Automotive LED lighting controller improves reliability, drives external MOSFET

December 01, 2017 // By Graham Prophet
Texas Instruments (TI) has developed what it believes to be the first 3-channel high-side linear automotive light-emitting diode (LED) controller without internal MOSFETs, giving designers greater flexibility for lighting designs.

The TPS92830-Q1’s architecture enables higher power and better thermal dissipation than conventional LED controllers, for automotive LED lighting applications that require high performance and reliability.

 

Many LED drivers integrate the MOSFET, which limits designers’ ability to customize features. With that type of driver, designers may need to make significant design modifications to achieve the desired system performance. The TPS92830-Q1 LED controller’s flexible on-board features give designers the freedom to select the best MOSFET for their system requirements.

 

An on-chip pulse-width modulation (PWM) generator or PWM input enables flexible dimming. Designers can use either the analogue control or PWM to manage an output current of more than 150 mA per channel, to power automotive rear combination lamps and daytime running lights. By pairing the LED controller with an external MOSFET, the designer can achieve the required high power output while distributing the power across the controller and MOSFET to avoid system overheating. By retaining linear architecture, the TPS92830-Q1 provides improved electromagnetic interference (EMI) and electromagnetic compatibility (EMC) performance. Advanced protection and built-in open and short detection features help with system reliability requirements. An output current derating feature protects the external MOSFET under high voltage conditions to ensure system reliability.

 

Support tools include the TPS92830-Q1 3-Channel High-Current Linear LED Controller evaluation module ; and a reference design , ‘TPS92830-Q1 with the EMC Compliant Automotive Daytime Running Light and Position Light Reference Design with LED Thermal Protection’.

 

In a thin small outline package (TSOP), the part is priced at $1.96 (1,000).

 

TI; www.ti.com/tps92830q1-pr-eu

 

Further TI links;

Blog post: “ A Wiser Choice for Automotive Lighting .”

App note: How to Select MOSFET for TPS92830-Q1 Circuit