Products, Materials + Tools | Dec 19, 2013

Supertex Introduces Dimmable Low Cost LED Driver Solution for Bulbs and Tubes

Supertex, a recognized leader in high voltage analog and mixed signal integrated circuits (ICs), today introduced PS30, a constant frequency (67kHz), constant duty cycle LED driver optimized for dimmable off-line LED bulb/tube applications, providing high power factor correction (PFC). PS30 is intended to drive a single switch, single inductor power converter (flyback for isolated version and buck-boost for non-isolated version) directly from AC line, 110V or 220V, for power levels up to 20W. PS30DB1 demo board provides a 6.3W design solution, achieving 93% PFC and greater than 81% efficiency with ±4% current accuracy. It can be modified for other power levels up to 20W.

PS30 offers smooth dimming to extinction for a wide variety of dimmer types such as leading edge dimmers, trailing edge dimmers, and dimmers with microprocessor controls. It implements a PFC LED driver solution, operating from a 10V shunt regulator derived from the power supply snubber, and provides for a simple design by eliminating feedback components and the optocoupler typical in isolated solutions. It minimizes line induced brightness variation, and protects against open circuit failure with over voltage protection.

Two unique features, covered by filed patents, enhance the performance and value of PS30. It is designed to implement a simpler, lower cost open loop solution. The potential limitation of open loop design is that the output choke tolerance normally results in variation in output current amplitude across product builds in production. PS30 includes proprietary control techniques that largely mitigate this output current variation. It also includes proprietary dimming circuits that ensure proper operation with different triac dimmers. It controls the timing of the power stage and activation of auxiliary loading to eliminate concerns of erratic SCR firing and the resultant flickering. Its circuitry ensures stable operation during light load conditions and a consistent starting point for the zero crossing phase detection.

"PS30 provides a low-cost solution for bulb/tube replacements and similar applications," states Alex Mednik, Director of Applications Engineer for Supertex. "PS30 allows the use of a single flyback power converter stage with a simple inductor to minimize the component count, cost, and size.”

The PS30 is available in a lead(Pb)-free/RoHS compliant 10-lead MSOP package (PS30MG-G). Samples are available from stock. Lead-time for production quantities is 4-6 weeks, ARO. Pricing is US$0.42 each in 1K quantities.

For additional information, please visit the PS30 LED driver website or download the datasheet

About Supertex:
Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused in high voltage interface products for use in the telecommunications, networking systems, flat panel displays, and medical and industrial electronics industries. Supertex product, corporate and financial information is readily available at www.supertex.com.

EDITORIAL

Blue High-Power Laser Diodes from Osram for Show, Point and Line Lasers

Blue High-Power Laser Diodes from Osram for Show, Point and Line Lasers Multi Mode in the InGaN portfolio: The blue multi-mode laser diodes PLPT5 447KA and 450KA from Osram Opto Se- miconductors are available as 1.6 and 2.2 Watt versions with a wavelength of 447 nm. The indium-gallium-nitride diodes are edge emitters, which are built into a hermetically sealed TO ... Read more »

EDITORIAL

UV-C Disinfection Technologies Must be Integrated in EU Renovation Plans

UV-C Disinfection Technologies Must be Integrated in EU Renovation Plans LightingEurope launches an UV-C expert group that promotes the benefits of UV-C disinfection technologies and stimulates market demand and fair market access in Europe. The technology has been proven to deactivate, without exception, all viruses against which it has been tested. LightingEurope is ... Read more »

EDITORIAL

Broadband Neutral White LEDs Including Effective UV Component Modelled on the Sun for Rapid Plant Growth

Broadband Neutral White LEDs Including Effective UV Component Modelled on the Sun for Rapid Plant Growth With the plant LEDs GW3535U and GW1919U (COB) euroLighting offers new broadband LEDs with a special spectrum for stimulating plant growth (horticulture lighting). The advantage: the LEDs are not restricted to a specific plant species or growth phase, but can be used universally. Ready-to-use lamps ... Read more »