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High Efficiency Low-cost 0.5 A/33 V LED Driver Module

High Efficiency Low-cost 0.5 A/33 V LED Driver Module
Here we outline the component selection and some design criteria for a simple constant-current driver module with fast PWM input, suitable for driving middle and high power LEDs, and operating from 8 up to 33 V with output current configurable in steps from 0.1 up to 0.5 A.
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Specification: Topology: Buck Regulation: Hysteretic Input voltage: 8–33 VDC Output current: 100–500 mA Switching frequency: 1 MHz max Current ratio: 0.13 Ohm A–1 Dimensions: 16 x 16 x 5.5 mm (0.63 x 0.63 x0.22 in) Weight: 1.6 g Thermal shutdown Current protection Dimming: PWM up to 20 kHz
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