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Linear Technology DC1504A Demo Manual

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DESCRIPTION
Demonstration circuit 1504A features the LT4180, a virtual
remote sense controller which eliminates the need for
remote sense wires to compensate for IR losses in cables
and wires, and is used in conjunction with the LT3693
buck converter. The circuit is designed for an input voltage
range of 8V to 36V with an output of 5V at 3A. The circuit
board has a total wire resistance of 0.4Ω and a voltage
drop of 1.2V. The circuit contains five selectable jumpers.
JP1 turns the converter ON or Off, JP2-JP4 allow for easy
selection of other dither frequency combinations, and
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage Accuracy
OUT
Ripple
f
Buck Switching Frequency
S
QUICK START PROCEDURE
Demonstration circuit 1504A is easy to set up to evalu-
ate the performance of the LT4180. Refer to Figure 2 for
proper equipment setup and follow the procedure below.
When input or output voltage ripple is measured, care
must be taken to avoid a long ground lead on the oscil-
loscope probe. Measure the input or output voltage ripple
by touching the probe tip directly across the V
and GND terminals. See Figure 2 for proper scope probe
technique.
DEMO MANUAL DC1504A
Virtual Remote Sense Controller
JP5 enables or disables spread spectrum operation. The
LT4180 data sheet gives a complete description of the part,
its operation and application information. The data sheet
must be read in conjunction with this quick start guide for
working on or modifying the demo circuit 1504A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
(T
= 25°C)
A
CONDITIONS
V
= 8V to 36V, I
= 3A
IN
LOAD
V
= 12V, I
= 3A
IN
LOAD
1. Place jumpers in the following position:
JP1 On
JP2 Low
JP3 High
JP4 High
or V
IN
OUT
JP5 Low
LT4180
MIN
TYP
MAX
8
36
4.8V
5
5.2V
50
500
dc1504af
UNITS
V
V
mV
KHz
1

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Summary of Contents for Linear Technology DC1504A

  • Page 1 1.2V. The circuit contains five selectable jumpers. JP1 turns the converter ON or Off, JP2-JP4 allow for easy L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear selection of other dither frequency combinations, and Technology Corporation.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1504A QUICK START PROCEDURE 2. With power off, connect the input power supply to V NOTE. If there is no output, temporarily disconnect the and GND. load to make sure that the load is not set too high.
  • Page 3 DEMO MANUAL DC1504A QUICK START PROCEDURE POWER SOURCE – Figure 2. Proper Equipment Setup Figure 3. Proper Input/Output Ripple Measurement Technique dc1504af...
  • Page 4 DEMO MANUAL DC1504A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components for DC1504A C7, C8 CAP , 7343 470μF 20% 10V TANT AVX TPSE477M010R0050 CAP , 1206 0.47μF 10% 50V X7R TDK C3216X7R1H474K CAP , 22μF 50V ALUM SUN ELECT.

  • Page 5: 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 6 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.