CR6842 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

CR6842

Green-Power PWM Controller with Freq. Jittering

Unspecified 

CR6842

Pin Assignment & Description

1 GND GATE 8

2 FB

VDD 7

3 VIN SENSE 6

4 RI

RT 5

Name

GND

FB

VIN

RI

RT

SENSE

VDD

GATE

GND Pin

Description

Voltage feedback pin. The PWM duty cycle is determined by FB and Sense.

This pin is pulled high to the rectified line input through a large resistor for start-up. This pin is

also used to detect line voltage to compensate for constant output power limit for universal

AC input.

By connecting a resistor to ground to set the switching freq.. Increasing the resistor will

reduce the switching freq..

An NTC resistor is connected from this pin to ground for over-temperature protection.

Current sense pin, The sensed voltage is used for current-mode control and pulse-by-pulse

current limiting.

Power supply voltage pin.

Gate drive output to drive the external MOSFET.A soft driving waveform is implemented

to improve EMI.

Typical Application Circuit

From bridge rectifier

1 GND GATE 8

2 FB

VDD 7

3 VIN SENSE 6

4 RI

RT 5

From auxiliary

winding

Rs

NTC

Dec.2006 V 1.3

2

Chengdu Chip-Rail Tech.Co.,Ltd

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