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Hi
恒压和恒流的区别在于反馈,恒压是通过反馈电阻分压给到反馈FB, 恒流是通过侦测sense电阻给到反馈(可以直接侦测底边sense电阻,如果是高边则是采用运放)。
然后再结合你的条件选择芯片(如升压,或者降压),或者是一些LED drive芯片是可以直接设计成恒流的。
如果是FB反馈(TL5001 FB)(恒压处有采样电阻,下面再串连一个LED,相当于恒流供电给LED了),能推荐一款降压芯片和一个LED driver做个参考不,谢谢!
输入电压5V-12V(典型7V),输出电压6.1V, 经过三极管后2.1V, 后面再经过"电感+LED+采样电阻", LED电流0.75A,电压0.175V, 采样电阻=0.25欧.