原标题：PowerIntLYT1402-160432W LED驱动器参考设计DER-556

　　Power Integrations公司的LYT1402-1604是LYTSwitch-1系列产品,集成了高压MOSFET和临界导通模式(CrM)控制器,功率因素大于0.9,效率大于93%,725V MOSFET增加了抗线路电压浪涌特性,具有低EMI和设计灵活性,最高可靠性,输入电压90 VAC – 308 VAC,主要用在单级高PF和恒流LED灯和LED管灯.本文介绍了LYT1402-1604产品亮点,框图,8W LED驱动器电路图以及32W非调光非隔离降压LED驱动器参考设计DER-556主要特性,电路图,材料清单和PCB设计图.

　　The LYTSwitch™-1 family is ideal for single-stage, high PF, constant current LED bulbs and tubes. The family incorporates a high-voltage MOSFET with a variable on-time CrM controller. Extensive protection features with minimum external components provide industry leading power density and functionality. The devices can be used in high-side or low-side non-isolated buck topology.

　　The CrM operation results in low turn-on losses and reduces cost of output diode (slower reverse recovery).

　　LYTSwitch-1 devices are suitable for applications from 2 W to 22 W. See Table 1 for selection guidance.

　　LYT1402-1604产品亮点:

　　Single-Stage PFC + Accurate CC Output

　　±3% CC regulation in single line input voltage applications

　　Power factor >0.9

　　High efficiency >93%

　　Robust 725 V MOSFET for increased line voltage surge performance

　　Critical Conduction Mode (CrM) buck

　　Low EMI

　　Excellent line noise and transient rejection

　　Design Flexibility

　　Supports high- and low-side buck topologies

　　Wide input (90 VAC – 308 VAC) and output voltage range operation

　　3 family members cover power range for optimum device selection

　　Requires no inductor bias winding

　　Highest Reliability

　　Lowest component count

　　Comprehensive protection features with auto-restart Input and output overvoltage protection (OVP)

　　Output short-circuit protection

　　Open-loop protection

　　Advanced thermal control Thermal foldback ensures that light continues to be delivered at elevated temperatures

　　Over-temperature shutdown provides protection during fault conditions

　　图1.LYT1402-1604功能框图

　　图2.LYT1402-1604 8W LED驱动器电路图

　　32W非调光非隔离降压LED驱动器参考设计DER-556

      32WLED驱动器参考设计DER-556主要特性:

　　• Single-stage power factor corrected, PF >0.9

　　• Accurate constant current regulation for both output, ±5%

　　• Meets <30% flicker requirement for each output

　　• Highly energy efficient, >90% at 115 V

　　• Low cost and low component count for compact PCB solution

　　• Integrated protection features

　　• No-load output protection

　　• Output short-circuit protection

　　• Overcurrent protection

　　• Thermal fold-back protection

　　• Over temperature protection

　　• No damage during line brown-out or brown-in conditions

　　• Meets IEC 2.5 kV ring wave, 1 kV differential surge

　　• Meets EN55015 conducted EMI

　　This engineering report describes a low component count, non-isolated, non-dimmable LED driver in buck topology, designed to drive a dual output 60 V LED voltage string at 260 mA output current each from an input voltage range of 90 VAC to 132 VAC. The LED drivers utilize the LYT1604D from the LYTSwitch-1 family of devices.

　　DER-556 offers a compact size solution for 32 W LED drivers for bulb applications. The key design goals were high efficiency, accurate constant current regulation for both outputs and low component count.

　　图3.32W LED驱动器参考设计DER-556外形图

　　图4.32W LED驱动器参考设计DER-556外形图(顶视图)

　　图5.32W LED驱动器参考设计DER-556外形图(底视图)

　　32W LED驱动器参考设计DER-556主要指标:

　　图6.32W LED驱动器参考设计DER-556电路图

　　32W LED驱动器参考设计DER-556材料清单:

　　详情请见:

der556.pdf

lytswitch-1_family_datasheet.pdf