Automotive LED driver reduces headlight size

Smaller and more cost-effective headlight systems are promised by Cypress Semiconductor, of its S6BL112A automotive grade LED driver. It is, it claims the first to feature synchronous control, which helps it provide industry-leading conversion efficiency, says the company, for stable performance. It is also able to drive LEDs at a high 2.1MHz switching frequency, for a compact headlight that uses small, inexpensive inductors, reducing physical size and bill of materials costs.

The LED drivers combine with the company’s Traveo microcontrollers and power management ICs. It has an input voltage range of 4.5 to 42V, encompassing extreme operating conditions such as cold-cranking, or load dump.

Electrical system safeguards can include system safety functions such as under-current detection, over-current and voltage protection, as well as the ability to mask LED open diagnosis during cold cranking. Synchronous operation eliminates unstable dimming that can occur when the input voltage is low.

The one-channel 2A output buck LED driver supports both analogue and PWM dimming functions. Switching frequency can be set between 205kHz and 2.1MHz, with high output current accuracy of ±2%. The device enables slew rate control without an external filter, limiting EMI generation, says the company.

It is available in a 16pin, thermally-enhanced TSSOP and is currently sampling, with production expected in Q4 2016.


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