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请问专家恒流源方案

Other Parts Discussed in Thread: TPS565201, LM5117

需要1个脉冲恒流源,5HZ,开启时间大概10ms, 28V输入,4A左右电流,负载在流过4A时我测量压降为2V左右,

因为电路板尺寸比较小,能否帮忙推荐一个比较精简的方案? 另外,电流最好有途径可调,谢谢!