Powerint公司的DER-281是采用LNK405EG的15W PAR38 TRIAC調光無閃爍的LED驅動器參考設計,輸入電壓180VAC到265VAC,輸出電壓30V/0.5A,滿負載的效率達到83%,EMI和IEC 61000-4-5 ringwave, IEC 61000-3-2 Class C以及EN55015 B標準兼容.本文介紹了LED驅動器參考設計的主要指標,主板和子板電路圖,材料清單和PCB元件布局圖.
The document describes a high power factor (PF) TRIAC dimmable LED driver designed to drive a nominal LED string voltage of 30 V at 0.5 A from an input voltage range of 180 VAC to 265 VAC. The LED driver utilizes the LNK405EG from the LinkSwitch-PH family of ICs.
LinkSwitch-PH ICs allow the implementation of cost effective and low component count LED drivers which both meet power factor, harmonic limits and offer enhanced end user experience. This includes ultra-wide dimming range, flicker-free operation (even with low cost with AC line TRIAC dimmers) and fast, clean turn on.
The topology used is an isolated flyback operating in continuous conduction mode.Output current regulation is sensed entirely from the primary side eliminating the need for secondary side feedback components. No external current sensing is required on the primary side either as this is performed inside the IC further reducing components and losses. The internal controller adjusts the MOSFET duty cycle to maintain a sinusoidal input current and therefore high power factor and low harmonic currents.
The LinkSwitch-PH ICs also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Line overvoltage provides extended line fault and surge withstand, output overvoltage protects the supply should the load be disconnected and accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions. In any LED luminaire the driver determines many of the performance attributes experienced by the end user. For this design a focus was given to compatibility with as wide a range of dimmers and as large of a dimming range as possible, at 230 VAC. This document contains the LED driver specification, schematic, PCB diagram, bill of materials, transformer documentation and typical performance characteristics.
15W LED驅動器指標:
15W調光LED驅動器主要性能:
Focus of design was broad compatibility with standard TRIAC dimmers
o Compatibility includes 1000 W (vs. 600 W) rated models
o No output flicker
o No snap-on when starting from low phase angle
o Up to 1000:1 dimming range – limited only by connected dimmer
o Clean monotonic start-up – no output blinking
Highly energy efficient
o >84% at 230 VAC
Integrated protection and reliability features
o Output open circuit / output short-circuit protected with auto-recovery
o Line input overvoltage shutdown extends voltage withstand during line faults.
o Auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board
IEC 61000-4-5 ringwave, IEC 61000-3-2 Class C and EN55015 B conducted EMI compliant
圖1.15W調光LED驅動器外形圖
圖2.15W調光LED驅動器主板電路圖
圖3.15W調光LED驅動器子板電路圖
主板材料清單(BOM):
主板機械元件清單:
子板材料清單:
圖4.變壓器電路圖
圖5.主板元件布局圖(頂層)
圖6.主板元件布局圖(底層) |
