Date
10/31/2012
Texas Instruments has introduced a 1.5-A constant-current DC-DC buck converter with frequency synchronization, PWM (pulse-width modulation) dimming, and thermal foldback. The TPS92510 features a wide 3.5- 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 HB (high-brightness) LEDs at up to 97% 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 by synchronizing to an external PWM clock source. In multi-string implementations, the use of an external clock simplifies EMI filter design and eliminates beat frequencies that may be visible in the lighting application. Thermal foldback ensures some light output remains even in an LED over-temperature condition, which improves safety in the lighting environment. Key features and benefits of the TPS92510 LED driver