Control circuit, control method and flyback converter
In one embodiment, a control circuit can include: a voltage feedback circuit configured to obtain a voltage feedback signal that represents an output voltage of the power stage circuit; a set signal generator configured to output a set signal when a secondary current crosses zero or a voltage sampling signal reaches a valley value; a reset signal generator configured to output a reset signal in a constant on time mode when the voltage feedback signal is greater than a first voltage threshold value, and to output the reset signal in a peak current mode when the voltage feedback signal is less than the first voltage threshold value; and a logic circuit configured to activate a switching control signal according to the set signal, and to deactivate the switching control signal according to the reset signal.
Silergy Semiconductor Technology (Hangzhou) LTD
H Y Y H H H H
H02M Y02P Y02B H02M H02M H02M H02M
inventional additional additional inventional additional additional inventional
Jianxin Huiqiang
Wang Chen