情境
Designing an isolated PWM dimming interface for an LED driver where the control signal must be electrically isolated from the power stage.
這張圖裡有什麼
看懂背後的決策。
01
Discrete optocoupler (LED + phototransistor) for isolation
02
Open-base NPN as phototransistor to couple light
03
Separate ground domains to preserve galvanic isolation
Suitable for low-cost isolated PWM dimming in LED fixtures, using standard components without specialized optocoupler ICs.