NCP1200 データシートの表示（PDF） - ON Semiconductor

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NCP1200

PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies

ON Semiconductor 

NCP1200

EMI

Filter

Universal Input

C3 +

10 mF

400 V

*

1 Adj HV 8

2 FB NC 7

3 CS VCC 6

4 GND Drv 5

D2

1N5819

M1

MTD1N60E

6.5 V @ 600 mA

+ C2

470 mF/10 V

Rf

470

C5

10 mF

+

Rsense

D8

5 V1

*Please refer to the application information section

Figure 1. Typical Application

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PIN FUNCTION DESCRIPTION

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Pin No. Pin Name

Function

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1

Adj

Adjust the Skipping Peak Current

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2

FB

Sets the Peak Current Setpoint

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3

CS

Current Sense Input

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4

GND The IC Ground

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5

Drv

Driving Pulses

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6

VCC

Supplies the IC

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 7

NC

No Connection

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 8

HV

Generates the VCC from the Line

Description

This pin lets you adjust the level at which the cycle skipping process takes

place.

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

justed accordingly to the output power demand.

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

via an L.E.B.

The driver’s output to an external MOSFET.

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

This un−connected 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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