原标题：PowerIntLYT7503-750440W LED驱动器参考设计DER-570

　　Power Integrations公司的LYT7503-7504是LYTSwitch™-7系列产品,是切相调光单级LED驱动器,具有PFC和恒流输出,并集成了高压MOSFET和可变开态临界导通模式(CrM)控制器,功率因素大于0.9,效率大于85%,725V MOSFET增加了抗线路电压浪涌特性,具有低EMI,主要用在LED照明如吸顶灯等.本文介绍了LYT7503-7504产品亮点,框图,7.5W LED驱动器电路图以及40W大范围调光非隔离降压LED驱动器参考设计DER-570主要特性,电路图,材料清单和PCB设计图.

　　The LYTSwitch™-7 family is ideal for single-stage, high PF, constant current LED dimmable applications.

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

　　LYTSwitch-7 devices are suitable for applications from 4 W to 22 W. For more information, see Application section. LYTSwitch-7 peak current mode operation is suitable for TRIAC applications without the need for an active bleeder.

　　LYT7503-7504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 >85%

　　Robust 725 V MOSFET for increased line voltage surge resistance

　　Critical Conduction Mode (CrM) buck

　　Low EMI

　　Excellent line noise and transient rejection

　　Dimming Highlights

　　Fast turn-on (<500 ms)

　　Low pop-on

　　Better than 10:1 dimming ratio

　　Simple passive R-C damper

　　Monotonic dimming profile

　　Design Flexibility

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

　　2 family members cover power range for optimum device selection

　　Requires no inductor bias winding

　　Small form factor package – SO-8

　　Highest Reliability

　　Industry’s lowest component count dimming solution

　　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.LYT7503-7504框图

　　图2. LYT7503-7504 7.5W LED驱动器电路图

　　Schematic from DER-561 7.5 W, 60 V, 125 mA Dimmable Non-Isolated A19 LED Driver for Wide Input Range: 90 – 300 V VAC using LYT7503D in Low-Side Buck Configuration.

　　40W大范围调光非隔离降压LED驱动器参考设计DER-570

　　40WLED驱动器参考设计DER-570主要特性:

　　• Single-stage power factor corrected, PF >0.9 measured at 115 VAC input

　　• Two-rail outputs in a single board

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

　　• Meets <30% flicker requirement for each output

　　• Highly energy efficient, >85% at

　　• 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 an LED driver configured as a low-side buck utilizing the LYT7504D from the LYTSwitch-7 family of devices. This is a low component dimmable LED driver designed to power a dual output 52 V LED voltage string at 380 mA output current each, from an input voltage range of 100 VAC to 300 VAC. Dimming performance is optimized at low line input (i.e. 120 VAC), while maintaining accurate regulation for non-dimmable high-line input.

　　DER-570 offers a compact size solution for 40 W LED drivers for ceiling light applications. The key design goals were high efficiency, accurate constant current regulation for both outputs and low component count.

　　图3.40W LED驱动器参考设计DER-570外形图

　　图4.40W LED驱动器参考设计DER-570外形图(顶视图)

　　图5.40W LED驱动器参考设计DER-570外形图(底视图)

　　40W LED驱动器参考设计DER-570主要指标:

　　40W LED驱动器参考设计DER-570材料清单:

　　详情请见:

lytswitch-7_family_datasheet.pdf

der570.pdf