Summary of LT3763 – 60V High Current Step-Down LED Driver Controller
The LT3763 is a fixed-frequency, synchronous step-down DC/DC controller capable of regulating output currents up to 20A. It features average current mode control for wide voltage ranges (0V to 55V), programmable switching frequencies via an external resistor or clock signal, and precise input/output current sensing. Additional capabilities include peak power tracking, UVLO with hysteresis, PWM drivers for LEDs, and comprehensive fault protection like thermal shutdown.
Parts used in the LT3763 Project:
- LT3763 Controller
- External Sense Resistor
- Voltage Divider
- External Resistor on RT Pin
- Synchronization Clock Signal
- FBIN Pin Circuitry
- UVLO/EN Pin
- PWM Driver
Description
The LT3763 is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A. The average current mode control- ler will maintain inductor current regulation over a wide output voltage range from 0V to 55V. Output current is set by analog voltages on the CTRL pins and an external sense resistor.
Voltage regulation and overvoltage protection are set with a voltage divider from the output to the FB pin. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin or with the SYNC pin and an external clock signal. Input and output current sensing provides input current limiting and an accurate measurement of these currents. The FBIN pin is provided for applications requiring a peak power tracking function.
Additional features include an accurate external reference voltage for use with the CTRL pins, an accurate UVLO/EN pin that allows for programmable UVLO hysteresis, a PWM driver for LED applications, output voltage fault detection, and thermal shutdown.
For more detail: LT3763 – 60V High Current Step-Down LED Driver Controller
- What is the maximum output current the LT3763 can regulate?
The controller accurately regulates output currents up to 20A. - How is the switching frequency programmed?
It is set from 200kHz to 1MHz using an external resistor on the RT pin or via the SYNC pin with an external clock signal. - Can the LT3763 handle a 0V output voltage?
Yes, the average current mode controller maintains regulation over a wide range from 0V to 55V. - How is output current set in this design?
Output current is determined by analog voltages on the CTRL pins and an external sense resistor. - Does the device support peak power tracking?
Yes, the FBIN pin is provided for applications requiring a peak power tracking function. - What protection features are included?
Features include input current limiting, output voltage fault detection, thermal shutdown, and overvoltage protection. - Is the UVLO/EN pin programmable?
Yes, it allows for programmable UVLO hysteresis. - Can the LT3763 be used for LED applications?
Yes, it includes a dedicated PWM driver specifically for LED applications.
