Insulated synchronous rectification DC/DC converter including a protection circuit to judge occurrence of a switching-incapable state
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United States of America Patent
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Jun 12, 2018
Issued Date -
Sep 28, 2017
app pub date -
Mar 22, 2017
filing date -
Mar 23, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
An insulated synchronous rectification DC/DC converter is provided. A feedback circuit drives a light-emitting element of a first photocoupler such that the output voltage VOUT of the DC/DC converter approaches a target voltage. A primary side controller is coupled to a light-receiving element of the first photocoupler, so as to switch on and off a switching transistor according to a feedback signal VFB. A synchronous rectification controller controls a synchronous rectification transistor. Upon detecting the occurrence of a switching-incapable state in the synchronous rectification transistor, a protection circuit instructs the primary side controller to stop the switching operation of the switching transistor.
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