Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Power/Alternative Energy
Power/Alternative Energy??

Multi-topology converter integrates constant-current PWM

Posted: 04 Jan 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? converter? LTC3783?

LTC3783 multi-topology converter

Linear Technology Corp. unveiled a current-mode multi-topology converter with constant-current PWM, dimming for driving high-power LED strings and clusters. According to the company, the LTC3783's proprietary techniques provide extremely fast, true PWM load switching with no transient undervoltage or overvoltage issues. Ratios of 3,000:1 can be achieved digitally as True Color PWM dimming guarantees color integrity of white and RGB LEDs. The LTC3783 allows an additional 100:1 dimming ratio using analog control.

The new controller can be used as a boost, buck, buck-boost, SEPIC or flyback converter, 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. Target 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 3V to 36V and provides overvoltage protection while regulating output current. Linear Tech added that the integrated drivers for power and load MOSFET switches and the adjustable feedback voltage (0 to 1.23V) make this new product 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 synchronizable to an external clock. Programmable soft-start limits inrush current during startup, preventing input current spikes.

The LTC3783 is rated for operation from -40C to 85C with a maximum junction temperature of 125C. It is offered in 16-lead 5-by-4mm DFN and TSSOP packages. For 1,000-piece orders, pricing starts at $2.85 each.

Article Comments - Multi-topology converter integrates ...
*? You can enter [0] more charecters.
*Verify code:
Related Datasheets
Part Number Description Category
? LTC3783 PWM LED Driver and Boost, Flyback and SEPIC Converter ICs, Interface



Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top