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450V linear controller simplifies LED light design

Posted: 16 Oct 2014     Print Version  Bookmark and Share

Keywords:Texas Instruments  linear controller  LED  MOSFET 

Texas Instruments (TI) unveiled a 450V linear controller that promises to ease current regulation of high-voltage LED strings. The TPS92410 combines a multiplier and tunable phase dimmer detection, together with analogue dimming inputs and drive circuit protection functions to simplify the design of downlights, fixtures and lamps powered from an offline AC or conventional DC power source.

The controller operates from 9.5-450V input voltage range and functions as a standalone high-voltage LED string current regulator or pairs with TI's TPS92411 floating switch to provide power in mains AC linear direct drive applications. Together, the TPS92410 and TPS92411 feature driver and LED circuit protection while providing an inductor-free, low LED current ripple lighting solution. The TPS92410 includes an analogue dimming input pin with LED shutoff to provide easy light intensity control in intelligent, MCU-based light fixtures using the ultra-low-power MSP430F5172 MCU or SimpleLink ZigBee CC2530 wireless MCU, noted the company.

For AC and DC applications, the TPS92410 features under-voltage lockout, MOSFET over-voltage protection and thermal foldback to prevent driver and LED damage during fault conditions. For AC applications with TPS92411, the linear controller is compatible with legacy TRIAC and reverse phase dimmers in AC mains powered LED lighting applications, and boasts an on-chip internal multiplier that produces very high power factor correction at greater than 0.95 with within plus or minus three per cent line regulation, detailed TI.

TI's floating switch architecture claims to achieve low LED current ripple performance that is comparable to switch mode power supply (SMPS) designs. The TPS92410 and TPS92411 require no inductive components for power transfer, eliminating cost and bulk, as well as simplifying the design.

Available in volume from TI and its authorised distributors, the TPS92410 is offered in a 13-pin SOIC package and is priced at $0.65 each in 1,000-unit quantities.

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