VIPER12ASTR-E datasheet(1/21 Pages) STMICROELECTRONICS

Part #	VIPER12ASTR-E

Description	Low power offline switched-mode power supply primary switcher

PDF	21 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 21 page

December 2010

Doc ID 11977 Rev 2

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21

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.

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.

Figure 1.

Block diagram

DIP-8

SO-8

ON/OFF

0.23 V

DRAIN

SOURCE

VDD

PWM

LATCH

60kHz

OSCILLATOR

BLANKING

+

_

8/14.5V

_

+

FF

S

R1

R4

Q

R3

FB

REGULATOR

INTERNAL

SUPPLY

OVERVOLTAGE

LATCH

OVERTEMP.

DETECTOR

1 k

Ω

42V

_

+

R2

FF

S

R

Q

230

Ω

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