Tj
TS
RthJA
-0.3 6.5
V
-0.3 6.5
V
-0.3 3
V
-40 150 °C
Controller & CoolMOS
-50 150 °C
- 90 K/W P-DIP-8-4
Thermal Resistance
Junction-Ambient
RthJA - 185 K/W P-DSO-8-3
ESD Capability1)
VESD - 2 kV Human Body Model
1) Equivalent to discharging a 100pF capacitor through a 1.5 kseries resistor
4.2 Operating Range
Note: Within the operating range the IC operates as described in the functional description.
Parameter
VCC Supply Voltage
Junction Temperature of
Controller
Symbol
VCC
TJCon
Limit Values
min. max.
VCCoff
-25
21
130
Unit
V
°C
Remarks
limited due to thermal shut down of
controller
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Electrical Characteristics
4.3 Characteristics
Note: The electrical characteristics involve the spread of values guaranteed within the specified supply voltage
and junction temperature range TJ from – 25 °C to 125 °C.Typical values represent the median values,
which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 15 V is assumed.
4.3.1 Supply Section
www.DataSheet4UP.caormameter
Symbol
Start Up Current
Supply Current with Inactiv
Gate
IVCC1
IVCC2
Supply Current with Activ Gate IVCC3
ICE2AS01/G
min.
-
-
Limit Values
typ. max.
27 55
5.3 7
Unit
µA
mA
-
6.5 8
mA
Supply Current with Activ Gate IVCC3
ICE2BS01/G
-
6 7.5 mA
VCC Turn-On Threshold
VCC Turn-Off Threshold
VCC Turn-On/Off Hysteresis
VCCon
VCCoff
VCCHY
13 13.5 14 V
- 8.5 - V
4.5 5
5.5 V
4.3.2 Internal Voltage Reference
Test Condition
VCC=VCCon -0.1V
VSoftS = 0
IFB = 0
VSoftS = 5V
IFB = 0
CGate = 1nF
VSoftS = 5V
IFB = 0
CGate = 1nF
Parameter
Symbol
Trimmed Reference Voltage VREF
4.3.3 Control Section
min.
6.37
Limit Values
typ. max.
6.50 6.63
Unit
V
Test Condition
measured at pin FB
Parameter
Oscillator Frequency
ICE2AS01/G
Oscillator Frequency
ICE2BS01/G
Reduced Osc. Frequency
ICE2AS01/G
Reduced Osc. Frequency
ICE2AS01/G
Symbol
fOSC1
fOSC3
fOSC2
fOSC4
min.
93
Limit Values
typ. max.
100 107
Unit
kHz
62 67 72 kHz
- 21.5 - kHz
- 20 - kHz
Test Condition
VFB = 4V
VFB = 4V
VFB = 1V
VFB = 1V
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Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Electrical Characteristics
Frequency Ratio fosc1/fosc2
ICE2AS01/G
Frequency Ratio fosc3/fosc4
ICE2BS01/G
Max Duty Cycle
Dmax
Min Duty Cycle
Dmin
w w w . D a t aPSWhMe-OePtG4aiUn . c o m
Max. Level of Voltage Ramp
AV
VMax-Ramp
VFB Operating Range Min Level VFBmin
VFB Operating Range Max level VFBmax
Feedback Resistance
RFB
Soft-Start Resistance
RSoft-Start
4.3.4 Protection Unit
4.5
3.18
0.67
0
3.45
-
0.3
-
3.0
42
4.65
3.35
0.72
-
3.65
0.85
-
-
3.7
50
4.9
3.53
0.77
-
3.85
-
-
4.6
4.9
62
V
V
V
k
k
VFB < 0V
Parameter
Symbol
Over Load & Open Loop
Detection Limit
Activation Limit of Overload &
Open Loop Detection
Deactivation Limit of
Overvoltage Detection
Overvoltage Detection Limit
VFB2
VSoftS1
VSoftS2
VVCC1
Latched Thermal Shutdown
Spike Blanking
TjSD
tSpike
4.3.5 Current Limiting
min.
4.65
Limit Values
typ. max.
4.8 4.95
Unit
V
5.15 5.3
5.46 V
3.88 4.0
4.12 V
16 16.5 17.2 V
130 140 150 °C
- 5 - µs
Test Condition
VSoftS > 5.5V
VFB > 5V
VFB > 5V
VCC > 17.5V
VSoftS < 3.8V
VFB > 5V
guaranteed by design
Parameter
Symbol
Peak Current Limitation (incl.
Propagation Delay Time)
(see Figure 7)
Leading Edge Blanking
Vcsth
tLEB
min.
0.95
Limit Values
typ. max.
1.00 1.05
Unit
V
- 220 - ns
Test Condition
dVsense / dt = 0.6V/µs
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Electrical Characteristics
4.3.6 Driver Section
Parameter
GATE Low Voltage
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Symbol
VGATE
min.
-
Limit Values
typ. max.
0.95 1.2
Unit
V
- 1.0 1.5 V
GATE High Voltage
VGATE
- 0.88 -
- 1.6 2.2
-0.2 0.2
-
- 11.5 -
- 10 -
V
V
V
V
V
- 7.5 - V
GATE Rise Time
tr - 160
GATE Fall Time
tf - 65
GATE Current, Peak,
Rising Edge
IGATE
-0.5 -
GATE Current, Peak,
Falling Edge
IGATE
-
-
1) Transient reference value
2) Design characteristics (not meant for production testing)
-
-
-
0.7
ns
ns
A
A
Test Condition
VVCC = 5 V
IGate = 5 mA
VVCC = 5 V
IGate = 20 mA
IGate = 0 A
IGate = 50 mA
IGate = -50 mA
VVCC = 20V
CL = 4.7nF
VVCC = 11V
CL = 4.7nF
VVCC = VVCCoff + 0.2V
CL = 4.7nF
VGate = 2V ...9V1)
CL = 4.7nF
VGate = 9V ...2V1)
CL = 4.7nF
CL = 4.7nF2)
CL = 4.7nF2)
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Typical Performance Characteristics
5 Typical Performance Characteristics
40
38
36
34
32
www.DataSheet4U.com30
28
26
24
22
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 23 Start Up Current IVCC1 vs. Tj
6,0
5,7
5,4
5,1
4,8
4,5
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 24 Supply Current IVCC2 vs. Tj
7,0
ICE2ASO1
6,8 ICE2ASO1G
6,6
6,4
6,2
6,0
5,8
ICE2BSO1
5,6 ICE2BSO1G
5,4
5,2
5,0
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 25 Supply Current IVCC3 vs. Tj
13,58
13,56
13,54
13,52
13,50
13,48
13,46
13,44
13,42
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 26 VCC Turn-On Threshold VVCCon vs. Tj
8,67
8,64
8,61
8,58
8,55
8,52
8,49
8,46
8,43
8,40
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 27 VCC Turn-Off Threshold VVCCoff vs. Tj
5,10
5,07
5,04
5,01
4,98
4,95
4,92
4,89
4,86
4,83
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 28 VCC Turn-On/Off HysteresisVVCCHY vs. Tj
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Typical Performance Characteristics
6,55
6,54
6,53
6,52
6,51
6,50
6,49
www.DataSheet4U.com6,48
6,47
6,46
6,45
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 29 Trimmed Reference VREF vs. Tj
21,8
21,7
21,6
21,5
ICE2ASO1
ICE2ASO1G
21,4
21,3
21,2
21,1
21,0
20,9
20,8
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 32 Reduced Osc. Frequency fOSC2 vs. Tj
102,0
101,5
101,0
100,5
ICE2ASO1
ICE2ASO1G
100,0
99,5
99,0
98,5
98,0
97,5
97,0
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 30 Oscillator Frequency fOSC1 vs. Tj
21,0
20,8
20,6
20,4
20,2
ICE2BSO1
ICE2BSO1G
20,0
19,8
19,6
19,4
19,2
19,0
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 33 Reduced Osc. Frequency fOSC4 vs. Tj
70,0
69,5
69,0
68,5
68,0
67,5
67,0
66,5
66,0
65,5
65,0
64,5
64,0
-25 -15 -5
ICE2BSO1
ICE2BSO1G
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 31 Oscillator Frequency fOSC3 vs. Tj
4,70
4,68
4,66
4,64
4,62
ICE2ASO1
ICE2ASO1G
4,60
4,58
4,56
4,54
4,52
4,50
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 34 Frequency Ratio fOSC1 / fOSC2 vs. Tj
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Typical Performance Characteristics
3,45
3,43
3,41
3,39
3,37
3,35
3,33
ICE2BSO1
ICE2BSO1G
w w w . D a t a S h e e t 4 U 3.,c31o m
3,29
3,27
3,25
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 35 Frequency Ratio fOSC3 / fOSC4 vs. Tj
0,730
0,728
0,726
0,724
0,722
0,720
0,718
0,716
0,714
0,712
0,710
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 36 Max. Duty Cycle vs. Tj
3,70
3,69
3,68
3,67
3,66
3,65
3,64
3,63
3,62
3,61
3,60
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 37 PWM-OP Gain AV vs. Tj
4,00
3,95
3,90
3,85
3,80
3,75
3,70
3,65
3,60
3,55
3,50
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 38 Feedback Resistance RFB vs. Tj
58
56
54
52
50
48
46
44
42
40
-25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 39 Soft-Start Resistance RSoft-Start vs. Tj
4,85
4,84
4,83
4,82
4,81
4,80
4,79
4,78
4,77
4,76
4,75
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 40 Detection Limit VFB2 vs. Tj
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Typical Performance Characteristics
5,35
5,34
5,33
5,32
5,31
5,30
5,29
www.DataSheet4U.com5,28
5,27
5,26
5,25
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 41 Detection Limit VSoft-Start1 vs. Tj
4,05
4,04
4,03
4,02
4,01
4,00
3,99
3,98
3,97
3,96
3,95
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 42 Detection Limit VSoft-Start2 vs. Tj
16,80
16,75
16,70
16,65
16,60
16,55
16,50
16,45
16,40
16,35
16,30
16,25
16,20
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 43 Overvoltage Detection Limit VVCC1 vs. Tj
1,010
1,008
1,006
1,004
1,002
1,000
0,998
0,996
0,994
0,992
0,990
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 44 Peak Current Limitation Vcsth vs. Tj
280
270
260
250
240
230
220
210
200
190
180
-25 -15 -5
5 15 25 35 45 55 65 75 85 95 105 115 125
Junction Temperature [°C]
Figure 45 Leading Edge Blanking VVCC1 vs. Tj
Datasheet
Preliminary Data
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Outline Dimension
6 Outline Dimension
P-DSO-8-3
(Plastic Dual Small
Outline)
www.DataSheet4U.com
Figure 46
P-DIP-8-4
(Plastic Dual In-line
Package)
Figure 47
Dimensions in mm
Datasheet
Preliminary Data
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Total Quality Management
Qualität hat für uns eine umfassende
Bedeutung. Wir wollen allen Ihren
www.DataSheet4AUn.csopmrüchen in der bestmöglichen
Weise gerecht werden. Es geht uns also
nicht nur um die Produktqualität
unsere Anstrengungen gelten
gleichermaßen der Lieferqualität und
Logistik, dem Service und Support
sowie allen sonstigen Beratungs- und
Betreuungsleistungen.
Dazu gehört eine bestimmte
Geisteshaltung unserer Mitarbeiter.
Total Quality im Denken und Handeln
gegenüber Kollegen, Lieferanten und
Ihnen, unserem Kunden. Unsere
Leitlinie ist jede Aufgabe mit Null
Fehlernzu lösen in offener
Sichtweise auch über den eigenen
Arbeitsplatz hinaus und uns ständig
zu verbessern.
Unternehmensweit orientieren wir uns
dabei auch an top(Time Optimized
Processes), um Ihnen durch größere
Schnelligkeit den entscheidenden
Wettbewerbsvorsprung zu verschaffen.
Geben Sie uns die Chance, hohe
Leistung durch umfassende Qualität zu
beweisen.
Wir werden Sie überzeugen.
Quality takes on an allencompassing
significance at Semiconductor Group.
For us it means living up to each and
every one of your demands in the best
possible way. So we are not only
concerned with product quality. We
direct our efforts equally at quality of
supply and logistics, service and
support, as well as all the other ways in
which we advise and attend to you.
Part of this is the very special attitude of
our staff. Total Quality in thought and
deed, towards co-workers, suppliers
and you, our customer. Our guideline is
do everything with zero defects, in an
open manner that is demonstrated
beyond your immediate workplace, and
to constantly improve.
Throughout the corporation we also
think in terms of Time Optimized
Processes (top), greater speed on our
part to give you that decisive
competitive edge.
Give us the chance to prove the best of
performance through the best of quality
you will be convinced.
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