- 6 -

WWW.INTERPIONSEMI.COM

IP1521

DUAL OUTPUT VOLTAGE SERIES REGULATOR

APPLICATION SUMMARY

- ON / OFF

When you want to control output of the IP1521, use pin #4 as follows

Pin#4

IP1521

HIGH

off

LOW

on

on/off function

As shown in figure

Pin#4 is positive input of the comparator,

and the other Input is threshold voltage.

If the voltage of the pin#4 rises above threshold voltage,

then TR Q1 will be saturated and the main bias current

will be shut down.

Pin#4

Vth

Main

bias

Q1