Isolated DC/DC converter and primary side controller thereof, control method and power adaptor and electronic device using the same
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United States of America Patent
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Aug 20, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jul 6, 2017
filing date -
Jul 8, 2016
priority date (Note) -
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Abstract
A primary side controller for controlling a switching transistor on a primary side of an isolated DC/DC converter, includes: a low voltage state detecting circuit configured to detect a low voltage state in which an output voltage of the DC/DC converter is lower than a predetermined value; and a pulse width modulator configured to generate a pulse signal whose ON time is adjusted depending on a feedback signal from a secondary side, wherein a period of the pulse signal in the low voltage state is longer than a period of the pulse signal in a non-low voltage state in which the output voltage is higher than the predetermined value.
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