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LinkSwitch-PL

Single Stage PFC with CC Output, TRIAC-dimmable LED Driver IC for Non-Isolated Applications
PL_schematic.gif
Figure 1. Basic Application Schematic.

Description

Designed for compact LED replacement lamps, LinkSwitch-PL enables very small and low cost TRIAC dimmable, single-stage, power factor corrected, constant current drivers for solid state lighting. LinkSwitch-PL is optimized for direct LED current sensing, operates over a wide input voltage range and delivers output power up to 16 W. Its innovative control algorithm provides flicker-free TRIAC dimming with minimal external components.

Each device incorporates a 725 V rated power MOSFET, a novel discontinuous mode variable frequency/variable on-time controller, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown in a monolithic IC.

Product Highlights

Dramatically Simplifies Off-line LED Drivers

  • Single-stage power factor correction and accurate constant current (CC) output
  • Flicker-free, phase-controlled TRIAC dimming
  • Very low component count with small non-electrolytic bulk capacitor
  • Completely eliminates control loop compensation

Advanced Performance Features

  • Optimized for non-isolated flyback designs
  • Fast start-up time
  • 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 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-Efficiency Technology

  • High power factor optimizes system lumens per input VA
  • Control algorithm balances switching and conduction losses over line and load to maintain optimum efficiency

Green Package

  • Halogen free and RoHS compliant package


Output Power Table
Product1
85-265 VAC
Minimum
Output Power		 Maximum
Output Power2
LNK454D 1.5 W
 3 W
LNK456D 3 W
 6 W
LNK457D/K/V 4 W
 8 W
LNK458K/V 6 W
 11.5 W
LNK460K/V 8 W 16 W

Notes:

  1. Packages: D: SO-8C, K: eSOP-12, V: eDIP-12.
  2. Maximum practical continuous power in an open frame design with adequate heat sinking, measured at +50 °C ambient.
Device Selection Table
Device selection based on length of output LED
series string and current. A typical voltage drop
of 3.5 V per LED is assumed.
Number of
Serial LEDs		 350 mA 500 mA 700 mA 1000 mA
1 LNK454 LNK454 LNK454 LNK456
2 LNK454 LNK456 LNK456 LNK457
3 LNK456 LNK456 LNK457 LNK458
4 LNK456 LNK457 LNK458 LNK460
5 LNK457 LNK458 LNK460  
6 LNK457 LNK458 LNK460  
7 LNK458 LNK460    
8 LNK458 LNK460    
9 LNK458 LNK460    
10 LNK460      
11 LNK460      
12 LNK460      

Product Documents
Application Notean50.pdf
Package Informationpackageinfo.pdf
Data Sheetlinkswitch-pl_family_datasheet.pdf
Reference Designs
RDKs include a working power supply, sample devices, unpopulated pcb, data sheet, comprehensive engineering report, PI Expert design software and other related documentation.
RDK-251 5 W, TRIAC Dimmable, Power Factor Corrected, Non-Isolated LED Driver
RDK-268 1.1 W, Power Factor Corrected, Non-Isolated LED Driver
DER-301 High Efficiency 3.8 W Dimmable Power Factor Corrected LED Driver
DER-297 4.5 W Power Factor Corrected LED Driver (Non-Isolated Buck Boost)
New Design Examples
DER-315 High Efficiency High Power Factor TRIAC Dimmable 4.5 W LED Driver (Non-Isolated Buck Boost)
DER-306 89% Efficiency, High Power Factor Corrected (>0.98), 10 W Output Non-Isolated Buck LED Driver
DER-305 High Efficiency (>91%) High Power Factor (>0.9) 10 W Output Non-Isolated Buck LED Driver
DER-304 4.5 W Power Factor Corrected LED Driver (Non-Isolated Buck Boost)
DER-303 High Efficiency (>90%), Power Factor Corrected, 7.2 W Output LED Driver
DER-302 TRIAC Dimmable, Power Factor Corrected, 7.2 W Non-Isolated LED Driver