AP3710PTR-E1 查看數據表（PDF） - BCD Semiconductor

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AP3710PTR-E1

LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER

BCD Semiconductor 

Data Sheet

LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER

AP3710

Function Description (Continued)

7. Short Circuit Protection

From

From

Internal short circuit control can protect a SMPS from VCC

UVLO

being damaged when short circuit at its output

Discharge

VA

happens.

Comparator

In Figure 18, when VCC drops below its turn off

threshold value, the UVLO comparator's output will

control the Discharge Logic to pull VA terminal to low

level, and the low level is kept before the VCC voltage

drops below the threshold value of discharge compara-

tor. Then the system will re-startup from C4 charging

again and the same process will repeat indefinitely.

The long start-up period makes the input power low

enough to ensure the whole system in safety under

output short circuit condition.

VREF

1.2V

Discharge

Logic

Figure 18. Short Circuit Protection Block

Aug. 2008 Rev. 1. 3

BCD Semiconductor Manufacturing Limited

11

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