Milpetas,CA Linear Technology introduces the LTC3783 , a current-mode multi-topology converter 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. Ratios of 3000:1 can be achieved digitally as True Color 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 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. 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 V to 36 V and provides overvoltage protection while regulating output current. Integrated drivers for power and load MOSFET switches and an adjustable feedback voltage (0 V to 1.23 V) make this part especially convenient for higher-power LED lighting applications. One resistor sets operating frequency from 20 kHz to 1 MHz. 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 -40°C to 85°C with a maximum junction temperature of 125°C. It is offered in 16-lead 5 x 4mm DFN and TSSOP packages. 1,000-piece pricing starts at $2.85 each. Linear Technology Ltd , Milpetas,CA. www.linear.com.
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