linkswitch-pl系列产品亮点:
dramatically simplifies off-line led drivers
• flicker-free phase-controlled triac dimming
• single stage power factor correction and accurate constant current (cc) output
• very low component count with small non-electrolytic bulk capacitor for compact replacement lamp designs
• compact so8, esop, and edip packages
• completely eliminates control loop compensation
advanced performance features
• optimized for non-isolated flyback designs
• frequency jitter greatly reduces emi filter size and costs
• low dissipation direct sensing of led current
advanced protection and safety features
• cycle skipping regulation for abnormally low output power to clamp peak output current delivered
• 725 v integrated power mosfet allows small bulk capacitance and maximizes power capability
• short-circuit, overload, open feedback and output overvoltage protection
• hysteretic thermal shutdown
• meets high-voltage creepage between drain and all other pins both on pcb and at package ecosmart™ - energy efficient
• high power factor optimizes system lumen per input va
• control algorithm balances switching and conduction losses over line and load to maintain optimum efficiency
图1.linkswitch-pl系列框图
图2.linkswitch-pl系列典型应用电路图 
图2.采用lnk457dg的5w/15v led驱动器,替代a19白炽灯
采用lnk460kg的t8 20w/85v led驱动器(der-345)
the document describes a non-isolated, high efficiency, high power factor (pf) led driver designed to drive a nominal led string voltage of 85 v at 235 ma from an input voltage range of 85 vac to 135 vac (47 hz – 63 hz). the led driver utilizes the lnk460kg from the linkswitch-pl family of ics.
the topology used is a single-stage non-isolated buck boost that meets the stringent space and efficiency requirements for this design. linkswitch-pl based designs provide high power factor (>0.9) meeting international requirements.
this document contains the led driver specification, schematic, pcb details, bill of materials, transformer documentation and typical performance characteristics.
t8 20w/85v led驱动器主要特性:
low cost, low component count (parts), small size (height <8 mm)
pf >0.98, % athd <6% at nominal input
highly energy efficient, >87% at nominal input
single-stage power factor correction and constant current (cc) output
integrated protection and reliability features
output short-circuit and open load protected
auto recovery thermal shutdown with hysteresis
no damage during brown-out conditions
meets 1 kv differential line surge
iec 61000-4-5 ring wave, iec 61000-3-2 c harmonics and en55015 b conducted emi compliant
图3.t8 20w/85v led驱动器外形图(180 mm x 16.4 mm x 8 mm).
t8 20w/85v led驱动器主要指标:
图4.t8 20w/85v led驱动器电路图
t8 20w/85v led驱动器材料清单:
图5.t8 20w/85v led驱动器pcb布局图
powerint公司的t8管20 w/85 v led驱动器是采用linkswitchtm-pl系列的 lnk460kg器件,所用元件数量最少,效率大于87%,功率因素大于0.98,a-thd小于10%,输出功率20w,可替代t8管灯.本文介绍了lnk460kg主要特性,框图,典型应用电路,替代a19白炽灯的5w/15v led驱动器电路图,以及采用lnk460kg的t8 20w/85v led驱动器主要特性和技术指标,电路图,材料清单和pcb布局图.
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