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使用LM5085实现输出45V电压和2A负载电流

Other Parts Discussed in Thread: LM5085, LM3409HV

我希望使用LM5085实现输出45V电压和2A负载电流,输入电压调节范围是55-65v,使用TI在线仿真设计好电路。1,输入电压调节到57V之后,输出电压就从45V迅速下降到20V左右。2,而且带负载时(45v直流电机),输出波动比较大,请问这是什么原因呢?有没有什么解决方案,谢谢。