Summary:
This document describes a high power factor (PF), thyristor dimming LED driver that provides a nominal voltage of 30 V and a current rating of 0.5 A for LED strings over an input voltage range of 180 VAC to 265 VAC. drive. The LED driver uses the LNK405EG device in the LinkSwitch-PH family of ICs.
LinkSwitch-PH ICs can help you design cost-effective LED drivers with minimal component counts that not only meet power factor and harmonic limits, but also provide an end-user experience. Features include an ultra-wide dimming range, flicker-free operation (even with a low-cost AC-input TRIAC dimmer) and fast, smooth turn-on.
The topology used is an isolated flyback that operates in continuous conduction mode. The output current regulation is completely detected from the primary side, eliminating the need for a secondary feedback component. There is also no need to detect external current on the primary side, but inside the IC, further reducing components and losses. The internal controller adjusts the MOSFET duty cycle to keep the input current sinusoidal AC, ensuring high power factor and low harmonic current.
The LinkSwitch-PH IC also offers a variety of sophisticated protection features, including automatic restart in loop open loop or output short circuit conditions. Input overvoltage provides enhanced immunity to input faults and surges. Output overvoltage protects the supply from load disconnection. Accurate hysteresis thermal shutdown ensures that the average PCB temperature is within safe limits under all conditions.
In any LED lighting device, the performance of the drive directly determines the end user's perception of the lighting. The focus of this design is to be as compatible as possible with various dimmers and to be as compatible as possible with dimming ranges at 230 VAC.
This document contains LED driver specifications, schematics, PCB design drawings, bill of materials, transformer specification files, and typical performance characteristics.
15W PAR38 LED driver PCB physical map
15W PAR38 LED Driver Motherboard Schematic
15W PAR38 LED Driver Daughter Board Schematic
15W PAR38 LED Driver PCB Top Layout (Motherboard)
15W PAR38 LED Driver PCB Bottom Layout (Motherboard)
15W PAR38 LED Driver PCB Top Layout (Sub Board)
15W PAR38 LED Driver PCB Bottom Layout (Sub Board)
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