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LT3743EFEPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3743EFEPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3743 1 3743fb TYPICAL APPLICATION DESCRIPTION High Current Synchronous Step-Down LED Driver with Three-State Control The LT®3743 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 μs, 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. 92% Efficient 20A LED Driver FEATURES APPLICATIONS n PWM Dimming Provides Up to 3000:1 Dimming Ratio n CTRL_SEL Dimming Provides Up to 3000:1 Dimming Ratio Between Any Current n Three-State Current Control for Color Mixing n ±6% Current Regulation Accuracy n 6V to 36V Input Voltage Range n Average Current Mode Control n 2μs Maximum Recovery Time Between Any Current Regulation State n <1μA Shutdown Current n Output Voltage Regulation and Open-LED Protection n Thermally Enhanced 4mm × 5mm QFN and 28-Pin FE Package n DLP Projectors n High Power Architectural Lighting n Laser Diodes EN/UVLO PWM CTRL_SEL EN/UVLO PWM CTRL_SEL HG VIN CBOOT VREF CTRL_L CTRL_H CTRL_T LT3743 RT SYNC SW LG GND VCH VCL SENSE+ SENSE– PWMGH PWMGL VCC_INT 220nF 1.1μH 22μF 330μF 3 2.5mΩ FB 10nF 34k 8.2nF 34k 8.2nF 82.5k 100k 100k 330μF 3 51.1k 3743 TA01a 10.0k 4.7μF 330μF 3 2.2nF RNTC 10k 4.7μF 4 VIN 10V TO 30V OUTPUT 20A MAXIMUM 1μF M1 M2 SS RHOT 499Ω M3 M4 M1, M2: SiR462DP M3, M4: Si7234DP CTRL_SEL 5V/DIV PWM 5V/DIV SW 20V/DIV ILED 10A/DIV 20μs/DIV 3743 TA01b VIN = 24V 0A TO 2A TO 20A LED CURRENT STEP 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 and others pending. |
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