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Datasheet Linear Technology LT3743IFE#PBF

Manufacturer:Linear Technology
Series:LT3743
Part Number:LT3743IFE#PBF

High Current Synchronous Step-Down LED Driver with Three-State Control

Datasheets

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    FEATURES LT3743 High Current Synchronous Step-Down LED Driver with Three-State Control DESCRIPTION
    The LT3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN 2V). LED dimming is achieved through analog dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several s, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin. Additional features include voltage regulation and overvoltage protection set with a voltage divider from the output to the FB pin. Overcurrent protection is provided and set by the CTRL_H pin.
    L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203, 8120335 and others pending. n n PWM Dimming Provides Up to 3000:1 Dimming Ratio CTRL_SEL Dimming Provides Up to 3000:1 Dimming Ratio Between Any Current Three-State Current Control for Color Mixing 6% Current Regulation Accuracy 6V to 36V Input Voltage Range Average Current Mode Control 2s Maximum Recovery Time Between Any Current Regulation State <1A Shutdown Current Output Voltage Regulation and Open-LED Protection Thermally Enhanced 4mm 5mm QFN and 28-Pin FE Package APPLICATIONS n DLP Projectors High Power Architectural Lighting Laser Diodes TYPICAL APPLICATION
    92% Efficient 20A LED Driver
    EN/UVLO PWM CTRL_SEL 82.5k EN/UVLO PWM CTRL_SEL RT SYNC VREF LT3743 100k 100k CTRL_L CTRL_H CTRL_T RNTC 10k 10nF SS VIN 1F HG CBOOT 2.2nF RHOT 499 SW M1 220nF 1.1H 2.5m OUTPUT 20A MAXIMUM 4.7F 22F M2 330F 3 330F 3 ILED 10A/DIV 4.7F 4 VIN 10V TO 30V CTRL_SEL 5V/DIV PWM 5V/DIV SW 20V/DIV VCC_INT LG GND SENSE+ SENSE PWMGH PWMGL M3 M4 51.1k FB VCL 34k 8.2nF VCH
    3743 TA01a VIN = 24V 20s/DIV 0A TO 2A TO 20A LED CURRENT STEP 3743 TA01b 330F 3 M1, M2: SiR462DP M3, M4: Si7234DP 10.0k 34k 8.2nF 3743fd 1 LT3743 ABSOLUTE MAXIMUM RATINGS (Note 1)
    VIN Voltage .40V EN/UVLO Voltage .6V VREF Voltage .3V CTRL_L, CTRL_H, CTRL_T Voltage .3V PWM, CTRL_SEL Voltage .6V SENSE+ Voltage .40V SENSE Voltage .40V VCH, VCL Voltage .3V SW Voltage .4 ...

Other Names: LT3743IFEPBF, LT3743IFE PBF

Docket:
FEATURES LT3743 High Current Synchronous Step-Down LED Driver with Three-State Control DESCRIPTION
The LT3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN 2V). LED dimming is achieved through analog dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several s, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin. Additional features include vol...

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