Linear controller simplifies LED lighting design

6th October 2014

Nat Bowers

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Datasheet

Integrating a multiplier and tunable phase dimmer detection, a 450V linear controller has been introduced by Texas Instruments. The TPS92410 simplifies current regulation of high-voltage LED strings and also integrates analogue dimming inputs and drive circuit protection functions. This eases the design of downlights, fixtures and lamps powered from an offline AC or conventional DC power source.

Operating over a 9.5-450V input voltage range, the controller can function as a standalone high-voltage LED string current regulator. When paired with TI’s TPS92411 floating switch, the controller provides power in mains AC linear direct drive applications. Together the devices offer driver and LED circuit protection while providing an inductor-free, low LED current ripple lighting solution.

The TPS92410 features an analogue dimming input pin with LED shutoff to provide easy light intensity control in intelligent, MCU-based light fixtures. Suitable for AC and DC applications, it also provides under-voltage lockout, MOSFET over-voltage protection and thermal foldback to prevent driver and LED damage during fault conditions.

Compatible with legacy TRIAC and reverse phase dimmers in AC mains powered LED lighting applications, the internal multiplier produces high power factor correction (greater than 0.95) with ±3% line regulation.

Supplied in a 13-pin SOIC package, the TPS92410 is available now for $0.65 each in 1,000 unit quantities. TI also offers the 120V TPS92410EVM-001 and 230V TPS92410EVM-002 light engine evaluation modules for $99.00 each.