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TPS65217C给AM3352小系统供电,AM3352启动瞬间电压跌落以及电流过冲问题

Other Parts Discussed in Thread: AM3352, TPS54335-2A

测试发现问题如下:

TPS65217C的输入5V电源在上电后50ms左右被拉低到4.5V左右,此时瞬时电流达到3.9A左右,远远超出功耗估算值,TPS65217C只对AM3352的小系统供电。

TPS65217C的输入5V采用前级的TPS54335-2A芯片供电,最大输出电流3A。

实际测试中发现TPS65217C的输入5V电源被拉低,与TPS65217C的输出SYS1/SYS2的上电吻合,见下图,通道1是输入5V电源,通道2是输出SYS1/SYS2。