Linear Technology uModule DC2244A Demo Manual

Ltm8049 dual sepic or inverting dc/dc converter

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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.
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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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Summary of Contents for Linear Technology uModule DC2244A

  • Page 1 PCB board cut. The maximum L, LT, LTC, LTM, Linear Technology and the Linear logo and μModule are registered output current of each channel varies with the input voltage, trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
  • Page 2: Performance Summary

    DEMO MANUAL DC2244A PERFORMANCE SUMMARY Specifications are at T = 25°C SYMBOL PARAMETER CONDITIONS UNITS Input Supply Range Switching Frequency = 12V, I = 1A OUT1 Output Voltage of Channel 1, SEPIC 11.75 12.25 OUT1 Maximum Output Current of Channel 1 = 12V OUT1 (AC)
  • Page 3 DEMO MANUAL DC2244A QUICK START PROCEDURE Figure 1. DC2244A Proper Equipment Setup or V Figure 2. Measuring Input or Output Ripple dc2244afa Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC2244A QUICK START PROCEDURE Figure 3. Change the Boards to (a) Two Negative Outputs, (b) Two Positive Outputs dc2244afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 5 DEMO MANUAL DC2244A QUICK START PROCEDURE (a) V = 12V (b) V = 20V Figure 4. DC2244A Thermal Performance (12V = 0.7A, T = 25°C) OUT1 OUT2 = 12V =1MHz, CHANNEL 1 = 1.5MHz, CHANNEL 1 LOAD CURRENT, CHANNEL 1 (A) DC2244A F05 Figure 5.
  • Page 6: Parts List

    DEMO MANUAL DC2244A QUICK START PROCEDURE –5 DATA –10 CLASS 5 PEAK –15 1000 FREQUENCY (MHz) DC2244A F07 Figure 7. Radiated EMI CISPR25- Class 5 Peak Limit (Vertical Polarization) with 0.7A Load Current. (V = 14V) PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components...
  • Page 7: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 8 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.

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