MP8007 ― IEEE 802.3AF PD WITH 13W FLYBACK / BUCK CONVERTER

MP8007 Rev.1.0

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19

6/27/2016

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In buck mode, if the voltage at FB2 is higher

than the reference voltage, the DCDC converter

stops switching immediately.

Thermal Shutdown

Thermal shutdown is implemented to prevent

the chip from thermally running away. MP8007

has separated temperature monitor circuit for

PD and switching devices, DC converter

thermal protection won't affect PD interface but

PD temperature protection will turn off both PD

and DC converter. When the temperature is

lower than its recovery threshold, thermal

shutdown is gone and the chip is enabled.