DC1160A: 330mA @ 40V Max, 3 ~ 40V in

Summary

Demonstration circuit 1160 is a full-featured LED driver with 2.3A switch current featuring the LT®3518. The board is optimized to drive a 330mA LED string with a total LED voltage between the input voltage and 40V in a boost topology. The high input voltage range, high efficiency low side internal 2.3A NPN power switch, low voltage floating current sense amplifier, soft-start, high side PMOS PWM gate driver, high PWM dimming ratio, overvoltage protection, shutdown control pin, analog LED current dimming control, and externally programmable switching frequency (with sync) make the LT3518 an extremely versatile and powerful LED driving IC.

The LT3518 has a 45V switch with 2.3A peak switch current limit rating. DC1160 has overvoltage protection at 40V if the LEDs are open or not properly attached to the terminals on the PCB. The shutdown function is activated by pulling the shutdown terminal to ground.

The high side PMOS PWM dimming MOSFET can be used to achieve 3000:1 PWM dimming ratio. The board is programmed for 1MHz oscillator frequency, but can be adjusted by changing R14. Higher frequency results in higher PWM dimming ratio.

A few simple modifications can be made to DC1160 in order to convert the board from a boost LED driver to a buck mode or buck-boost mode LED driver. Please consult the data sheet for schematic details and the factory for customization details.

Specifications

Manufacturer Linear Technology/Analog Devices
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number DC1160A-ND
Eval Board Supplier Linear Technology/Analog Devices
Eval Board Normally In Stock
Voltage In 3 ~ 40 V
Topology Step Up
Current Out 330 mA
Voltage Out (Max) 40 V
Outputs and Type 1 Non-Isolated
Efficiency @ Conditions >88%, 12V in, 30V @ 330 mA
Features Dimming Control
Open Circuit Protection
Over Voltage Protection
Shutdown, Enable, Standby
Soft Start
Synchronizable
Switching Frequency 1 MHz
Component Count + Extras 14 + 16
Design Author Linear Technology
Application / Target Market Automotive
LCD Backlighting
LED Signage
Main I.C. Base Part LT3518
Date Created By Author
Date Added To Library 2011-04

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