MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

13/41

3.3.2 Super standby mode

Super standby mode is an intermittent oscillation mode that minimizes power losses under micro loads. The

function helps reduce input power.

1) Switching from normal mode or auto burst mode to super standby mode

The IC switches from normal mode or auto burst mode to super standby mode by stopping the external

clamp of the Z/C pin voltage using a signal and by applying 3 V or more per cycle.

In super standby mode, the IC promptly lowers the

Vcc voltage to VCC (sp stby start) to shift seamlessly

from direct control to indirect control.

Standby signal ON (Photocoupler lights up):

Z/C pin voltage clamp



Normal mode or auto burst mode

Standby signal OFF (Photocoupler goes out):

Z/C pin voltage clamp released

 Super standby mode

2) Super standby control

In super standby mode, control shifts from direct control using the F/B pin to indirect control using the

Vcc pin.

Super standby oscillation start VCC voltage: VCC (sp stby start) = 8.7 V (TYP)

Super standby oscillation stop VCC voltage: VCC (sp stby stop) = 9.3 V (TYP)

Control is implemented with a lower voltage than VCC during normal operations. Output voltage is kept

below regulation voltage, thereby bypassing activation of the feedback photocoupler and reducing

power consumption.

Z/C

ID

ｽｰﾊﾟｰ

ｽﾀﾝﾊﾞｲ

VCC

ﾉｰﾏﾙ

ｽｰﾊﾟｰｽﾀﾝﾊﾞｲ

3V

Vout

ｽｰﾊﾟｰｽﾀﾝﾊﾞｲ

切替

ｽｰﾊﾟｰｽﾀﾝﾊﾞｲ

解除

Vcc電圧による間接制御

ﾉｰﾏﾙ

Vcc(sp stby start)=8.7V

Vcc(sp stby stop)=9.3V

6

1

3

Z/C端子

GND端子

スタンバイ信号

（外部信号）

VCC端子

Standby signal

(external signal)

VCC pin

Z/C pin

GND pin

Super standby

start

Super standby

stop

Normal

Super

standby

Indirect control with Vcc

Super standby

Normal