DC1666A: 2A @ 25V Max, 4.7 ~ 60V in

Summary

Demonstration circuit DC1666A is a synchronous four switch buck-boost LED driver controller. It accepts an input voltage from 4.7V to 60V, and drives up to 25V of LEDs at 2A. DC1666A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed and it has a SHORTLED flag that indicates that the output has been shorted to GND. In both cases, the IC remains in control and well protected.

Demonstration circuit DC1666A accepts an input voltage from 4.7V to 60V, and drives up to 25V of LEDs at 2A. DC1666A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed and it has a SHORTLED flag that indicates that the output has been shorted to GND. In both cases, the IC remains in control and well protected.

Modifications can be made to DC1666A in order to convert the board to higher or lower power or from an LED driver to a constant voltage regulator or battery charger. Please consult the factory or the LT3791 data sheet for details.

Specifications

Manufacturer	Analog Devices Inc.
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	DC1666A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Voltage In	4.7 ~ 60 V
Topology	Step Down Step Up Step Up/Down
Current Out	2 A
Voltage Out (Max)	25 V
Outputs and Type	1 Non-Isolated
Efficiency @ Conditions	>96%, 12 ~ 36V in, 25V of LEDs @ 2 A
Features	Current Foldback Protection Dimming Control Open Circuit Protection Over Voltage Protection Short Circuit Protection Shutdown, Enable, Standby Synchronizable Under Voltage Protection, Brown-Out
Switching Frequency	300 kHz
Component Count + Extras	29 + 37
Design Author	Linear Technology
Application / Target Market	Automotive Lighting: LED Commercial Lighting Lighting: LED Solar Streetlight
Main I.C. Base Part	LT3791
Date Created By Author	2012-03
Date Added To Library	2012-05