Simplifying offline LED lighting design

Paul Boughton

Texas Instruments’ 450V linear controller simplifies current regulation of high-voltage LED strings.

The TI TPS92410 controller integrates a multiplier and tunable phase dimmer detection, as well as analogue dimming inputs and drive circuit protection functions to ease design of downlights, fixtures and lamps powered from an offline AC or conventional DC power source.

The TPS92410 operates over a wide 9.5V to 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 analog dimming input pin with LED shutoff to provide easy light intensity control in intelligent, MCU-based light fixtures using the ultra-low-power MSP430F5172 microcontroller or SimpleLink ZigBee CC2530 wireless MCU.  

Key features and benefits of TPS92410:

* AC and DC applications;

* Under-voltage lockout, MOSFET over-voltage protection and thermal foldback prevent driver and LED damage during fault conditions;

* AC applications with TPS92411;

* Compatible with legacy TRIAC and reverse phase dimmers in AC mains powered LED lighting applications;

* On-chip, internal multiplier produces very high power factor correction at greater than 0.95 with within plus or minus 3% line regulation.