Santa Cruz, Calif.National Semiconductor Corp. has started to sample what it says is the first LED driver with dynamic headroom control and multiple outputs for high-power applications that accurately and efficiently drives up to four strings of LEDs.
Unlike traditional high-brightness LED drivers that drive current to each string independently, the LM3464 PowerWise LED driver includes four channels to drive up to 20 LEDs per channel, reducing system complexity and cost. Applications include industrial, street, and automotive lighting.
The LM3464'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.
This high-voltage current controller with four individual current regulator channels works in conjunction with external N-channel MOSFETs and sense resistors to accurately drive current to each LED string. The LM3464 features a wide input voltage range up to 80V to drive multiple LEDs per string.
It is offered in a 28-pin thermally enhanced TSSOP package.
Pricing: $4.50 in 1,000-unit quantities.
Availability: Samples are available now with production quantities available in June, 2010.
Datasheet: Click here.
National Semiconductor, www.national.com