NCP1207A(2004) 查看數據表（PDF） - ON Semiconductor

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NCP1207A
(Rev.:2004)

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

ON Semiconductor 

Universal Network

NCP1207A

*

+ OVP and NCP1207A

Demag

1

8

2

7

3

6

4

5

+

Vout

+

Gnd

*Please refer to the application information section

Figure 1. Typical Application

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1

Demag

Core reset detection and OVP 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

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

cycle level selection

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.

4

Gnd

The IC ground

−

5

Drv

Driving pulses

The driver’s output to an external MOSFET.

6

VCC

Supplies the IC

7

NC

−

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

This unconnected pin ensures adequate creepage distance.

8

HV

High−voltage pin

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

the VCC bulk capacitor.

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