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Six-channel ALED7707-based LED driver with embedded boost converter for automotive interior lighting and TFT backlighting

STEVAL-ILL067V1

Overview

The purpose of this evaluation board is to provide an application example of a six-channel, medium-current LED driver using the ALED7707 chip. The monolithic boost converter provides the required LED supply voltage starting from a single supply rail, while the brightness of the LED strings connected to the six outputs is controlled through a PWM signal. Open LED and LED short-circuit fault conditions are detected and managed.

The board has been designed to provide a compact reference solution for automotive applications involving several LEDs arranged in multiple strings (e.g. interior lighting, infotainment LCD backlighting, etc.).

Main features

Wide DC input voltage (6 V - 32 V)
Six 70 mA output channels (capable of 30 mA to 85 mA each)
PWM brightness control (10 µs minimum dimming on-time)
Up to 10 white LEDs per channel (36 V OVP threshold)
> 90% efficiency (V_IN=12 V, V_BOOST=30 V, f_SW=1 MHz, no snubber)
On-board input filter for conducted EMI reduction
RoHS compliant
All automotive-grade components

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-05-08 20:35:53

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