DER-287: 250mA @ 100V Max, 180 ~ 265VAC in

This document describes a non-isolated, power factor corrected, low THD, high-efficiency LED driver designed to drive ~100 V LED string at 250 mA from an input voltage range of 180 VAC to 265 VAC.

The LinkSwitch-PH has been developed to cost effectively implement a single-stage power factor corrected LED driver and primary-side constant-current control. The LinkSwitch-PH controller is optimized for LED driver applications and requires minimal external parts. It provides control of the output current through the LED load without the use of an optocoupler.

The LinkSwitch-PH monolithically integrates the 725 V power MOSFET and controller. The controller consists of an oscillator, PWM, 6 V regulator, over-temperature protection, frequency jittering, cycle-by-cycle current limit, leading edge blanking, and a charge controller for output CC (constant current) control.

The LinkSwitch-PH provides a sophisticated range of additional protection features including auto-restart for control loop open/short faults and output short-circuit conditions. The accurate hysteretic thermal shutdown ensures safe PCB temperatures under all conditions.

The non-isolated power factor corrected buck-boost design presented in this report shows how LinkSwitch-PH dramatically simplifies off-line, high-efficiency, power factor corrected LED driver design with very low parts count and enables a Class C harmonic currents compliant implementation of a very high efficiency, high output voltage design.

This document contains the LED driver specification, schematic, PCB diagram, bill of materials, conducted EMI measurements, thermal measurements, inductor documentation and typical performance characteristics.