Automotive-compliant LED driver from Diodes Incorporated

Diodes Incorporated has expanded its portfolio of devices supporting automotive exterior illumination with the introduction of the AL5873Q three-channel linear LED driver targeted at simplifying rear lamp cluster designs.

Rated for 125°C ambient temperature operation, this automotive-compliant, AEC-Q100 Grade 1 qualified device meets the demands of next generation vehicle design.

Each of the AL5873Q’s channels can drive up to 250mA, and is set via two reference resistors. Support for two different LED current levels enables more streamlined lighting systems – as the same LEDs can be used in rear lamp clusters for tail and brake lamps. This lowers the bill of materials (BOM) cost substantially.

The AL5873Q has analog and master PWM dimming control functionality, supporting a maximum PWM frequency of 1kHz.

The current on each channel is regulated to within a ±4% tolerance. To conserve power, the AL5873Q goes into standby mode if no PWM signal is detected.

The AL5873Q has built-in protection features with a bidirectional (input/output) fault pin which flags any faults and allows up to four devices to have their fault pins connected together, so that any faults identified are commonly reported. Thermal shutdown and LED string-open/-short protection mechanisms are also included, as well as input undervoltage lockout.

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