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TPS92512EVM-001: TPS92512EVM无法用PWM调光

Part Number: TPS92512EVM-001

我用TPS92512EVM做PWM调光测试
输入30V,输出我是用负载机设定24V,此时输出电流会有1.5A
当我用PWM做调光
PWM 是1KHZ DUTY 50%  PWM振福是0-3.3V
应该输出电压是24V , 输出电流是0.75A
但此时输出电压为16V , 输出电流为0.6A
请问我是哪边有问题
感谢