Automotive single channel LED driver

30th August 2018

Alex Lynn

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With LEDs being widely used in automotive applications, simple LED drivers are more and more popular. Compared to discrete solutions, a low-cost monolithic solution lowers system level component counts and significantly improves current accuracy and reliability.

The TPS92610-Q1 device is a simple single-channel high-side LED driver operating from an automotive car battery. It is a simple and elegant solution to deliver constant current for a single LED string with full LED diagnostics. Its one-fails–all-fail feature is able to work together with other LED drivers, such as the TPS9261x-Q1, TPS9263x-Q1, and TPS9283x-Q1 devices, to address different requirements.

Features

Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
- Temperature Grade 1: -40 to +125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level H2
- Device CDM ESD Classification Level C3B
Single-Channel Constant-Current LED Driver With PWM Dimming
Wide Input-Voltage Range: 4.5 to 40V
Constant Output Current, Adjustable by Sense Resistor
Precision Current Regulation, Tolerance ±4.6% Across Junction Temperature -40 to 150°C
Maximum Current: 450mA
Heat Sharing With External Resistor
Low Dropout Voltage (Sense–Resistor Voltage Drop Included)
- Maximum Dropout: 150mV at 10mA
- Maximum Dropout: 400mV at 70mA
- Maximum Dropout: 700mV at 150mA
- Maximum Dropout: 1.3V at 300mA
Diagnostics and Protection
- Single-LED Short-Circuit Detection With Auto-Recovery
- LED Open-Circuit and Short-Circuit Detection With Auto-Recovery
- Diagnostic-Enable With Adjustable Threshold for Low-Dropout Operation
- Fault Bus up to 15 Devices, Configurable As Either One-Fails–All-Fail or Only-Failed-Channel-Off
- Low Quiescent Current and Fault-Mode Current (less than 250µA per Device)
Operating Junction Temperature Range: -40 to 150°C