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TPS40428: PWM输出信号频率偏低

Part Number: TPS40428
Other Parts Discussed in Thread: CSD95372BQ5M, CSD95378BQ5M

我的电源板,TPS40428的PWM引脚输出信号频率始终只有45kHz,手册上应该是500kHz, RT引脚对电阻40.2k,有没用过此芯片的大神指点一下