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Control circuit of DC-DC converter with synchronous rectifier adjusting signal to improve efficiency at light loads and control method thereof
Control circuit of DC-DC converter with synchronous rectifier adjusting signal to improve efficiency at light loads and control method thereof
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机译:具有同步整流器调整信号以提高轻载效率的dc-dc转换器的控制电路及其控制方法
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摘要
A DC-DC converter of a synchronous rectifier type, a control circuit thereof and control method thereof, facilitates detecting and interrupting negative inductor current IL with low power consumption, high accuracy and a simple configuration and facilitates improving the efficiency under a light load. An ON-period decision circuit determines whether an ON-period of the synchronous rectifier switch is too long or too short. An ON-period adjustment circuit generates a signal for adjusting the ON-period, during which the synchronous rectifier switch is ON, based on the decision of the ON-period decision part. A delay circuit adjusts the length of the delay, from the time when a signal changing the ON and OFF states of the synchronous rectifier switch changes to ON, to the time when the synchronous rectifier switch is forcibly turned off based on the adjusting signal.
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