Carstens & Cahoon, LLP
Control circuit and control method of switching power supply
A control circuit and a control method of a switching power supply, according to feedback signals on a pin FB and a pin CS, a constant current control module generates and outputs a control signal to control an output current of the switching power supply, thereby regulating duty cycle of a first transistor adaptively and controlling an output current Io of a power supply system to be constant; according to the feedback signals on the pin FB and on the pin CS, a constant current precision compensation module adaptively regulates circuit parameters of the constant current control module and a sample-and-hold module, preventing precision of constant current output from being influenced by change of a working mode and/or by variation of input conditions; when an output voltage changes, QR mode keeps unchanged or depth of a CCM keeps approximately constant.
Wuxi Chipown Micro-Electronics Limited
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inventional inventional additional inventional
Wenliang Yangbo Biao Huazheng Changshen Tao Haisong
Liu Yi Zhou Rui Zhao Zhang Li