原标题：Powerint LNK405EG 15W PAR38 TRIAC调光LED驱动方案(DER-281)

　　powerint公司的DER-281是采用LNK405EG的15W PAR38 TRIAC调光无闪烁的LED驱动器参考设计, 输入电压180VAC到265VAC,输出电压30V/0.5A,满负载的效率达到83%,EMI和IEC 61000-4-5 ringwave, IEC 61000-3-2 Class C以及EN55015 B标准兼容.本文介绍了LED驱动器参考设计的主要指标,主板和子板电路图,材料清单和PCB元件布局图.

　　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驱动器指标:

　　15W调光LED驱动器主要性能:

　　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

　　图1.15W调光LED驱动器外形图

　　图2.15W调光LED驱动器主板电路图

　　图3.15W调光LED驱动器子板电路图

　　主板材料清单(BOM):

　　主板机械元件清单:

　　子板材料清单:

　　图4.变压器电路图