NCP1247BD100R2G datasheet(2/42 Pages) ONSEMI

Part #	NCP1247BD100R2G

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1247

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TYPICAL APPLICATION EXAMPLE

Figure 1. Flyback Converter Application Using the NCP1247

OPTIONS

Part

Option

Frequency

OCP Fault

VHV(start)

VHV(stop)

NCP1247

A

65 kHz

Latched

111 V

103 V

A

100 kHz

Latched

111 V

103 V

B

65 kHz

Autorecovery

111 V

103 V

B

100 kHz

Autorecovery

111 V

103 V

C

65 kHz

Latched

95 V

87 V

C

100 kHz

Latched

95 V

87 V

D

65 kHz

Autorecovery

95 V

87 V

D

100 kHz

Autorecovery

95 V

87 V

PIN FUNCTION DESCRIPTION

Pin No

Pin Name

Function

Pin Description

1

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.

2

FB

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.

3

CS

Current Sense

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

offers an overpower compensation adjustment.

4

GND

−

The controller ground

5

DRV

Drive output

Drives external MOSFET

6

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.

8

HV

High−voltage pin

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

Current Source, Self−Supply, brown−out 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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NCP1247BD100R2G Datasheet(PDF) 2 Page - ON Semiconductor

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