NCP1246B100DR2G データシートの表示（PDF） - ON Semiconductor

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NCP1246B100DR2G

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1246

TYPICAL APPLICATION EXAMPLE

Figure 1. Flyback Converter Application Using the NCP1246

PIN FUNCTION DESCRIPTION

Pin No Pin Name

Function

1

LATCH

LatchïOff Input

2

FB

Feedback + Shutdown pin

3

CS

Current Sense

4

GND

5

DRV

6

VCC

ï

Drive output

VCC input

8

HV

Highïvoltage pin

Pin Description

Pull the pin up or down to latchïoff the controller. An internal current source

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

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.

This Input senses the Primary Current for currentïmode operation, and

offers an overpower compensation adjustment.

The controller ground

Drives external MOSFET

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.

Connects to the rectified AC line to perform the functions of Startïup

Current Source, SelfïSupply, brownïout detection 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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