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AP3776B датащи(PDF) 13 Page - Diodes Incorporated |
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AP3776B датащи(HTML) 13 Page - Diodes Incorporated |
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13 / 17 page ![]() AP3776B Document number: DS36737 Rev. 6 - 2 13 of 17 www.diodes.com December 2015 © Diodes Incorporated AP3776B Function Description (Cont.) VTH(ST) VFB(SCP) tOFF(MAX) VCC VFB VOUT VOUT(SCP) 5V Figure 6. Normal Start-up VTH(ST) VOPR(MIN) VFB(SCP) tOFF(MAX) VCC VFB VOUT 0V Figure 7. Short Circuit Protection (SCP) and Hiccup Mode 4. RCS Short Protection When the primary side current sense resistance is shorted, the primary side current rapidly increases, and the transformer saturates, which leads to some components’ damage. The AP3776B draws in the RCS short protection to avoid the damage. If the voltage of CS pin is smaller than 0.15V at the primary side maximum on time tonp(MAX), the RCS short protection is triggered, and the AP3776B immediately shuts down, and then restarts. 5. Over Temperature Protection (OTP) When the IC junction temperature exceeds the thermal shutdown temperature threshold of +130ºC, the device shuts down immediately. Retry is allowed if junction temperature reduces by hysteresis temperature value. |
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