The AT9917 is an advanced fixed frequency PWM IC designed to control single-switch, boost, SEPIC, and buckLED 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 signal with a duty ratio of 0-100% and a frequency of up to several kilohertz. Temperature foldback of the output current is possible, using an external NTC resistor.The AT9917-based LED driver is suited for automotive LED driver applications. The AT9917 based LED lamp drivers can achieve efficiencies in excess of 90% when buck or boost topologies are used.

  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