DC2240A: 5V or -5V @ 5A, 10 ~ 14V in

Summary

Demonstration circuit 2240A is a synchronous four quadrant converter featuring the LT®8714 switching controller. The LT8714 can regulate to positive, negative, or zero volts when configured as a four-quadrant topology. The DC2240A regulates from a 10V to 14V input source to an adjustable output voltage from positive 5V to negative 5V with a 5A maximum current rating, and operates at 200kHz switching frequency.

The LT8714 incorporates a power good feature to let the user know if the output voltage is within its target regulation voltage.

The LT8714 has an output voltage control (CTRL) pin which sets the output voltage. The DC2240A has a jumper to select the CTRL pin voltage source from either externally (EXT) or internally (INT). If selected internally, the output voltage can be set to +5V or –5V. If selected externally, the output voltage can vary between positive 5V and negative 5V, following a 0.1V – 1V CTRL signal with high bandwidth.

The LT8714 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2240A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC2240A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Inverting
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	5 V -5 V
Current Out	5 A
Voltage In	10 ~ 14 V
Efficiency @ Conditions	>90%, 10V in, +5V @ 1.1 ~ 5 A >89%, 12V in, +5V @ 1.3 ~ 5 A >85%, 14V in, +5V @ 1.5 ~ 5 A >81%, 10V in, -5V @ 1.3 ~ 5 A >80%, 12V in, -5V @ 2 ~ 5 A >76%, 14V in, -5V @ 2 ~ 5 A
Voltage Out Range	-5 V to +5 V
Features	Current Limit (Adj. or Fixed) Power Good Output Shutdown, Enable, Standby Synchronizable Under Voltage Protection, Brown-Out
Switching Frequency	100 ~ 750 kHz
Standby Current [Typical]	0 µA
Quiescent Current [Typical]	4 mA
Component Count + Extras	46 + 17
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Power: Auxiliary Power Supply Test and Measurement Equipment
Standby Current [Maximum]	1 µA
Quiescent Current [Maximum]	5.5 mA
Main I.C. Base Part	LT8714
Date Created By Author	2015-10
Date Added To Library	2016-03