| 摘要 |
PROBLEM TO BE SOLVED: To obtain an asymmetric flyback circuit which prevents double delays, by using the output of a pulse-width modulation(PWM) part, when a synchronous rectifier is turned off. SOLUTION: The gate drive signal of a switch is generated by a pulse width modulation controller(PWM) 70A. At the same time, a reference voltage is generated. In a signal delay part 91, the gate drive signal, of the switch which is output by the PWM controller 70A is delayed. Then, in an inversion and compensation part 92, a gate drive signal which is output by the signal delay part 91 is compared with the reference voltage output by the PWM controller 70A. Its resulting value is amplified. When a synchronous rectifier SR is turned off, a compensated gate drive signal is generated. |
