DESCRIPTION
Demonstration circuit 2244A features the
SEPIC or inverting μModule
is configured as two stand-alone DC/DC converters with
+12.0V and –12V output voltages from an input voltage
up to 20V. The switching frequencies of both channels
are set at 1MHz on DC2244A. The frequency foldbacks
when the output is 15% below the target regulation point
during a fault or output overload, thus protects the power
switch from damage.
Both channels can be configured as either SEPIC or in-
verting by simply grounding the appropriate output rail,
component change, and/or PCB board cut. The maximum
output current of each channel varies with the input voltage,
BOARD PHOTO
Arrow.com.
Downloaded from
LTM
8049, a dual
®
regulator. The demo circuit
®
DEMO MANUAL DC2244A
Dual SEPIC or Inverting
µModule DC/DC Converter
and is 1A at 12V
. The two channels can be paralleled
IN
for higher output current with SHARE1, SHARE2 pins tied
together. See the Quick Start Procedure for more informa-
tion on the modification of the board, and paralleling of
two outputs.
The LTM8049 data sheet gives complete description of
the device, operation and application information. The data
sheet must be read in conjunction with this demo manual
prior to working on or modifying demo circuit 2244A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2244A
L, LT, LTC, LTM, Linear Technology and the Linear logo and μModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM8049
dc2244afa
1
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