Current feedback method, current feedback circuit, driving circuit and switching power supply thereof
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Nov 18, 2015
filing date -
Oct 31, 2013
priority date (Note) -
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Abstract
In one embodiment, a current feedback circuit can include: (i) a first current mirror circuit having an input terminal coupled to a source of a main power transistor of a switching power supply, and a control terminal configured to receive a PWM control signal, the first current mirror circuit being configured to generate a first mirror current; (ii) the first current mirror circuit and the main power transistor being on such that an output sampling current flows through the first current mirror circuit and the main power transistor when the PWM control signal is active; and (iii) a second current mirror circuit configured to generate an output feedback current that is in a predetermined direct proportion with the output sampling current, and is generated in accordance with the first mirror current.
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