Description

There are automotive applications for indicator lights and LCD local-dimming backlighting. For such applications, most people believe that multi-channel constant-current LED drivers are required. The same intensity and LED color temperature are required to be obtained. To ensure system-level safety, the LED driver must be able to detect faults. The TLC6C5724-Q1 device is an automotive 24-channel constant-current RGB LED driver, and the device can be used to test on the LEDs. The TLC6C5724-Q1 device can provide an output current of up to 50 mA (set by an external resistor). The device has a 7-bit dot correction function with 2 ranges per output. The device also provides 8-bit intensity control for each color group. The intensity of each output can be adjusted through 12-bit, 10-bit, or 8-bit grayscale control. The device's circuitry is capable of detecting various system faults, including LED faults, adjacent pin short-circuit faults, reference resistor faults, and so on. Slew-rate control has 2 adjustable positions to minimize system noise. There is a time interval when the output level changes from one LED group to another. This interval helps reduce inrush current. The SDI and SDO pins allow multiple devices to be cascaded and controlled through a single serial interface.

Features

• AEC-Q100 qualified for automotive applications

• Device temperature grade 1: –40°C to 125°C, TA

• 24 constant-current sink output channels

• 50-mA maximum output current

• 8-V maximum output voltage

• Three output groups: OUTRn, OUTGn, OUTBn

• Output current adjustment

• 7-bit dot correction for each channel

• 8-bit intensity control for each group

• Integrated PWM grayscale generator

• PWM dimming for each individual channel

• Adjustable global grayscale mode: 12-bit, 10-bit, and 8-bit

• Protection and diagnostics

• LED open detection, LED short detection, output GND short detection

• Adjacent pin short detection

• Pre-warning, thermal shutdown

• IREF resistor open and short detection and protection

• Negative bit toggling for GCLK error detection and LOD_LSD register error checking

• LOD_LSD circuit self-test

• Programmable output slew rate

• Output channel group delay

• Serial data interface

2 Applications

• Automotive instrument clusters

• Automotive local-dimming displays

• Automotive panels

• Automotive HVAC control panels

• Automotive center stack displays

• In-vehicle RGB ambient lighting

• Automotive shift-by-wire and transmission