LED driver with dynamic headroom control is industry’s first
The LM3464 LED driver is offered as the first of its kind with dynamic headroom control and multiple outputs for high-power applications. Unlike traditional high-brightness LED drivers that drive current to each string independently, this LED device includes four channels to drive up to 20 LEDs per channel, reducing system complexity and cost.
The chip’s dynamic headroom control feature dynamically adjusts the LED supply voltage through the power supply feedback to the lowest level required to provide optimal system efficiency. Features include an input voltage range up to 80 V to drive multiple LEDs per string, and a thermal foldback feature which protects the LEDs from unsafe temperatures that can significantly degrade the light output or lifetime of the LEDs.
The LM3464 features both PWM and analog dimming interfaces to allow the user to select between various dimming types for different applications. Offered in a 28-pin thermally enhanced TSSOP package, the part also features a VIN undervoltage lockout, LED open/short circuit and overtemperature fault signaling to the system controller. ($4.50 ea/1,000 — samples available now; prod qty, June.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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