(PDF) VIPER12A Datasheet PDF | STMicroelectronics





VIPER12A Datasheet PDF

Part Number VIPER12A
Description Low power offline switched-mode power supply primary switcher
Manufacture STMicroelectronics
Total Page 21 Pages
PDF Download Download VIPER12A Datasheet PDF

Features: Datasheet pdf VIPER12A-E Low power offline switched-mo de power supply primary switcher Featu res ■ Fixed 60 kHz switching frequenc y ■ 9 V to 38 V wide range VDD voltag e ■ Current mode control ■ Auxiliar y undervoltage lockout with hysteresis ■ High voltage start-up current sourc e ■ Overtemperature, overcurrent and overvoltage protection with auto-restar t ■ Typical power capability – Euro pean (195 - 265 Vac) 8 W for SO-8, 13 W for DIP-8 – European (85 - 265 Vac) 5 W for SO-8, 8 W for DIP-8 Description The VIPER12A combines a dedicated curr ent mode PWM controller with a high vol tage power MOSFET on the same silicon c hip. Figure 1. Block diagram SO-8 DIP -8 Typical applications cover off line power supplies for battery charger ada pters, standby power supplies for TV or monitors, auxiliary supplies for motor control, etc. The internal control cir cuit offers the following benefits: Lar ge input voltage range on the VDD pin a ccommodates changes in auxiliary supply voltage (This feature is well adapted to .

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VIPER12A datasheet
VIPER12A-E
Low power offline switched-mode power supply primary switcher
Features
Fixed 60 kHz switching frequency
9 V to 38 V wide range VDD voltage
Current mode control
Auxiliary undervoltage lockout with hysteresis
High voltage start-up current source
Overtemperature, overcurrent and overvoltage
protection with auto-restart
Typical power capability
– European (195 - 265 Vac) 8 W for SO-8,
13 W for DIP-8
– European (85 - 265 Vac) 5 W for SO-8,
8 W for DIP-8
Description
The VIPER12A combines a dedicated current
mode PWM controller with a high voltage power
MOSFET on the same silicon chip.
Figure 1. Block diagram
SO-8
DIP-8
Typical applications cover off line power supplies
for battery charger adapters, standby power
supplies for TV or monitors, auxiliary supplies for
motor control, etc.
The internal control circuit offers the following
benefits: Large input voltage range on the VDD pin
accommodates changes in auxiliary supply
voltage (This feature is well adapted to battery
charger adapter configurations), automatic burst
mode in low load condition and overvoltage
protection in HICCUP mode.
DRAIN
REGULATOR
INTERNAL
SUPPLY
VDD
FB
_
8/14.5V +
+
42V _
ON/OFF
60kHz
OSCILLATOR
OVERTEMP.
DETECTOR
S
R1 FF Q
R2 R3 R4
PWM
LATCH
OVERVOLTAGE
R LATCH
S FF Q
BLANKING
+
_ 0.23 V
1 kΩ
230 Ω
SOURCE
December 2010
Doc ID 11977 Rev 2
1/21
www.st.com
21

VIPER12A datasheet
Contents
Contents
VIPER12A-E
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Pin connections and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Rectangular U-I output characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Wide range of VDD voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Feedback pin principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Startup sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Overvoltage threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
11 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 Doc ID 11977 Rev 2




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