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ELECTRONICS

Galvanically Isolated PWM Dimming for LED Driver

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UPDATED 2026-08-09
TYPECircuit
USE-CASEGalvanic Pwm Isolation
EXAMPLEGalvanically Isolated PWM Dimming for LED Driver
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CASE ANALYSIS

Scenario

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

Key decisions

  • Discrete optocoupler (LED + phototransistor) for isolation
  • Open-base NPN as phototransistor to couple light
  • Separate ground domains to preserve galvanic isolation

When to reuse this

Suitable for low-cost isolated PWM dimming in LED fixtures, using standard components without specialized optocoupler ICs.

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