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Número de pieza

componentes Descripción

Fabricante

NCP1379

QUASI−RESONANT PWM CONTROLLER FOR HIGH POWER AC−DC WALL ADAPTERS

ON Semiconductor 

NCP1379

TYPICAL APPLICATION EXAMPLE

HV −bulk

NCP 1 3 7 9

ZCD / OPP 1

8

2

7

3

6

4

5

..

.

VCC

GND

Vout

GND

Figure 1. Typical Application Schematic

PIN FUNCTION DESCRIPTION

Pin N5

Pin Name

Function

1

ZCD

Zero Crossing Detection

Adjust the over power protection

2

FB

3

CS

4

GND

5

DRV

6

VCC

7

Fault

8

CT

Feedback pin

Current sense

−

Driver output

Supplies the controller

Overvoltage protection

Brown−out

Timing capacitor

Pin Description

Connected to the auxiliary winding, this pin detects the core reset

event.

Also, injecting a negative voltage smaller than 0.3 V on this pin will

perform over power protection.

Hooking an optocoupler collector to this pin will allow regulation.

This pin monitors the primary peak.

The controller ground

The driver’s output to an external MOSFET

This pin is connected to an external auxiliary voltage.

This pin observes the HV rail and protects the circuit in case of low

main conditions. It also offers a way to latch the circuit in case of over

voltage event.

A capacitor connected to this pin acts as the timing capacitor in fold-

back mode.

http://onsemi.com

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