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Linear DC1543A Demo Manual
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Linear DC1543A Demo Manual

Linear DC1543A Demo Manual

Ltm4641 38v, 10a, step-down mmodule regulator with advanced input and load protection
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DESCRIPTION
Demonstration circuit 1543A features the LTM
high efficiency, high density switch mode step-down power
μModule regulator with superior input and load protection
features. The input voltage range is from 4.5V to 38V. The
output voltage is jumper programmable from 0.8V to 6V
with a rated load current of 10A. Derating is necessary
for certain V
, V
IN
DC1543A offers the TRACK/SS pin allowing the user to
program output tracking or soft-start period. The DC1543A
allows the user to enable/disable input undervoltage
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Continuous Output Current
Default Operating Frequency
Efficiency
Load Transient
BOARD PHOTO
Arrow.com.
Downloaded from
38V, 10A, Step-Down µModule Regulator
with Advanced Input and Load Protection
, frequency and thermal conditions.
OUT
CONDITIONS
Jumper Selectable
Derating is Necessary for Certain Operating Conditions.
See Data Sheet for Details.
R
= 680kΩ for V
fSET
R
= ∞ (Not Stuffed) for V
fSET
V
= 12V, V
IN
OUT
V
= 12V, V
IN
OUT
DEMO MANUAL DC1543A
®
4641, a
protection; input latching/non-latching overvoltage protec-
tion; and latching/non-latching overtemperature protection.
Higher efficiency at low load currents is achieved by setting
the MODE pin jumper to DCM. The LTM4641 data sheet
must be read in conjunction with this demo manual prior
to working on or modifying demo circuit 1543A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
= 0.8V, 1.0V, 1.2V, 1.5V, 1.8V;
OUT
= 3.3V, 5.0V, 6.0V
OUT
= 6V, I
= 10A
OUT
= 3.3V
LTM4641
VALUE
4.5V to 38V
0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 3.3V, 5V, 6V; ±1.5%
10A
DC
255kHz (V
= 0.8V); 320kHz (V
OUT
OUT
385kHz (V
= 1.2V); 480kHz (V
OUT
OUT
575kHz (V
= 1.8V); 360kHz (V
OUT
OUT
550kHz (V
= 5.0V); 660kHz (V
OUT
OUT
93.0% See Figure 2
See Figure 3
= 1.0V);
= 1.5V);
= 3.3V);
= 6.0V);
dc1543afa
1

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Summary of Contents for Linear DC1543A

  • Page 1 The DC1543A allows the user to enable/disable input undervoltage L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    2. With power off, connect the input power supply, load tections, put the corresponding jumper in the “ON” and meters as shown in Figure 1. Preset the load to 0A position. For DC1543A, the thresholds for different and V supply to be 0V.
  • Page 3 – – Note: Demo circuit 1543A demonstrates a functional but outdated square pad layout for LTM4641. Refer to the design files recommending round pads for future PCB designs available at www.linear.com/demo. Figure 1. Proper Measurement Equipment Setup dc1543afa Arrow.com. Arrow.com.
  • Page 4 OUTPUT CURRENT (A) 2b. V = 12V 2d. V = 36V Figure 2. Measured DC1543A Efficiency at Different V and f (CCM Mode Enabled) Please refer to Table 1 in LTM4641 data sheet for the switching frequency at each output voltage. dc1543afa Arrow.com.
  • Page 5 DEMO MANUAL DC1543A QUICK START PROCEDURE : 50mV/DIV : 4A/DIV OUT_STEP 3a. V = 12V, V = 3.3V, 0A to 4A Load Step : 20mV/DIV : 4A/DIV OUT_STEP 3b. V = 12V, V = 1.0V, 0A to 4A Load Step Figure 3.

  • Page 6: Parts List

    DEMO MANUAL DC1543A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN2, CIN1 CAP ., Aluminum, 100μF , 50V SUN ELECT, 50CE100LX CIN3, CIN4 CAP ., X7R, 4.7μF , 50V, 10%, 1210 AVX, 12105C475KAT2A CO1, CO2, CO8 CAP ., POSCAP , 150μF , 10V, D3L...

  • 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.