VIPER27 Datasheet PDF - STMicroelectronics


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VIPER27
STMicroelectronics

Part Number VIPER27
Description Off-line high voltage converters
Page 30 Pages

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VIPER27
Off-line high voltage converters
Features
800 V avalanche rugged power section
PWM operation with frequency jittering for low
EMI
Operating frequency:
– 60 kHz for L type
– 115 kHz for H type
Standby power < 50 mW at 265 Vac
Limiting current with adjustable set point
Adjustable and accurate overvoltage
protection
On-board soft-start
Safe auto-restart after a fault condition
Hysteretic thermal shutdown
Application
Auxiliary power supply for consumer and home
equipments
ATX auxiliary power supply
Low / medium power AC-DC adapters
SMPS for set-top boxes, DVD players and
recorders, white goods
SO16 narrow
SO 16
Description
DIP-7
The device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of over-current protection, overvoltage and
overload protections, hysteretic thermal
protection, soft-start and safe auto-restart after
any fault condition removal. Burst mode operation
and device very low consumption help to meet the
standby energy saving regulations.
Advance frequency jittering reduces EMI filter
cost. Brown-out function protects the switch mode
power supply when the rectified input voltage
level is below the normal minimum level specified
for the system. The high voltage start-up circuit is
embedded in the device.
Figure 1. Typical topology
+
DC input high voltage
wide range
-
+
DC Output voltage
-
DRAIN DRAIN
BR
VIPER27
GND VDD CONT FB
Table 1. Device summary
Order codes
VIPER27LN / VIPER27HN
VIPER27HD / VIPER27LD
VIPER27HDTR / VIPER27LDTR
July 2010
Package
DIP-7
SO16 narrow
Doc ID 15133 Rev 5
Packaging
Tube
Tape and reel
1/31
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31
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Contents
Contents
VIPER27
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Operation descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3 Power-up and soft-start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.4 Power down operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.5 Auto restart operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.6 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.7 Current mode conversion with adjustable current limit set point . . . . . . . 18
7.8 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.9 About CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.10 Feed-back and overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 23
7.12 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.13 2nd level over current protection and hiccup mode . . . . . . . . . . . . . . . . . 25
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2/31 Doc ID 15133 Rev 5



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VIPER27
1 Block diagram
Block diagram
Figure 2. Block diagram
BR
VVVDDDcDc
DRAIN
CONT
15uA
OVP
LOGIC
OVP
+
-
VBRth
SOFT
START
.
Vin_OK
OCP
BLOCK
6uA
Internal Supply bus
&
Ref erence Voltages
OCP
+ PWM
-
SUPPLY
& UVLO
HV_ON
IDDch
UVLO
OSCILLATOR
BURST TURN-ON
LOGIC
THERMAL
SHUTDOWN
OTP
S
Q
LEB R1 R2
+
-
Ref
2nd OCP
LOGIC
OLP OVP OTP
BURST-MODE
LOGIC
BURST
Rsense
FB GND
2 Typical power
Table 2. Typical power
Part number
230 VAC
Adapter(1)
Open frame(2)
85-265 VAC
Adapter(1)
Open frame(2)
VIPER27
18 W
20 W
10 W
12 W
1. Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient.
2. Maximum practical continuous power in an open frame design at 50 °C ambient, with adequate heat sinking.
Doc ID 15133 Rev 5
3/31



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Pin settings
3 Pin settings
Figure 3. Connection diagram (top view)
VIPER27
Note:
The copper area for heat dissipation has to be designed under the DRAIN pins.
Table 3. Pin description
Pin n.
Name
DIP7 SO16N
Function
1
1...2
GND
This pin represents the device ground and the source of the power
section.
-
4
N.A.
Not available for user. It can be connected to GND (pins 1-2) or left not
connected.
2
5
VDD
Supply voltage of the control section. This pin also provides the charging
current of the external capacitor during start-up time.
Control pin. The following functions can be selected:
1. current limit set point adjustment. The internal set default value of the
cycle-by-cycle current limit can be reduced by connecting to ground an
3 6 CONT external resistor.
2. output voltage monitoring. A voltage exceeding VOVP threshold (see
Table 8 on page 7) shuts the IC down reducing the device consumption.
This function is strobed and digitally filtered for high noise immunity.
Control input for duty cycle control. Internal current generator provides
4
7
FB
bias current for loop regulation. A voltage below the threshold VFBbm
activates the burst-mode operation. A level close to the threshold VFBlin
means that we are approaching the cycle-by-cycle over-current set point.
Brownout protection input with hysteresis. A voltage below the threshold
5
8
BR
VBRth shuts down (not latch) the device and lowers the power
consumption. Device operation restarts as the voltage exceeds the
threshold VBRth + VBRhyst. It can be connected to ground when not used.
High voltage drain pin. The built-in high voltage switched start-up bias
7,8 13...16 DRAIN current is drawn from this pin too.
Pins connected to the metal frame to facilitate heat dissipation.
4/31 Doc ID 15133 Rev 5




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