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TPS54202: 空载功耗较大,如何降低?

Part Number: TPS54202
Other Parts Discussed in Thread: TPS54302

你好,
 我们一款民用产品使用TPS54202DDCT,测试发现断开其输出+5V后端带的负载,总输入电源那里仍然有24V@20mA功耗,请帮忙降低这个功耗。

麻烦看看电路图是否需要优化?+5V负载正常工作时大概5V@50mA。电路图如下。
产品使用外部24V稳压源,24通过LTC4020输出12V,12V通过TPS54202输出+5V,产品关机后板子进入待机状态,LTC4020依旧可以输出12V,其芯片本身消耗24V@10mA,12V经TPS54202输出5V,其本身消耗24V@20mA。

此外,TPS54202空载时功耗多大呢?