Multi-topology LED driver brings design flexibility to headlamps and fog lights

July 18, 2013 // By Christoph Hammerschmidt
Low electro-magnetic interference (EMI) and great design flexibility for automotive headlamps and fog lights is what Texas Instruments promises to users of its new high-power, multi-topology DC/DC LED driver with adjustable switching frequency and current sense threshold. The TPS92690 is an N-channel MOSFET controller with low-side current sense designed to support step-up (boost) or step-up/step-down (SEPIC, Cuk, flyback) LED driver topologies.

The TPS92690 DC/DC LED controller includes a number of features that give designers significant flexibility to optimize their systems. For example, adjustable switching frequency (up to 2 MHz) and current sense threshold allow designers to optimize LED drive electronics for small size, high efficiency, or a balance of both. Separate pulse-width modulation (PWM) and analog inputs interface with common dimming control methods to adjust LED current or implement thermal foldback. An internal oscillator sets the switching frequency of the converter, but can be overdriven by an external clock for synchronizing switching frequencies with other converters in a design. Low-side current sensing enables design of low-EMI topologies, such as the Cuk converter, while still maintaining a single wire connection to the LED load.

The TPS92690 is offered in AEC-Q100-qualified automotive or commercial grades. Available now in volume from TI and its authorized distributors, the product is offered in a 16-pin PowerPad TSSOP and priced at US$1.55 each in 1,000-unit quantities.

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