VIPER22A Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

VIPER22A

LOW POWER OFF LINE SMPS PRIMARY SWITCHER

STMicroelectronics 

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.

SOURCE Power MOSFET source and circuit ground reference.

Power MOSFET drain. Also used by the internal high voltage current source during start up phase for

DRAIN charging the external VDD capacitor.

Feedback input. The useful voltage range extends from 0V to 1V, and defines the peak drain MOSFET

FB

current. The current limitation, which corresponds to the maximum drain current, is obtained for a FB pin

shorted to the SOURCE pin.

CURRENT AND VOLTAGE CONVENTIONS

I DD

ID

VDD

IFB

DRAIN

FB

CONTROL

VDD

VD

VFB

VIPer22A

SOURCE

CONNECTION DIAGRAM

SOURCE 1

SOURCE 2

FB 3

VDD 4

8 DRAIN

7 DRAIN

6 DRAIN

5 DRAIN

SO-8

SOURCE 1

SOURCE 2

FB 3

VDD 4

8 DRAIN

7 DRAIN

6 DRAIN

5 DRAIN

DIP8

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