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LinkSwitch-PH

Single-stage PFC with Primary-Side CC, TRIAC-dimmable LED Driver IC
PH_schematic.gif
Figure 1. Typical Application Schematic

Description

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

Each device incorporates a 725V 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 into 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
  • Universal input voltage range
  • Enables designs that are electrolytic-free

Accurate and Consistent Performance

  • Fast start-up time
  • 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 signal pins both on PCB and at package

EcoSmart® - Energy-Efficiency Technology

  • Low standby power remote ON/OFF feature (< 50 mW at 230 VAC)
  • No current sense resistors - maximizes efficiency
  • High efficiency operation, >85% achievable

Green Package

  • Halogen free and RoHS compliant package

Output Power Table1, 2
Product3
RV = 2 MΩ
RV = 4 MΩ
85-132 VAC
85-308 VAC
Min.
Output
Power4		 Max.
Output
Power5		 Min.
Output
Power4		 Max.
Output
Power5
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

Notes:

  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. Packages: E: eSIP-7C.
  4. Minimum output power with CBP = 10 µF.
  5. Maximum output power with CBP = 100 µF. LNK403EG CBP = 10 µF.

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-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-194 14 W, TRIAC-dimmable, High Power Factor (> 0.9), High Efficiency (≥ 85%) 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-314 Constant Current, TRIAC Dimmable, High Power Factor (0.9), 15.3 W Output LED Driver
DER-298 Constant Current (<2% Regulation), NonIsolated Buck-Boost, Power Factor Corrected, 18 W LED Driver
DER-296 Constant Current TRIAC Dimmable, High Power Factor (0.9) 7.4 W Output LED Driver
DER-286 Wide Input, High Efficiency, High Differential Surge, High PF (>0.9) 30 W LED Drive
DER-288 15 W Isolated LED Driver with Active Ripple Filter
DER-287 25 W Non-Isolated T8 Buck-Boost PFC LED Driver