MartinFowler

75 W CNC Constant Current LED Driver Reference Design

STEVAL-LLL004V1

Overview

The STEVAL-LLL004V1 digitally controlled constant current LED driver reference design features a PFC stage and two DC-DC converters designed to work in transition mode (TM) for optimal efficiency.

The LED driver can deliver 75 W output power and implements both analog and digital techniques for flicker free dimming down to 0.5% of the maximum brightness level. The board features high efficiency, a very high power factor above 0.97, and a low THD across wide input voltage and load conditions, thanks to the high performance ST power products and the advanced algorithms running on the 32-bit STM32F0 microcontroller.

Main features

Wide input voltage range 85 – 265 V_AC
Transition Mode PFC
Two constant current outputs working in transition mode based on different topologies:
- Buck topology
- Inverse buck topology
Output current: 500 mA ±2.5%
- Number of LEDs connected at output: 16 – 24 white LEDs (3.3 V each)
PFC > 0.97 and THD AC
Peak Efficiency at maximum load ≅ 90%

Comprehensive safety protections:
- Open/no-load circuit protection
- Short-/overload circuit protection
Soft start implementation
LED dimming range: 0.5% to 100%
- Analog dimming
- Digital dimming
Dimming control options:
- Push button
- 0-10 V input
Meets EN55022 Class B
WEEE and RoHS compliant

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-19 22:27:43

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