DAP041 datasheet(2/40 Pages) ONSEMI

2 / 40 page

SCY99194

http://onsemi.com

TYPICAL APPLICATION EXAMPLE

Figure 1. Flyback Converter Application Using the SCY99194

SCY99194

PIN FUNCTION DESCRIPTION

Pin No

Pin Name

Function

Pin Description

LATCH

Latch−Off Input

Pull the pin up or down to latch−off the controller. An internal current source

allows the direct connection of an NTC for over temperature detection.

Feedback + Shutdown pin

An optocoupler collector to ground controls the output regulation. The part

goes to the low consumption Off mode if the FB input pin is pulled to GND.

Current Sense

This Input senses the Primary Current for current−mode operation, and

offers an overpower compensation adjustment.

GND

−

The controller ground

DRV

Drive output

Drives external MOSFET

VCC

VCC input

This supply pin accepts up to 28 Vdc, with overvoltage detection. The pin is

connected to an external auxiliary voltage. It is not allowed to connect

another circuit to this pin to keep low input power consumption.

High−voltage pin

Connects to the rectified AC line to perform the functions of Start−up

Current Source, Self−Supply and X2 capacitor discharge function and the

HV sensing for the overpower protection purposes. It is not allowed to

connect this pin to DC voltage.

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