Nenghua Semiconductor launched a45WLEDThe driving power supply is designed for reference. This power supply is a single-stage high PF flyback design, and it is primary side feedback. It does not need optocoupler and output current detection circuit. It completes constant voltage control at the primary level, simplifies the design, and reduces costs.
ThisLEDThe power supply adopts Nenghua Semiconductor CE65H600TOEI depletion typeGallium nitrideSwitch tube, sealed with TO252.The rated withstand voltage of the device is 650V, and the peak withstand voltage is 800V.The power supply supports 176-264Vac input, 54V0.9A output, and 90.5% conversion efficiency.The following is Nenghua SemiconductorLEDFor the analysis of the drive power scheme, let's take a look at the design and materials.
Nenghua45WHigh PFGallium nitrideLEDRefer to the appearance of the design scheme for the drive power supply
Nenghua45WHigh PFGallium nitrideLEDThe drive power DEMO adopts a flat ultra-thin design, which is compatible with the ultra-thin design requirements of LED cabinet lamp products,Gallium nitrideThe AC-DC part is very compact. The blank PCB part can reserve enough space for the DC-DC de strobe circuit and DALI intelligent dimming circuit. The overall thickness of DEMO is well controlled.
DEMO device adopts single side layout.
The measured length of PCB is 177.46mm.
The width is 38.07mm.
The thickness is 15.92mm.
The size of DEMO in hand is intuitive.
In addition, the measured weight of DEMO is about 50g.
Nenghua45WHigh PFGallium nitrideAnalysis of LED driving power reference design scheme
The input fuse specification is 3.15A250V.
NTC thermistor is used to restrain power on surge current.
10D561K varistor is used for overvoltage protection.
The common mode inductor adopts magnetic ring winding.
The safety gauge X2 capacitor is from Weidi, with a capacity of 0.1 μ F.
The second common mode inductor is wound with flat copper wire.
The rectifier bridge is from Youfeng Micro, model FMB40M, specification 4A1000V.
Close up of two film filter capacitors.
The specification of film filter capacitor is 0.47 μ F400V.
Magnetic loop winding is adopted for filter inductance.
10D561K varistor is used for overvoltage protection.
The main control chip of the power supply adopts Umbro OB6566, which is a PFC controller. It does not need auxiliary coils, supports cycle by cycle current limitation, supports multiple protection modes such as high-precision adjustable output overvoltage protection, and supports audio noise free operation.
The filter capacitor supplied by the main control chip is 10 μ F50V.
The primary switch adopts Nenghua CE65H600TOEI gallium nitride device. The Cascode CoreGaN device adopts Nenghua depletion process technology, with a withstand voltage of 650V, a transient withstand voltage of 800V, a conduction internal resistance of 600m Ω, and an extremely low gate charge, which makes the device switch quickly and has low loss, and can greatly improve the system energy efficiency.
In addition, its driving voltage range is ± 20V, which greatly improves the system reliability and is compatible with the traditional Si MOSFET drive;This device adopts TO252 packaging, which has low cost, large heat capacity and small thermal resistance. This packaging can expand the power application range of the device, and has strong heat dissipation and thermal shock resistance, so that the system has higher thermal reliability.
Nenghua Semiconductor CE65H600TOEI information.
The transformer is tightly wound and insulated with tape.
Close up of two blue Y capacitors.
Two rectifier tubes from Xuchanghui, model SP10300L, Schottky diode, specification 10A300V, TO-277B packaging.
The output filter capacitor is from Yongming, which is a LKM series long-life capacitor with a specification of 220 μ F63V.
Summary of charging head network
Nenghua Semiconductor45WThe reference design of GaN LED driving power supply is single-stage high PF flyback design, primary side feedback, no high-voltage filter capacitor, feedback optocoupler, output current detection resistance and constant current control circuit.Constant voltage control is completed at the primary level, which simplifies the circuit, simplifies the design and improves the conversion efficiency.
This LED power supply uses Nenghua Semiconductor CE65H600TOEI depletion GaN switch tube, which is packaged with TO252.The rated withstand voltage of the device is 650V, and the peak withstand voltage is 800V.Employ Umbro OB6566 controller, output adopts Schottky diode rectification and electrolytic capacitor filtering.By introducing GaN devices to LED power supply, the conversion efficiency is significantly improved, the cooling demand is reduced, the volume is reduced, the cost is reduced, and the environment is more friendly.
Nenghua Semiconductor is a high-tech enterprise specializing in the design, production and sales of compound semiconductor high-performance wafers and devices represented by gallium nitride (GaN).Nenghua Semiconductor is one of the few semiconductor companies in the world that simultaneously master enhanced GaN technology, depleted GaN technology and depleted GaN direct drive solutions.At present, the product line covers GaN epitaxial chips, GaN power field-effect transistors, GaN integrated success rate devices and GaN chip foundry.