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TPS56837H: UVLO欠压关断问题

Part Number: TPS56837H

Hi:

   关于TPS56837H,我这边有个问题想请教下。我使用该芯片,24V转12V输出,在进行欠压测试时,规格书中低于3.5V就会关断输入,即不会有输出电压。我这边4A负载和空载均有测试,EN使能脚达到2V以下,才会关断,想请教下为什么和规格书3.5V差距这么大?