Texas Instruments Incorporated (TI) (Dallas, TX) recently introduced a 1.5A constant current DC/DC buck converter with a combination of frequency synchronization, pulsewidth modulation (PWM) dimming and thermal foldback. The TPS92510 features a wide 3.5V to 60V 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 multistring 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 overtemperature condition, which improves safety in the lighting environment.
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