NCP1200

http://onsemi.com

2

6.5 V @ 600 mA

D2

1N5819

C5

10

mF

+

C3

10

mF

400 V

+

EMI

Filter

Adj

FB

CS

GND

C2

470

mF/10 V

Rf

470

Drv

NC

HV

1

2

3

4

8

7

6

5

Universal Input

M1

MTD1N60E

D8

5 V1

+

Figure 1. Typical Application

*

*Please refer to the application information section

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Function

Description

1

Adj

Adjust the Skipping Peak Current

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

place.

2

FB

Sets the Peak Current Setpoint

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

justed accordingly to the output power demand.

3

CS

Current Sense Input

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

via an L.E.B.

4

GND

The IC Ground

5

Drv

Driving Pulses

The driver’s output to an external MOSFET.

6

Supplies the IC

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

mF.

7

NC

No Connection

This un−connected pin ensures adequate creepage distance.

8

HV

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