LTC3783 Datasheet | Linear Technology

Features PWM LED Driver and Boost, Flyback and SEPIC Controller DESCRIPTION n True Color PWMTM Delivers Constant Color with 3000:1 Dimming Ratio n Fully Integrated Load FET Driver for PWM Dimming Control of High Power LEDs n 100:1 Dimming from Analog Inputs n Wide FB Voltage Range: 0V to 1.23V n Constant Current or Constant Voltage Regulation n Low Shutdown Current: IQ = 20µA n 1% 1.23V Internal Voltage Reference n 2% RUN Pin Threshold with 100m V Hysteresis n Programmable Operating Frequency (20k Hz to 1MHz) with One External Resistor n Synchronizable to an External Clock Up to 1.3f OSC n Internal 7V Low Dropout Voltage Regulator n Programmable Output Overvoltage Protection n Programmable Soft-Start n Can be Used in a No RSENSETM Mode for VDS < 36V n 16-Lead DFN and TSSOP Packages APPLICATIONS n High Voltage LED Arrays n Tele Power Supplies n 42V Automotive Systems n 24V Industrial Controls n IP Phone Power Supplies , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM and No RSENSE are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC®3783 is a current mode LED driver and boost, flyback and SEPIC controller that drives both an N-channel power MOSFET and an N-channel load PWM switch. When using an external load switch, the PWMIN input not only drives PWMOUT, but also enables controller GATE switching and error amplifier operation, allowing the controller to store load current information while PWMIN is low. This feature (patent pending) provides extremely fast, true PWM load switching with no transient overvoltage or undervoltage issues; LED dimming ratios of 3000:1 can be achieved digitally, avoiding the color shift normally associated with LED current dimming. The FBP pin allows analog dimming of load current, further increasing the effective dimming ratio by 100:1 over PWM alone. In applications where output load current must be returned...