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AT9917

Supertex

Automotive LED Driver

Supertex inc. Automotive LED Driver IC with High Current Accuracy Features ► Switch mode controller for boost, SEPIC & b...


Supertex

AT9917

File Download Download AT9917 Datasheet


Description
Supertex inc. Automotive LED Driver IC with High Current Accuracy Features ► Switch mode controller for boost, SEPIC & buck converters ► Closed loop control of output current ► High PWM dimming ratio ► Internal 40V linear regulator ► Internal 3% voltage reference ► Constant frequency operation with programmable slope compensation ► Linear and PWM dimming ► Programmable jitter to reduce EMI ► +/-1.0A MOSFET gate driver ► Output short circuit protection ► Output over voltage protection ► Programmable hiccup timer ► Temperature fold-back with external NTC resistor ► Soft start ► Meets AEC-Q100 requirements www.DataSheet4U.com AT9917 General Description The AT9917 is an advanced fixed frequency PWM IC designed to control single-switch, boost, SEPIC, and buck LED drivers in a constant current mode. The controller uses a peak current-mode control scheme (with programmable slope compensation) and includes an internal transconductance amplifier to control the output current with high accuracy. The IC includes a +/-1A gate driver that makes the AT9917 suitable for high power applications. An internal 40V linear regulator powers the IC eliminating the need for a separate power supply for the IC. The IC provides a FAULT output, which can be used to disconnect the LEDs in case of a fault condition (such as an alternator load dump in automobiles) using an external disconnect FET. AT9917 also provides a TTL compatible, low-frequency PWM dimming input that can accept an external control s...




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