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TPS56C251的PGOOD的配置问题

Other Parts Discussed in Thread: TPS56C215

想用贵公司的降压芯片TPS56C251设计输出5V的稳压源,请问PGOOD端除了下图·中配置的电阻电容外是否还需要外加输入电压,如果需要,请问是多少V,可否通过·分压电阻接到主电路输入端或者5V输出端。 请工程师赐教。