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Multi-topology DC/DC LED driver for automotive lighting

Posted: 26 Jul 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Texas Instruments? LED drivers? MOSFET? automotive?

Texas Instruments recently debuted a 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 provides design flexibility and low electro-magnetic interference (EMI) for automotive headlamps, fog lights and general-purpose area lighting. It is designed to support step-up (boost) or step-up/step-down (SEPIC, Cuk, flyback) LED driver topologies.

The TPS92690 DC/DC LED controller includes an adjustable switching frequency (up to 2MHz) and current sense threshold. It also features separate pulse-width modulation (PWM) and analogue 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 synchronising 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.

Further information regarding the TPS92690 can be found here.





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