상황
Designing an isolated PWM dimming interface for an LED driver where the control signal must be electrically isolated from the power stage.
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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.