1207 データシートの表示（PDF） - ON Semiconductor

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1207

PWM Current-Mode Controller for Free Running Quasi-Resonant Operation

ON Semiconductor 

NCP1207

Universal Network

+ OVP and

NCP1207

Demag

1

8

*

2

7

3

6

4

5

+

Vout

+

GND

*Please refer to the application information section

Figure 1. Typical Application

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PIN FUNCTION DESCRIPTION

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PinNo. PinName

Function

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1

Demag

Core reset detection and OVP

Description

The auxiliary FLYBACK signal ensures discontinuous operation and

offers a fixed overvoltage detection level of 7.2 V.

2

FB

Sets the peak current setpoint By connecting an Optocoupler to this pin, the peak current setpoint is

adjusted accordingly to the output power demand. By bringing this pin

below the internal skip level, device shuts off.

3

CS

Current sense input and

skip cycle level selection

4

GND

The IC ground

5

Drv

Driving pulses

6

VCC

Supplies the IC

7

NC

−

8

HV

High−voltage pin

This pin senses the primary current and routes it to the internal

comparator via an L.E.B. By inserting a resistor in series with the pin, you

control the level at which the skip operation takes place.

−

The driver’s output to an external MOSFET.

This pin is connected to an external bulk capacitor of typically 10 mF.

This unconnected pin ensures adequate creepage distance.

Connected to the high−voltage rail, this pin injects a constant current into

the VCC bulk capacitor.

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