Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3595
Edited by the Electronicstalk Editorial
Team on 01 February 2008
Buck mode convertor drives up to 160
LEDs
An external resistor sets the LED current for all 16 channels and dimming is then controlled for each channel using individual PWM pins.
Linear Technology has released a 45V 2MHz DC/DC buck mode convertor designed to operate as a 16-channel constant current LED driver Each channel of the LT3595 can drive up to ten 50mA LEDs in series, enabling the LT3595 to drive up to 160 x 50mA LEDs while delivering efficiencies up to 92%
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Its multichannel capability makes it ideal for large TFT-LCD backlighting applications.
Each of the 16 channels is independently operated and can be dimmed to ratios as high as 5000:1.
A 2MHz fixed frequency, current mode architecture offers stable operation over a wide range of input and output voltages while minimising the size of the external components.
Power switches, Schottky diodes and compensation components are all internal, providing a very small solution footprint while minimising component cost.
Its thermally enhanced 5 x 9mm QFN package ensures a very compact solution footprint, driving up to 30W of LEDs.
The LT3595 uses 100mA, 45V internal switches.
An external resistor sets the LED current for all 16 channels and dimming is then controlled for each channel using individual PWM pins.
The relative current matching among the 16 drivers is 8%, ensuring uniform LED brightness.
The LT3595 also enables LEDs to be disconnected in shutdown, open LED and thermal protection.
The LT3595EUHH is available from stock in a thermally enhanced 56-lead 5 x 9mm QFN package.
1000-piece pricing starts at US $6.95 each, with devices available from stock. Request a free brochure from Linear Technology Corp ...
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