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TPS61169 接电阻负载

Other Parts Discussed in Thread: TPS61169

如图,用TPS61169接一个电阻。输入5V ,电阻负载接在VCC和 Return之间。限流电阻Rset=1.5//1.5=0.75OHM,预计电流 0.204/0.75=0.272mA. 负载电阻50OHM.

按设计需求,输出电压应该为50*0.272=13.6V。但实际上输出4.9V。FB 电压0.074V。 SW 输出波形如附图,每隔4.5ms有一段PWM波形。请帮忙看看是哪里出了问题。谢谢!!


SW 输出波形:


图中 PWM 开始处波形:


PWM 结束时波形: