NCP1207A 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1207A

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

ON Semiconductor 

Universal Network

NCP1207A, NCP1207B

*

+ OVP and NCP1207A/B

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 Pin 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 This pin senses the primary current and routes it to the internal comparator via an

cycle level selection

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. (No pin on

NCP1207B)

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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