17

Rev C, November 1999

Considering the lightning surge and noise, there are two types of protections. One is a few sec-

onds delay between TPG and PG for safe operation and another is some noise margin of Pin10.

7. ABOUT TEST METHOD

You can verify the KA3511 with a SMPS set. But you should pay attention to the device damage

KA3511 is grounded and then fan stops under the Remote Low.

– OVP function of +3.3V/+5V/+12V

You can test OVP for +3.3V/+5V/+12V by shorting Pin16 and Pin17 to GND.

– UVP function of +3.3V/+5V/+12V

You can simply test UVP for +3.3V/+5V/+12V by shorting Pin16 to GND.

– OVP input threshold voltage for PT

The test condition is remote “Low” and you increase the supply voltage of pin16 using a DC

power supply. When the voltage is over 1.2 x V, main power supply will shutdown. So, you can

measure the shutdown point of main power supply, and that will be a OVP input threshold volt-

age for PT.

– Remote On/Off delay time

You can measure the time difference of remote On/Off and the main power supply output as

toggling the remote On/Off.

– PG delay time

In AC power-on time, secondary outputs are turned on and then after some delay time PG out-

put is triggered from low to high. You can measure the time difference of +5V and PG in turn-on

time.