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dc1041a-af
DEMO MANUAL DC1041A-A
DESCRIPTION
LTM4601
5VIN to 20VIN, 12A Step-Down
µModule Regulator
Demonstration circuit DC1041A-A features the
LT M
®
4601EV, a 12A high efficiency, high density switch
mode step-down converter. The input voltage range is
from 4.5V to 20V. The output voltage is jumper select-
able for popular voltages from 0.6V to 5V. The PLLIN
pin supports synchronizing the μModule
®
regulator to
an external clock. The TRACK/SS pin allows the user to
program output ramp-up and ramp-down rates which
may coincidentally or ratiometrically track with another
supply’s output if desired. Output voltage margining of
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.
PERFORMANCE SUMMARY
BOARD PHOTO
±5% from the nominal value is available via the margin
control pins MARG0 and MARG1. The LTM4601 data sheet
must be read in conjunction with this demo manual prior
to working on or modifying demo circuit DC1041A-A.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA = 25°C)
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 20V
Output Voltage VOUT Jumper Selectable (Open for 0.6V) 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and
Thermal Conditions
12A DC
Default Operating Frequency 850kHz
External Synchronous Clock Frequency Range Refer to Data Sheet for Details 600kHz to 1000kHz
Efficiency VIN = 12V, VOUT = 1.5V, IOUT = 12A 83%, See Figure 2
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DEMO MANUAL DC1041A-A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1041A-A (DRVCC Bias Supply is Optional)
Demonstration circuit DC1041A-A is an easy way to evalu-
ate the performance of the LTM4601EV. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
1. With the power supply off, connect the input power
supply, load and meters as shown in Figure 1. Preset
the load to 0A and power supply voltage within the
LTM4601’s operating input voltage range.
2. Place jumpers in the following positions for a typical
1.5VOUT application:
MARG0 MARG1 RUN VOUT SELECT
LO LO ON 1.5V
3. Turn on the power at the input. The output voltage
should be 1.5V ± 1%.
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters. Output ripple should be measured at
J4 with a BNC cable.
5. For optional load transient test, apply an adjustable
pulse signal between IOSTEP (E3) and GND pins.
Pulse amplitude sets the current step. The pulse signal
should have very small duty cycle (<15%) to limit the
thermal stress on the transient load circuit. The output
transient current can be monitored at BNC connector
J3 (10mV/A).
6. For Margining function test, place jumper MARG0 and
MARG1 in the configurations shown in the following
table, measure the output voltage at J4.
MARG1 MARG0 ΔVOUT
LO LO 0
LO HI +5%
HI LO –5%
HI HI 0
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dc1041a-af
DEMO MANUAL DC1041A-A
QUICK START PROCEDURE
Figure 2. Measured Supply Efficiency with Different VIN and VOUT
Figure 3. Measured Load Transient Response (0A to 10A Step)
VIN = 12V
VOUT = 1.5V
0A TO 10A LOAD STEP
COUT = 1 × 22μF CERAMIC, 2 × 100μF CERAMIC, C5 = 47pF
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DEMO MANUAL DC1041A-A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 Cap., Alum 150μF 35V 20% SANYO 35ME150WXV (now SUNCON
35ME150WXV)
2 2 CIN2, CIN3 Cap., X7R 10μF 35V 20% Taiyo Yuden GMK316BJ106ML-T
3 2 COUT1, COUT2 Cap., X5R 100μF 6.3V 20% Taiyo Yuden JMK432BJ107MU-T
4 1 COUT4 Cap., X5R 10μF 10V 10% Taiyo Yuden LMK316BJ106KL-T
5 1 CSS Cap., X7R 0.1μF 16V 20% AVX 0603YC104MAT2A
6 1 R4 Res., Chip 392k 0.1W 1% AAC CR16-3923FM
7 2 R8,R5 Res., Chip 10Ω 0.1W 5% AAC CR16-100JM
8 1 R19 Res., Chip 30.1k 0.06W 1% AAC CR16-3012FM
9 1 U1 I.C., Volt. Reg. Linear Technology Corp. LTM4601EV
Additional Demo Board Circuit Components
1 0 CIN4, CIN5 Cap., 1206 TBD
2 0 COUT3 Cap., 1210 TBD
3 0 C3, C4, C5, C6, C7 Cap., 0603 TBD
4 2 C1, C2 Cap., X5R 1μF 10V 10% Taiyo Yuden LMK107BJ105KA
5 1 D1 Zener Diode, 5.1V On Semi. MMBZ5231B
6 1 Q1 MOSFET, N-Channel 30V Siliconix SUD50N03-10
7 0 R6, R9, R11, R12, R18 Res., 0603 TBD
8 2 R17, R1 Res., Chip 10k 0.1W 5% AAC CR16-103JM
9 1 R2 Res., LRC 0.010Ω 0.25W 1% IRC LRF1206-01-R010-F
10 1 R3 Res., Chip 51k 0.1W 5% AAC CR16-513JM
11 3 R7, R10, R23 Res/Jumper, Chip 0Ω 1/16W 1 AMP AAC CJ06-000M
12 1 R14 Res., Chip 49.9k 0.06W 1% AAC CR16-4992FM
13 1 R15 Res., Chip 60.4k 0.1W 1% AAC CR16-6042FM
14 1 R16 Res., Chip 40.2k 0.1W 1% AAC CR16-4022FM
15 1 R20 Res., Chip 19.1k 0.1W 1% AAC CR16-1912FM
16 1 R21 Res., Chip 13.3k 0.1W 1% AAC CR16-1332FM
17 1 R22 Res., Chip 8.25k 0.1W 1% AAC CR16-8251FM
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DEMO MANUAL DC1041A-A
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.
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1041A-A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0411 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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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. As a prototype, this product does not fall within the scope of the European Union
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If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
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