New LED driver combines frequency synchronization, PWM dimming and thermal foldback

November 01, 2012 // By Paul Buckley
Texas Instruments Incorporated has introduced a 1.5-A constant current DC/DC buck converter with an industry-leading combination of frequency synchronization, pulse-width modulation (PWM) dimming and thermal foldback.

The TPS92510 features a wide 3.5-V to 60-V input voltage operating range and integrated MOSFET. Together with TI's WEBENCH LED Architect, the lighting developer can quickly design a power management circuit to drive a string of up to 17 high-brightness LEDs at up to 97-percent power efficiency in automotive, industrial and general illumination applications.

Unlike conventional buck LED drivers, TI’s TPS92510 can operate with fixed frequency either by utilizing its internally-generated clock or via synchronization to an external PWM clock source. In multi-string implementations, the use of an external clock eliminates beat frequencies that may be visible in the lighting application and simplifies EMI filter design. Thermal foldback ensures some light output remains even in an LED over-temperature condition, which improves safety in the lighting environment.

The TPS92510 joins TI’s LED driver portfolio that includes the 0.5-A LM3402, 1.0-A LM3404 and 1.5-A LM3406 hysteretic, non-synchronous, constant current LED buck regulators that feature LED open circuit protection, low-power shutdown and thermal shutdown.

Availability and Pricing

The TPS92510 is available in volume now from TI and its authorized distributors. Offered in a 4.9-mm by 3-mm, 10-pin PowerPad MSOP package, the TPS92510 is priced at $1.65 each in 1,000-unit quantities.
More information about the TPS92510 DC/DC buck converter at