LED driver reference design has long lifetime, high efficiency
Steve Taranovich - January 2, 2013
Power Integrations announced a new long-lifetime LED-driver reference design. DER-340 describes a wide-range (90 VAC to 308 VAC), high-power-factor LED-driver power supply that is suitable for high-bay, exterior and street-lighting applications.
The LED driver detailed in DER-340 uses Power Integrations LinkSwitch-PH family of power conversion ICs which combine single-stage PFC and accurate CC output control. Single-stage LED driver architectures typically yield up to 5% higher efficiency than two-stage designs, which combine losses from separate PFC and constant-current circuits.
A full schematic and reference design is available on Power Integrations website.
Click on image to enlarge
High-voltage aluminum electrolytic bulk capacitors - the least reliable component in traditional lighting power supply circuits - are not required in the single-stage approach, making 50,000-hour lifetimes attainable. In addition to providing a very effective solution for standard lighting applications in benign environments, DER-340 copes with conditions of poor ventilation and high temperatures in industrial applications through the use of ceramic output capacitors and an accurate hysteretic thermal shutdown feature included in the LinkSwitch-PH IC.
There is even a spec on how to design and create the inductor
The single-stage topology also reduces component count, allowing developers to use single-sided boards and smaller enclosures. DER-340 has an energy-efficient efficiency rating above 88% at 230 VAC and over 87% at 120 VAC. Output current tolerance is less than 5% across line, load and temperature.
Power Integrations LinkSwitch-PH ICs feature comprehensive integrated protection and reliability features including: output open circuit / output short-circuit protection with auto-recovery; line input overvoltage shutdown which extends voltage withstand during line faults; and auto-recovering thermal shutdown with large hysteresis that protects both components and the PCB. DER-340 LED-driver power supplies meet all applicable international standards including IEC 61000-4-5, IEC 61000-3-2 Class C, and EN55015 B.
For more information visit the Power Integrations website.