3.7升5V1A,用来驱动一组红外led,红外led每隔200ms发射一簇信号。VFB升高到1.4xV,导致输出偏大到5.8v怎么回事?二极管为B220-13-F。
sch:
PCB:
signal:
in:
fb:
sw:
out:
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我需要Infrared LED发射38kHz的0,1信号,TPS61500的PWM频率只有1kHz,所以不行吧