LD7535A (Leadtrend Technology)
Green-Mode PWM Controller

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LD7535/LD7535A
12/11/2007
Green-Mode PWM Controller with Integrated Protections
Rev. 01c
General Description
The LD7535/LD7535A are low cost, low startup current,
current mode PWM controllers with green-mode power-
saving operation. The integrated functions include the
leading-edge blanking of the current sensing, internal slope
compensation and the tiny package of SOT-26. They
provide the users a superior AC/DC power application of
higher efficiency, low external component counts, and lower
cost solution.
Furthermore, LD7535/LD7535A features more protections
like OLP (Over Load Protection) and OVP (Over Voltage
Protection) to eliminate the external protection circuits. And
to satisfy different designs, 2 versions of OVP levels are
implemented as ---
z LD7535 --- 28.0V ± 1.5V.
z LD7535A --- 21.0V ± 1.5V.
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<20μA)
z Current Mode Control
z Non-audible-noise Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Programmable Switching Frequency
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z OLP (Over Load Protection)
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
Typical Application
1
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Green-Mode PWM Controller

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Pin Configuration (LD7535)
DIP-8 (TOP VIEW)
LD7535/LD7535A
SOT-26 (TOP VIEW)
8 765
TOP MARK
YYWW##
65
Y WP 35
12
4
3
1 234
Y The PB free package is identified
in embossed font while green
package in regular font.
YY, Y : Year code (D: 2004, E: 2005…..)
WW, W: Week code
P : LD75..
(Product family code)
## : Production code
Pin Configuration (LD7535A)
DIP-8 (TOP VIEW)
SOT-26 (TOP VIEW)
8 765
TOP MARK
YYWW##
654
Y WP 35A
1 23
1 234
Y The PB free package is identified
in embossed font while green
package in regular font.
YY, Y : Year code (D: 2004, E: 2005…..)
WW, W: Week code
P : LD75..
(Product family code)
## : Production code
Ordering Information
Part number
Package
TOP MARK
LD7535 BL
SOT-26 PB Free
YWP/35
LD7535 GL SOT-26 Green Package
YWP/35
LD7535 BN DIP-8
PB Free
LD7535BN
LD7535A BL SOT-26 PB Free
YWP/35A
LD7535A GL SOT-26 Green Package
YWP/35A
LD7535A BN DIP-8
PB Free
LD7535ABN
The LD7535/ LD7535A are ROHS Complaint/ Green Package.
Shipping
3000 /tape & reel
3000 /tape & reel
3600 /tube /Carton
3000 /tape & reel
3000 /tape & reel
3600 /tube /Carton
2
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Green-Mode PWM Controller

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LD7535/LD7535A
Pin Descriptions
PIN NAME
FUNCTION
1 GND Ground
Voltage feedback pin (same as the COMP pin in UC384X), By connecting
2 COMP
a photo-coupler to close the control loop and achieve the regulation.
This pin is to program the switching frequency. By connecting a resistor
3 RT
to ground to set the switching frequency.
4 CS Current sense pin, connect to sense the MOSFET current
5 VCC Supply voltage pin
6 OUT Gate drive output to drive the external MOSFET
3
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LD7535A (Leadtrend Technology)
Green-Mode PWM Controller

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Block Diagram
LD7535/LD7535A
* Note: OLP delay is 60mS when the switching frequency is set as 65KHz.
The OLP delay time is proportional to the period of switching cycle.
That is,
TOLP _ delay
Ts
=
1
fs
.
4
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Green-Mode PWM Controller

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Absolute Maximum Ratings
Supply Voltage VCC
COMP, RT, CS
Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Package Thermal Resistance (SOT-26)
Package Thermal Resistance (DIP-8)
Power Dissipation (SOT-26, at Ambient Temperature = 85°C)
Power Dissipation (DIP-8, at Ambient Temperature = 85°C)
Lead temperature (Soldering, 10sec)
ESD Voltage Protection, Human Body Model
ESD Voltage Protection, Machine Model
Gate Output Current
LD7535/LD7535A
30V
-0.3 ~7V
150°C
-40°C to 85°C
-65°C to 150°C
250°C/W
100°C/W
250mW
650mW
260°C
3KV
250V
300mA
Caution:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied.
Recommended Operating Conditions
Item
Supply Voltage Vcc (LD7535)
Supply Voltage Vcc (LD7535A)
Switching Frequency
Startup Resistor Value
Min.
11
11
50
1.2
Max.
25
18
130
4.4
Unit
V
V
KHz
MΩ
5
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Green-Mode PWM Controller

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LD7535/LD7535A
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
Supply Voltage (Vcc Pin)
Startup Current
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V
Protection tripped (OLP, OVP)
UVLO (off)
UVLO (on)
OVP Level
LD7535
LD7535A
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
Green Mode Threshold VCOMP
VCOMP=0V
COMP pin open
Current Sensing (CS Pin)
Maximum Input Voltage, Vcs(off)
Leading Edge Blanking Time
Input impedance
Delay to Output
Oscillator (RT pin)
Frequency
Green Mode Frequency
Temp. Stability
Voltage Stability
RT=100KΩ
Fs=65KHz
(-40°C ~105°C)
(VCC=11V-25V)
Gate Drive Output (OUT Pin)
Output Low Level
Output High Level
Rising Time
Falling Time
VCC=15V, Io=20mA
VCC=15V, Io=20mA
Load Capacitance=1000pF
Load Capacitance=1000pF
OLP (Over Load Protection)
OLP Trip Level
OLP Delay Time (note)
VCOMP(OLP)
Fs=65KHz
MIN
TYP
MAX UNITS
8 20 μA
2.0 3.0 mA
2.5 mA
0.5 mA
9.0
10.0
11.0
V
15.0
16.0
17.0
V
26.5
28.0
29.5
V
19.5
21.0
22.5
V
1.5
6.0
2.35
2.2 mA
V
V
0.80
0.85
0.90
V
350 nS
1 MΩ
100 nS
60 65 70 KHz
20 KHz
3%
1%
1V
8V
50 200 nS
30 100 nS
5.0 V
60 mS
Note: The OLP delay time is proportional to the period of switching cycle. So that, the lower RT value will set the higher switching
frequency and the shorter OLP delay time.
6
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Green-Mode PWM Controller

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LD7535/LD7535A
Typical Performance Characteristics
18.0
17.2
16.4
15.6
14.8
14.0 -40
0
Fig. 1
40 80
Temperature (°C)
UVLO (on) vs. Temperature
120 125
12
11.2
10.4
9.6
8.8
8
-40
0
Fig. 2
40 80
Temperature (°C)
UVLO (off ) vs. Temperature
120 125
70
68
66
64
62
60-40
0 40 80
Temperature (°C)
Fig. 3 Frequency vs. Temperature
120 125
26
24
22
20
18
16
-40
Fig. 4
0 40 80 120 125
Temperature (°C)
Green Mode Frequency vs. Temperature
70
68
66
64
62
60
11 12
14 16 18 20 22
Vcc (V)
Fig. 5 Frequency vs. Vcc
24 25
25
23
21
19
17
15
11 12
14 16 18 20 22 24 25
Vcc (V)
Fig. 6 Green Mode Frequency vs. Vcc
7
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Green-Mode PWM Controller

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85
80
75
70
65
60
-40
0
Fig. 7
40 80
Temperature (°C)
Max Duty vs. Temperature
120 125
12
10
8
6
4
2
0
-40
Fig. 9
0 40 80
Temperature (°C)
120 125
Startup Current (Istartup) vs. Temperature
7.0
6.5
6.0
5.5
5.0
4.5
-40 0 40 80 120 125
Temperature (°C)
Fig. 11 VCOMP open loop voltage vs. Temperature
LD7535/LD7535A
0.90
0.88
0.86
0.84
0.82
0.80-40
35
30
25
20
15
10
-40
0 40 80
Temperature (°C)
Fig. 8 VCS (off) vs. Temperature
120 125
LD7535
LD7535A
0 40 80
Temperature (°C)
Fig. 10 VCC OVP vs. Temperature
120 125
6.0
5.5
5.0
4.5
4.0
3.5
-40
0 40 80 120 125
Temperature (°C)
Fig. 12 OLP-Trip Level vs. Temperature
8
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LD7535A (Leadtrend Technology)
Green-Mode PWM Controller

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LD7535/LD7535A
Application Information
Operation Overview
The LD7535/LD7535A meet the green-power requirement
and are intended for the use in those modern switching
power suppliers and adaptors which demand higher power
efficiency and power-saving. They integrated more functions
to reduce the external component counts and the size. Their
major features are described as below.
Under Voltage Lockout (UVLO)
An UVLO comparator is implemented in it to detect the
voltage on the VCC pin. It would assure the supply voltage
enough to turn on the LD7535/LD7535A PWM controller
and further to drive the power MOSFET. As shown in Fig.
13, a hysteresis is built in to prevent the shutdown from the
voltage dip during startup. The turn-on and turn-off
threshold level are set at 16.0V and 10.0V, respectively.
PWM controller will help to increase the value of R1 and
then reduce the power consumption on R1. By using CMOS
process and the special circuit design, the maximum startup
current of LD7535/LD7535A is only 20μA.
If a higher resistance value of the R1 is chosen, it usually
takes more time to start up. To carefully select the value of
R1 and C1 will optimize the power consumption and startup
time.
Vcc
UVLO(on)
UVLO(off)
I(Vcc)
t
operating current
(~ mA)
Fig. 14
Current Sensing and Leading-edge Blanking
startup current
(~uA)
Fig. 13
t
Startup Current and Startup Circuit
The typical startup circuit to generate the LD7535/LD7535A
Vcc is shown in Fig. 14. During the startup transient, the
Vcc is lower than the UVLO threshold thus there is no gate
pulse produced from LD7535/LD7535A to drive power
MOSFET. Therefore, the current through R1 will provide
the startup current and to charge the capacitor C1.
Whenever the Vcc voltage is high enough to turn on the
LD7535/LD7535A and further to deliver the gate drive signal,
the supply current is provided from the auxiliary winding of
the transformer. Lower startup current requirement on the
The typical current mode of PWM controller feedbacks both
current signal and voltage signal to close the control loop
and achieve regulation. As shown in Fig. 15, the
LD7535/LD7535A detect the primary MOSFET current from
the CS pin, which is not only for the peak current mode
control but also for the pulse-by-pulse current limit. The
maximum voltage threshold of the current sensing pin is set
at 0.85V. From above, the MOSFET peak current can be
obtained from below.
IPEAK(MAX)
=
0.85V
RS
9
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Green-Mode PWM Controller

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LD7535/LD7535A
Fig. 15
A 350nS leading-edge blanking (LEB) time is included in the
input of CS pin to prevent the false-trigger from the current
spike. In the low power application, if the total pulse width of
the turn-on spikes is less than 350nS and the negative spike
on the CS pin doesn’t exceed -0.3V, it could eliminated the
R-C filter (as shown in the figure16).
However, the total pulse width of the turn-on spike is
decided by the output power, circuit design and PCB layout.
It is strongly recommended to adopt a smaller R-C filter (as
shown in figure 17) for higher power application to avoid the
CS pin being damaged by the negative turn-on spike.
Fig. 16
Output Stage and Maximum Duty-Cycle
An output stage of a CMOS buffer, with typical 300mA
driving capability, is incorporated to drive a power MOSFET
directly. And the maximum duty-cycle of LD7535/LD7535A
is limited to 75% to avoid the transformer saturation.
Oscillator and Switching Frequency
Connect a resistor from RT pin to GND according to the
equation below to program the normal switching frequency:
fSW
=
65.0
RT(KΩ)
× 100(KHz)
Fig. 17
The operating frequency range for the LD7535/LD7535A is
recommended to set between 50KHz and 130KHz.
Voltage Feedback Loop
The voltage feedback signal is provided from the TL431 at
the secondary side through the photo-coupler to the COMP
pin of the LD7535/LD7535A. Similar to UC3842, the
LD7535/LD7535A would carry 2 diodes voltage offset at the
stage to feed the voltage divider at the ratio of 1/3, that is,
10
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Green-Mode PWM Controller

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LD7535/LD7535A
V(PWMCOMPARATOR )
=
1
3
×
(
VCOMP
2VF )
A pull-high resistor is embedded internally and can be
eliminated externally.
Internal Slope Compensation
In the conventional application, the problem of the stability is
a critical issue for current mode controlling, when it operates
in higher than 50% of the duty-cycle. As UC384X, It takes
slope compensation from injecting the ramp signal of the
RT/CT pin through a coupling capacitor. It therefore requires
no extra design for the LD7535/LD7535A since it has
integrated it already.
The Vcc OVP function in LD7535/LD7535A is an
auto-recovery type protection. If the OVP condition,
usually caused by the feedback loop opened, is not
released, the Vcc will tripped the OVP level again and
re-shutdown the output. The Vcc is working as a hiccup
mode. The Figure. 18 shows its operation.
On the other hand, if the OVP condition is removed, the Vcc
level will get back to normal level and the output will
automatically return to the normal operation.
On/Off Control
The LD7535/LD7535A can be turned off by pulling COMP
pin lower than 1.2V. The gate output pin of the
LD7535/LD7535A will be disabled immediately under such
condition. The off-mode can be released when the pull-low
signal is removed.
Dual-Oscillator Green-Mode Operation
There are many different topologies has been implemented
in different chips for the green-mode or power saving
requirements such as “burst-mode control”, “skipping-cycle
mode”, “variable off-time control “…etc. The basic operation
theory of all these approaches intended to reduce the
switching cycles under light-load or no-load condition either
by skipping some switching pulses or reduce the switching
frequency.
By using this dual-oscillator control, the green-mode
frequency can be well controlled and further to avoid the
generation of audible noise.
OVP (Over Voltage Protection) on Vcc
The VGS ratings of the nowadays power MOSFETs are often
limited up to max. 30V. To prevent the VGS from the fault
condition, LD7535/LD7535A are implemented an OVP
function on Vcc. Whenever the Vcc voltage is higher than
the OVP threshold voltage, the output gate drive circuit will
be shutdown simultaneously thus to stop the switching of
the power MOSFET until the next UVLO(on).
Fig. 18
The OVP levels are ---
z LD7535 --- 28.0V ± 1.5V.
z LD7535A --- 21.0V ± 1.5V.
Over Load Protection (OLP)
To protect the circuit from being damaged under over load
condition or short condition, a smart OLP function is
implemented in the LD7535/LD7535A. The figure 20 shows
the waveforms of the OLP operation. In this case, the
feedback system will force the voltage loop proceed toward
the saturation and then pull up the voltage on COMP pin
(VCOMP). Whenever the VCOMP trips up to the OLP threshold
5V and stays longer than 60mS, the protection will activate
and then turn off the gate output to stop the switching of
power circuit. The 60mS delay time is to prevent the false
trigger from the power-on and turn-off transient.
By such protection mechanism, the average input power
can be reduced to very low level so that the component
temperature and stress can be controlled within the safe
operating area.
11
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Green-Mode PWM Controller

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VCC
UVLO(on)
UVLO(off)
COMP
5.0V
OUT
OLP
UVLO(off)
OLP Reset
60mS
OLP trip Level
LD7535/LD7535A
Under the conditions listed below, the gate output will turn
off immediately to protect the power circuit ---
y RT pin short to ground
y RT pin floating
y CS pin floating
t
t
Switching
Non-Switching
Fig. 19
Switching
t
Fault Protection
There are several critical protections were integrated in the
LD7535/LD7535A to prevent the power supply or adapter
from being damaged. Those damages usually come from
open or short condition on the pins of LD7535/LD7535A.
12
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Green-Mode PWM Controller

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LD7535/LD7535A
Reference Application Circuit --- 10W (5V/2A) Adapter
Schematic
13
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LD7535/LD7535A
Reference Application Circuit --- 10W (5V/2A) Adapter
BOM
P/N
R1A
R1B
R2A
R2B
R4A
R4B
R6
R7
R8
RS1
RS2
RT
R51A
R51B
R52
R53
R54
R55
R56A
R56B
NTC1
FL1
T1
L51
Component Value
N/A
N/A
750KΩ, 1206
750KΩ, 1206
39KΩ, 1206
39KΩ, 1206
10Ω, 1206
10Ω, 1206
10KΩ, 1206
2.70Ω, 1206, 1%
2.70Ω, 1206, 1%
100KΩ, 0805, 1%
100Ω, 1206
100Ω, 1206
2.49KΩ, 0805, 1%
2.49KΩ, 0805, 1%
220Ω, 0805
10KΩ, 0805
510Ω, 1206
N/A
08SP005
20mH
EI-22
2.7μH
Original
UU9.8
P/N
C1
C2
C4
C5
C51
C52
C54
C55
CX1
CY1
D1A
D1B
D1C
D1D
D2
D4
Q1
CR51
ZD51
IC1
IC2
IC51
F1
Z1
Component Value
22μF, 400V
10μF, 50V
1000pF, 1000V, 1206
0.01μF, 16V, 0805
1000pF, 50V, 0805
1000μF, 10V
470μF, 10V
0.01μF, 16V, 0805
0.1μF
2200pF
1N4007
1N4007
1N4007
1N4007
PS102R
1N4007
2N60B
SB540
6V2C
LD7535/LD7535A BL
EL817B
TL431
250V, 1A
N/A
Note
L-tec
Holystone
L-tec
L-tec
X-cap
Y-cap
600V/2A
SOT-26
1%
14
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LD7535/LD7535A
Reference Application Circuit #2 --- 10W Adapter with 2-Stage Startup Circuit
Pin < 0.25W when Pout = 0W
2-stage Startup
Circuit
15
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LD7535/LD7535A
Reference Application Circuit #2 --- 10W Adapter with 2-Stage Startup Circuit
BOM
P/N
R1A
R1B
R2A
R2B
R4A
R4B
R6
R7
R8
RS1
RS2
RT
R51A
R51B
R52
R53
R54
R55
R56A
R56B
NTC1
FL1
T1
L51
Component Value
N/A
N/A
2.2MΩ, 1206
2.2MΩ, 1206
39KΩ, 1206
39KΩ, 1206
2.2Ω, 1206
10Ω, 1206
10KΩ, 1206
2.70Ω, 1206, 1%
2.70Ω, 1206, 1%
100KΩ, 0805, 1%
100Ω, 1206
100Ω, 1206
2.49KΩ, 0805, 1%
2.49KΩ, 0805, 1%
220Ω, 0805
10KΩ, 0805
1KΩ, 1206
N/A
5Ω, 3A
20mH
EI-22
2.7μH
Original
08SP005
UU9.8
P/N
C1
C2
C3
C4
C5
C51
C52
C54
C55
CX1
CY1
D1A
D1B
D1C
D1D
D2
D3
D4
Q1
CR51
ZD51
IC1
IC2
IC51
F1
Z1
Component Value
22μF, 400V
10μF, 50V
2.2μF, 50V
1000pF, 1000V, 1206
0.01μF, 16V, 0805
1000pF, 50V, 0805
1000μF, 10V
470μF, 10V
0.01μF, 16V, 0805
0.1μF
2200pF
1N4007
1N4007
1N4007
1N4007
PS102R
1N4148
1N4007
2N60B
SB540
6V2C
LD7535/LD7535A IL
EL817B
TL431
250V, 1A
N/A
L-tec
L-tec
Note
Holystone
L-tec
L-tec
X-cap
Y-cap
600V/2A
SOT-26
1%
16
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Package Information
SOT-26
LD7535/LD7535A
Symbol
A
B
C
D
F
H
I
J
M
θ
Dimension in Millimeters
Min Max
2.692
3.099
1.397
1.803
-------
1.450
0.300
0.550
0.838
1.041
0.080
0.254
0.050
0.150
2.600
3.000
0.300
0.600
0° 10°
Dimensions in Inches
Min Max
0.106
0.122
0.055
0.071
-------
0.058
0.012
0.022
0.033
0.041
0.003
0.010
0.002
0.006
0.102
0.118
0.012
0.024
0° 10°
17
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7535&LD7535A-DS-01c December 2007


LD7535A (Leadtrend Technology)
Green-Mode PWM Controller

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Package Information
DIP-8
LD7535/LD7535A
Symbol
A
B
C
D
E
F
I
J
L
Dimension in Millimeters
Min Max
9.017
10.160
6.096
7.112
----- 5.334
0.356
0.584
1.143
1.778
2.337
2.743
2.921
3.556
7.366
8.255
0.381
------
Dimensions in Inches
Min Max
0.355
0.400
0.240
0.280
------
0.210
0.014
0.023
0.045
0.070
0.092
0.108
0.115
0.140
0.290
0.325
0.015
--------
Important Notice
Leadtrend Technology Corp. reserves the right to make changes or corrections to its products at any time without notice. Customers should
verify the datasheets are current and complete before placing order.
18
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7535&LD7535A-DS-01c December 2007


LD7535A (Leadtrend Technology)
Green-Mode PWM Controller

No Preview Available !

Click to Download PDF File for PC

LD7535/LD7535A
Revision History
Rev. Date
00 03/01/’06
01 01/11/07
01a 5/17/07
01b 11/29/07
01c 12/11/07
Change Notice
Renew from the LD7535 spec. (Rev=0) by adding the LD7535A related descriptions and
data. The revision number is reset from 0.
Revision: Block Diagram and Characteristic
Revision: Marking description
Revision: green package option
Revision: Block Diagram/ LD7535A OVP
19
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7535&LD7535A-DS-01c December 2007




LD7535A.pdf
Click to Download PDF File