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.
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.
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