VIPER22A Datasheet PDF | STMicroelectronics

STMicroelectronics VIPER22A

The VIPer22A combines a dedicated current mode PWM controller with a high voltage Power BLOCK DIAGRAM SO-8 DIP-8 PACKAGE SO-8 DIP-8 ORDER CODES TUBE T&R VIPer22AS VIPer22AS13TR VIPer22ADIP - MOSFET on the same silicon chip. 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.

Part No.	VIPER22A
Datasheet	VIPER22A Download
Manufacturer	STMicroelectronics
Description	LOW POWER OFF LINE SMPS PRIMARY SWITCHER
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DESCRIPTION

Typical applications cover off line power supplies for battery charger adapters, standby power supplies for TV or monitors, auxiliary supplies for motor control, etc. – Automatic burst mode in low load condition. – 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 September 2002 1/15 VIPer22ADIP / VIPer22AS PIN FUNCTION Name Function Power supply of the control circuits. Also provides a charging current during start up thanks to a high voltage current source connected to the drain. For this purpose, an hysteresis comparator monitors the VDD voltage and provides two thresholds: VDD - VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns off the start up current source. - VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on the start up current source.