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在模拟电路中起到光耦作用的 IC , 在数字电源 ( UCD3138 )中用到的是什么 IC ?

Other Parts Discussed in Thread: UCD3138, PMP4333

 类似模拟电路中光耦作用 , 在数字电源  ( UCD3138 )中用到的是什么 IC ?