Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3783
Edited by the Electronicstalk Editorial
Team on 14 March 2006
Convertor dims to show its true colours
A current-mode multitopology convertor provides constant-current PWM dimming for driving high-power LED strings and clusters.
Linear Technology has introduced the LTC3783, a current-mode multitopology convertor with constant-current PWM dimming for driving high-power LED strings and clusters Proprietary techniques provide extremely fast, true PWM load switching with no transient undervoltage or overvoltage issues
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Ratios of 3000:1 can be achieved digitally as true colour PWM dimming guarantees colour integrity of white and RGB LEDs.
The LTC3783 allows an additional 100:1 dimming ratio using analogue control.
This versatile controller can be used as a boost, buck, buck-boost, Sepic, or flyback convertor, and as a constant-current/constant-voltage regulator.
No Rsense operation uses the on-resistance of a MOSFET to eliminate the current-sense resistor, increasing efficiency.
Applications for the LTC3783 include high-voltage LED arrays and backlighting, as well as voltage regulators in telecom, automotive and industrial control systems.
The LTC3783 operates from input supplies ranging from 3 to 36V and provides overvoltage protection while regulating output current.
Integrated drivers for power and load MOSFET switches and an adjustable feedback voltage (0 to 1.23V) make this part especially convenient for higher-power LED lighting applications.
One resistor sets operating frequency from 20kHz to 1MHz.
Moreover, to reduce switching noise interference, the LTC3783 is synchronisable to an external clock.
Programmable soft-start limits inrush current during startup, preventing input current spikes.
The LTC3783 is rated for operation from -40 to +85C with a maximum junction temperature of 125C.
It is offered in 16-lead 5 x 4mm DFN and TSSOP packages.
1000-piece pricing starts at $2.85 each. Request a free brochure from Linear Technology Corp ...
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