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    首頁產(chǎn)品索引AT9917

    AT9917

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    AUTOMOTIVE LED DRIVER IC WITH HIGH CURRENT ACCURACY

     

    產(chǎn)品信息

    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

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    AT9917TS-GSiTime有源晶振 SMD3225_4P 立即購買

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