Products, Materials & Tools | Jun 28, 2010

POWER INTEGRATIONS Offers LED Driver IC for TRIAC Dimmable Isolated Solution and Announces Driver IC for Non-Isolated Application

LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring Power Factors greater than 0.9, TRIAC dimming, and high efficiency, while LinkSwitch-PL will enable very small and low cost TRIAC dimmable, single-stage, power factor corrected, constant current drivers.

 

LinkSwitch-PH (see Figure 1)

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
• 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

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.

LinkSwitch-PL (coming soon, see Figure 2)

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, buck and tapped buck topologies
• Frequency jitter greatly reduces EMI filter size and costs
• Low dissipation direct sensing of LED current
Advanced Protection and Safety Features
• 725 V integrated MOSFET allows small bulk capacitance and maximizes power capability
• Latch-off protection for short circuit/open feedback and output overvoltage
• Auto-restart for overload condition
• 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 watt by reducing input VA
• Control algorithm balances switching and conduction losses over line and load to maintain optimum efficiency
• Cycle skipping regulation for abnormally low output power to clamp peak output current delivered
Green Package
• Halogen free and RoHS compliant package

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.

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