The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring PF > 0.9, TRIAC dimming and high efficiency. The highly integrated controller eliminates passive circuitry required for power factor correction, optocoupler and secondary current control circuitry. LinkSwitch-PH introduces a new control technique that provides very high power factor and accurate output current control.

LinkSwitch-PH incorporates a 725 V power MOSFET, a continuous-mode PWM controller, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry, all 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
  • Eliminates optocoupler and all secondary current control circuitry
  • Eliminates all control loop compensation circuitry
  • Simple primary-side PWM dimming interface

Accurate and Consistent Performance

  • Compensates for transformer inductance tolerances
  • Compensates for line input voltage variations
  • Frequency jittering greatly reduces EMI filter size and costs

Advanced Protection and Safety Features

  • Auto-restart for short circuit protection
  • Open circuit fault detection mode
  • Automatic thermal shutdown or restart with hysteresis
  • Meets high voltage creepage requirement between DRAIN and all other pins both on PCB and at package

EcoSmart® – Energy Efficient

  • Low standby power remote ON/OFF feature (< 50 mW at 230 VAC)
  • No current sense resistors – maximizes efficiency Green Package
  • Halogen free and ROHS compliant package Applications
  • Offline LED driver

Output Power Table1, 2
RV = 2 MΩ
RV = 4 MΩ
85-132 VAC
85-308 VAC
LNK403/413E/L 2.5 W 4.5 W 6.5 W 12 W
LNK404/414E/L 2.5 W 5.5 W 6.5 W 15 W
LNK405/415E/L 3.8 W 7.0 W 8.5 W 18 W
LNK406/416E/L 4.5 W 8.0 W 10 W 22 W
LNK407/417E/L 5.5 W 10.0 W 12 W 25 W
LNK408/418E/L 6.8 W 13.5 W 16 W 35 W
LNK409/419E/L 8.0 W 20 W 18 W 50 W
LNK410/420E/L 18 W 31 W 40 W 78 W


  1. Continuous power in an open frame with adequate heat sinking at device local ambient of 70 °C.
  2. Power level calculated on typical LED string voltage with efficiency > 80%.
  3. Minimum output power with CBP = 10 µF.
  4. Maximum output power with CBP = 100 µF. LNK4x3EG CBP = 10 µF.
  5. Package: E: eSIP-7C, L: eSIP-7F.

Product Documents
Application Notean49.pdf
Package Informationpackageinfo.pdf
Data Sheetlinkswitch-ph_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-290 >92% Efficient 75 W Power Factor Corrected LED Driver
RDK-257 12 W Non-Isolated, Power Factor Corrected, LED Driver
RDK-193 7 W, TRIAC-dimmable, High Power Factor (> 0.9), High Efficiency (≥ 81%) LED Driver
RDK-195 14 W, TRIAC-dimmable, High Power Factor (> 0.9), High Efficiency (≥ 85%) LED Driver with SCR Damper
New Design Examples
DER-356 92% Efficiency 24 W T10, Non-Isolated, Power Factor Corrected, LED Driver
DER-291 >91% Efficient 150 W, Two Channel, Power Factor Corrected, SSL LED Driver
DER-344 12.8 W Constant Current, High Power Factor (>0.9) Tapped Buck LED Driver
DER-341 14.5 W Power Factor Corrected (>0.98) TRIAC Dimmable Non-Isolated Buck A19 Lamp Replacement LED Driver
DER-340 40.5 W, High Power Factor (>0.95), <5% IOUT Tolerance, Non-Isolated Buck LED Driver
DER-318 Low Profile T8 (<10 mm), 23 W, Isolated, Power Factor Corrected, LED Driver
DER-314 Constant Current, TRIAC Dimmable, High Power Factor (0.9), 15.3 W Output LED Driver