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| LTC3783: High Power LED Driver with 3000:1 PWM Dimming Range Delivers
True Color | | | |
MILPITAS, CA – Linear Technology Corporation 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 PWMä dimming guarantees color integrity
of white and RGB LEDs. The LTC3783 allows an additional 100:1 dimming ratio using analog 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 3V to 36V and provides overvoltage protection while regulating output
current. Integrated drivers for power and load MOSFET switches and an adjustable feedback voltage (0V 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 synchronizable to an external
clock. Programmable soft-start limits inrush current during startup, preventing input current spikes.
The LTC3783 is rated for operation from -40ºC to 85ºC with a maximum junction temperature of 125ºC. It is
offered in 16-lead 5mm x 4mm DFN and TSSOP packages. 1,000-piece pricing starts at $2.85 each.
Summary of
Features: LTC3783
* True Color PWM Delivers Constant Color with 3000:1 Dimming Ratio
* Integrated MOSFET Driver for PWM Dimming Control
* 100:1 Dimming from Analog Input
* Constant Current or Constant Voltage Regulation
* 1% 1.23V Internal Voltage Reference
* Adjustable Output Voltage Protection & Soft-start
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Miércoles, 04 Enero, 2006 - 05:58 | |
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| LTC3783: High Power LED Driver with 3000:1 PWM Dimming Range Delivers
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