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KA3511 Datasheet(PDF) 17 Page - Fairchild Semiconductor |
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KA3511 Datasheet(HTML) 17 Page - Fairchild Semiconductor |
17 / 28 page 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. Noise_Margin_of_TPG = V10(max) – Vth(L) = 2.9V – 0.6V = 2.3V 7. ABOUT TEST METHOD You can verify the KA3511 with a SMPS set. But you should pay attention to the device damage problem by increasing VCC. You should remove the sub-board after +5Vsb drops to 0V and VCC of 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. |
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