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!
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Hi,
你好,可以尝试用普通的开关降压转换器做一个恒流源。需要一个电流采样电阻与负载串联,把FB反馈端接到电流采样电阻上。通过设置采样电阻阻值来设定恒流值。用TPS565201这种buck converter,外部元件也少,整个方案可以做的比较小。