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The A8517 is a programmable multi-output LED driver, which can be used for a variety of LED Driver applications. It integrates a current-mode boost converter with internal power switch and 10 current sinks. The IC operates from 4.5 to 36 V, and is able to withstand up to 40 V load-dump conditions encountered in automotive systems.
The I2C interface allows the user to set the LED currents individually, up to 60 mA per LED channel. Adjacent channels may be combined to drive higher-current LED strings. The PWM dimming duty cycle is independently controlled for each LED channel, and each channel can be enabled/disabled independently if needed.
This flexibility makes the A8517 a single solution for a wide range of LED applications, in some cases offering the ability to replace two or more LED driver ICs with a single device.
The control loop is optimized to achieve very high dimming ratios using only PWM control, to react smoothly to supply voltage transients and step changes, and to eliminate night flash in display backlight applications when starting up at very low PWM duty cycle.
The A8517 detects and protects against a wide variety of fault conditions, and two-way communication allows fault status to be reported. It provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, and IC overtemperature. A dual cycle-by-cycle current limit protects the internal switch against switch overcurrent. If required, the IC can drive an external PFET as an input-disconnect switch that is triggered by integrated current sense.
