P.07

All Rights Reserved Copyright (C) SHINDENGEN ELECTRIC MANUFACTURING CO., LTD. 2002

Password Vol.02-06-e MR2000 Series

3-5

Simple Design

The functions described above considerable simplify design of peripheral circuits.

Collector current detect resistor, a maximum ON width setting resistor, and adjustment with three

or four ON timing CRs is sufficient for basic design.

With worldwide input, the F/B pin ON width control is used to add a droop compensation circuit.

This article has introduced the features of an IC module which is both compatible with worldwide

input, and supports burst mode switching under micro-load.

The MR2000 Series is a high-functionality and low-cost IC module developed through a program

of joint research between the Shindengen Semiconductor Division and the Functional Devices

Division. As such, it is optimized for control ICs as well as main switching devices in partial

resonance power supplies. Its characteristics permit high efficiency, low noise, and low cost over

a wide range of markets in such electronic products as TVs, CRT and TFT monitors, STBs, and

DVDs, as well as in a variety of office automation equipment.

Further development in terms of applications, and development of new models to suit market

requirements, is scheduled.

The table below describes the name and the function of each pin.

4

Conclusion

Table 2 Pin Names and Functions

Items in brackets refer to MR2500 Series.

Set ON timing.

The signal from the control coil is set with the CR time constant.

The burst mode is selected by connecting a photocoupler to the Z/C pin.

Controls ON width with pin voltage.

A resistor to set the maximum ON width, and a feedback photocoupler,

are connected to this pin.

GND pin

Supplies power from the control coil.

The AC voltage rectified in the start-up circuit is input directly.

Current is supplied to Vcc only at start-up, and is automatically

decoupled following start-up.

Current detect resistor connected to emitter (source)/OCL pin.

Main switch collector (drain) pin

Pin

number

Pin

name

F/B

GND

Vcc

Vin

Emitter/OCL

Collector

Z/C

Function

7

6

5

4

3

2

1