Low-Cost High-Efficiency, Power Conversion Efficiency 45W High PF Gallium Nitride LED Driver Reference Design Analysis (FMB40M UMSB/YFW YouFeng Micro)

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Preface

Nenghua Semiconductor has introduced a 45W LED driver reference design, which features a single-stage high PF flyback configuration with primary-side feedback. Eliminating the need for optocouplers and output current sensing circuits, this design achieves constant voltage control at the primary stage, resulting in a simplified circuit, streamlined design, and reduced costs.

This LED power supply employs the CE65H600TOEI depletion-mode gallium nitride switching transistor from Nuvoton Semiconductor, packaged in a TO252 format. The device features a rated voltage withstand of 650V and a peak voltage withstand of 800V. The power supply supports an input range of 176-264Vac, delivers an output of 54V at 0.9A, and achieves a conversion efficiency of 90.5%. Below is an analysis of Nuvoton Semiconductor's LED driver power supply solution, showcasing its design and component selection.

Appearance of the NUVOTON 45W High PF GaN LED Driver Reference Design

The Nenghua 45W high PF gallium nitride LED driver power DEMO adopts a flat and ultra-thin design, which is compatible with the ultra-thin design requirements of LED cabinet lights. The gallium nitride AC-DC part is very compact, and the blank PCB part can reserve sufficient space for the later DC-DC flicker circuit and DALI intelligent dimming circuit. The overall thickness control of the DEMO is excellent.



DEMO devices adopt a single-sided layout.



The measured length of the PCB board is 177.46mm.



The width is 38.07mm.



The thickness is 15.92mm.



Experience the size of the demo in your hand intuitively.

Additionally, the weight of the DEMO was measured to be approximately 50g.

Analysis of Reference Design Scheme for Nenghua 45W High PF Gallium Nitride LED Driver Power Supply



The input fuse specification is 3.15A250V.



NTC thermistor is used to suppress surge current during power on.


The 10D561K varistor is used for overvoltage protection.


The common mode inductor is wound with a magnetic ring.



The safety regulation X2 capacitor comes from Weidi, with a capacity of 0.1 μF.


The second common mode inductor is made of flat copper wire winding.

The rectifier bridge is from Yufengwei, model FMB40M, with a specification of 4A1000V. Adopting UMSB packaging, YFW Youfeng Micro brand

Yufeng Microelectronics "is a high-tech enterprise specializing in the research and development, production, and sales of semiconductor discrete devices. The company mainly produces and sells: ordinary rectifier diodes, fast recovery diodes, high-efficiency diodes, ultrafast recovery diodes, Schottky diodes, low voltage drop Schottky diodes, silicon carbide diodes, rectifier bridge stacks, fast recovery rectifier bridge stacks, Schottky bridge stacks, TVS transient suppression diodes, ESD electrostatic protection components, voltage regulators, transistors, thyristors, MOSFETs, and so on. For more details, please visit our official website www.yfwdiode.com.