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LM25117輸出加電流的時候電壓 VCC 電壓掉下來

Other Parts Discussed in Thread: LM25117

我現在用LM25117 設計120W buck

輸入:20-29V

輸出:12A

在測試的時候輸出電流到2A,IC 就停止輸出PWM

我去量了波形,看到了SS PIN拉LOW,VCC電壓突然掉下來

CH1: UVLO pin, CH2: SS pin, CH3: VCC pin

如果是空載輸出波形就很正確 如下圖

CH1: UVLO pin, CH2: SS pin, CH3: VCC pin

我也有把VCCDIS PIN接到GND,情況還是沒有改善

是IC壞掉嗎?

還是有更好的解決方案?

謝謝

12V and 5V DC to DC-20170406 - .PDF