Datasheet LT3763 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 60V High Current Step-Down LED Driver Controller |
| Seiten / Seite | 30 / 1 — FEATURES. DESCRIPTION. Accurately Control Input and Output Current. … |
| Revision | C |
| Dateiformat / Größe | PDF / 1.0 Mb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Accurately Control Input and Output Current. 3000:1 True Color PWM™ Dimming
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LT3763 60V High Current Step-Down LED Driver Controller
FEATURES DESCRIPTION
n
Accurately Control Input and Output Current
The LT®3763 is a fixed frequency, synchronous, step-down n
3000:1 True Color PWM™ Dimming
DC/DC controller designed to accurately regulate output n
±1.5% Voltage Regulation Accuracy
currents up to 20A. The average current mode control- n
±6% Current Regulation Accuracy
ler will maintain inductor current regulation over a wide n 6V to 60V Input Voltage Range output voltage range from 0V to 55V. Output current is n Wide Output Range Up to 55V set by analog voltages on the CTRL pins and an external n <2µA Shutdown Current sense resistor. Voltage regulation and overvoltage protec- n Control Pin for Thermal Control of Load Current tion are set with a voltage divider from the output to the n Input and Output Current Monitor and Limit FB pin. The switching frequency is programmable from n Open, Short, and C/10 Fault Detection 200kHz to 1MHz through an external resistor on the RT n PWM Driver Output for LED Applications pin or with the SYNC pin and an external clock signal. n Thermally Enhanced 28-Lead FE Package Input and output current sensing provides input current limiting and an accurate measurement of these currents.
APPLICATIONS
The FBIN pin is provided for applications requiring a peak n power tracking function. High Power Architectural Lighting n Automotive Lighting Additional features include an accurate external reference n Aviation and Marine Strobe Lights voltage for use with the CTRL pins, an accurate UVLO/ n Solar-Powered Chargers, Laser Diodes EN pin that allows for programmable UVLO hysteresis, All registered trademarks and trademarks are the property of their respective owners. a PWM driver for LED applications, output voltage fault detection, and thermal shutdown.
TYPICAL APPLICATION 20A, Pulse Width Modulated, Single LED Driver
2.5mΩ VIN 10V TO 30V 100µF 84.5k 1k 1µF 1k 4.7µF 15.4k IVINP IVINN VIN
PWM Dimming
EN/UVLO TG VREF 220nF VOUT PWM 2.2µF 45.3k BOOST LT3763 1.5µH 2.5mΩ 6V, 20A MAXIMUM 10V/DIV CTRL2 SW 220µF VSW ×2 50V/DIV 470k INTVCC 47.5kΩ 22µF 10Ω 10Ω I 50k BG L CTRL1 5A/DIV GND FBIN 50Ω SENSE+ 5µs/DIV 3763 TA01b IVINMON 33nF 1nF SENSE– 50Ω PWMOUT ISMON 1nF PWM FAULT 47.5k SYNC FB RT SS VC 12.1k 82.5k 10nF 59k 3763 TA01 4.7nF Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Accurately Control Input and Output Current
The LT®3763 is a fixed frequency, synchronous, step-down n
3000:1 True Color PWM™ Dimming
DC/DC controller designed to accurately regulate output n
±1.5% Voltage Regulation Accuracy
currents up to 20A. The average current mode control- n
±6% Current Regulation Accuracy
ler will maintain inductor current regulation over a wide n 6V to 60V Input Voltage Range output voltage range from 0V to 55V. Output current is n Wide Output Range Up to 55V set by analog voltages on the CTRL pins and an external n <2µA Shutdown Current sense resistor. Voltage regulation and overvoltage protec- n Control Pin for Thermal Control of Load Current tion are set with a voltage divider from the output to the n Input and Output Current Monitor and Limit FB pin. The switching frequency is programmable from n Open, Short, and C/10 Fault Detection 200kHz to 1MHz through an external resistor on the RT n PWM Driver Output for LED Applications pin or with the SYNC pin and an external clock signal. n Thermally Enhanced 28-Lead FE Package Input and output current sensing provides input current limiting and an accurate measurement of these currents.
APPLICATIONS
The FBIN pin is provided for applications requiring a peak n power tracking function. High Power Architectural Lighting n Automotive Lighting Additional features include an accurate external reference n Aviation and Marine Strobe Lights voltage for use with the CTRL pins, an accurate UVLO/ n Solar-Powered Chargers, Laser Diodes EN pin that allows for programmable UVLO hysteresis, All registered trademarks and trademarks are the property of their respective owners. a PWM driver for LED applications, output voltage fault detection, and thermal shutdown.
TYPICAL APPLICATION 20A, Pulse Width Modulated, Single LED Driver
2.5mΩ VIN 10V TO 30V 100µF 84.5k 1k 1µF 1k 4.7µF 15.4k IVINP IVINN VIN
PWM Dimming
EN/UVLO TG VREF 220nF VOUT PWM 2.2µF 45.3k BOOST LT3763 1.5µH 2.5mΩ 6V, 20A MAXIMUM 10V/DIV CTRL2 SW 220µF VSW ×2 50V/DIV 470k INTVCC 47.5kΩ 22µF 10Ω 10Ω I 50k BG L CTRL1 5A/DIV GND FBIN 50Ω SENSE+ 5µs/DIV 3763 TA01b IVINMON 33nF 1nF SENSE– 50Ω PWMOUT ISMON 1nF PWM FAULT 47.5k SYNC FB RT SS VC 12.1k 82.5k 10nF 59k 3763 TA01 4.7nF Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts