Local dimming backlight LED driver delivers functional safety-compliancy

Texas Instruments TLC69628-Q1 is an LED driver with 48 constant current sink channels, which could provide up to 16-bit individual pixel-level LED PWM control. The additional 7-bit dot correction (DC) is also implemented in each channel to control peak current. Each device shares a data stream by SPI, supporting up to 511 devices' connections. The interface is software compatible with LED drivers in the same group, which can be applied to additional application scenarios based on LED current and total LED number.

To optimise overall systematic power efficiency, the device is provided with adaptive headroom voltage control (AHVC) scheme to optimise headroom voltage across each channel and device. Only the OUT47 pin from the last daisy chain device needs to be programmed as FB pin to optimise LED supply voltage from DC/DC.

The TLC69628-Q1 has supplied LED, current sink, communication and device diagnostics.