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AP3710M-E1 Datasheet(PDF) 11 Page - BCD Semiconductor Manufacturing Limited |
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AP3710M-E1 Datasheet(HTML) 11 Page - BCD Semiconductor Manufacturing Limited |
11 / 16 page LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER AP3710 Data Sheet 11 BCD Semiconductor Manufacturing Limited Aug. 2008 Rev. 1. 3 Function Description (Continued) 7. Short Circuit Protection Internal short circuit control can protect a SMPS from being damaged when short circuit at its output happens. 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. Figure 18. Short Circuit Protection Block Discharge Logic Discharge Comparator From UVLO VA V REF 1.2V From VCC |
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