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TPS40210 升压模式测量下 MOS管两端VDS异常?

Other Parts Discussed in Thread: TPS40210

采用PMP5859.2 TPS40210方案,在测试VDS电压时,在带负载4W时的VDS电压波形,想问下这个正常么,电路参数与PMP5859.2一样。虽然输出电压在15V,但是纹波大小不能满足要求,输出的纹波存在十几K的纹波,一直没有办法消除。@