RDK-257: 330mA @ 38V Max, 90 ~ 265V in, PFC

The document (linked below) describes a non-isolated, power-factor corrected, low THD, high efficiency LED driver designed to drive an LED string with a nominal voltage of 36 V at a current of 330 mA from an input voltage range of 90 VAC to 265 VAC. It is designed to fit inside a T8 tube fixture.

The LinkSwitch-PH has been developed to cost effectively design a single-stage power factor corrected LED driver with primary-side constant current control. The LinkSwitch-PH controller was optimized for LED driver applications with minimal external parts count and 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, BYPASS pin programming functions, over-temperature protection, frequency jittering, cycle-by-cycle current limit, leading edge blanking, and charge controller for output CC (constant-current) control.

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