LED DRIVER IC, SINGLE-STAGE PFC, PRIMARY-SIDE CONSTANT CURRENT CONTROL AND TRIAC DIMMING/NON-DIMMING DEVICE OPTIONS

The LNK406 dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF >0.9, and TRIAC dimming capability. The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolytic bulk capacitor. The advanced primary-side control used by the LNK406 device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits.LNK406 incorporates a 725 V power FET, a continuous mode PWM controller, a high-voltage switched current source for self biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown.

• Dramatically Simplifies Off-line LED Drivers
  • Single-stage combination of power factor correction and accurate constant-current (CC) output
  • Enables very long lifetime designs (no electrolytic capacitors)
  • Eliminates optocoupler and all secondary current control circuitry
  • Eliminates control loop compensation circuitry
  • Simple primary-side PWM dimming interface
  • Universal input voltage range
  • Optimized for flicker-free TRIAC dimming
• EcoSmart™ - Energy Efficient
  • Single-stage PFC combined with output CC control
  • Greatly increases efficiency, >90% achievable
  • Reduces component count
  • No current sense resistors
  • Low standby power remote ON/OFF feature (<50 mW at 230 VAC)
• Accurate and Consistent Performance
  • Compensates for transformer inductance variations
  • Compensates for line input voltage variation
  • Frequency jittering greatly reduces EMI filter size and cost
• Advanced Protection and Safety Features
  • Auto-restart for short-circuit protection
  • Open circuit fault detection mode
  • Automatic thermal shutdown restart with hysteresis
  • Meets high voltage creepage requirement between DRAIN and all other signal pins both on PCB and at package
• Applications
  • Off-line LED driver
• Output Power 10 W-22 W (Rv=4 MO, 85-308VAC)