Linear Technology DC1198A-B Quick setup guide

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DEMO MANUAL DC1198A-B
DESCRIPTION
LTM4607EV: High Density
Buck-Boost Power Module
Demonstration circuit DC1198A-B features the
LT M
®
4607EV, a high efficiency, high density switch mode
buck-boost power module. The LTM4607EV can regulate
its output voltage from input voltage both above and below
the output. The board accepts an input voltage from 6V
to 36V and is set for an output voltage of 12V. The rated
load current is 5A in boost mode and 12A in step-down
operation. Derating is necessary for certain VIN, VOUT
and thermal conditions. The switching frequency can be
synchronized to external clock operating from 200kHz to 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.
PARAMETER CONDITION VALUE
Input Voltage Range 6V to 36V
Output Voltage VOUT DC Voltage, VIN = 12V, IOUT = 5A 12V, ±2%
Maximum Continuous Output Current Step-Up
Step-Down
Derating Is Necessary for Certain VIN, VOUT and Thermal Conditions
5ADC (6VIN)
12ADC (VIN > 12V)
Default Operating Frequency 300kHz
Efficiency VIN = 12V, VOUT = 12V, IOUT = 5A 97.4%, See Figure 3 for More
Information
BOARD PHOTO
PERFORMANCE SUMMARY
400kHz. This clock input can be used to reduce undesir-
able frequency harmonics and reduce input and output
ripple when paralleling LTM4607 modules for even higher
output current. The LTM4607 data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit DC1198A-B.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at TA= 25°C

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DEMO MANUAL DC1198A-B
QUICK START PROCEDURE
Demonstration circuit DC1198A-B provides a simple way
to evaluate the performance of the LTM4607EV. Please
refer to Figure 1 for the proper measurement equipment
set-up, and follow the procedure below:
1. Place jumpers in the following positions for a typical
12VOUT application:
RUN CLOCK MODE START
On Prog CCM SSO
2. With the power off, preset the load to 0A and the VIN
supply to less than 36V. Next, connect the input power
supply, load and meters, as shown in Figure 1.
3. Turn on the power at the input. The output voltage
should be 12V, ±2%.
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. The cooling fan and lower cur-
rent sensing resistor are necessary for VIN < 6V and
IOUT = 5A.
5. To measure the input and output ripple, please refer
to Figure 2 for the proper set-up.
6. The voltage at PLLFLTR determines the switching
frequency. Modify R6 and R7 to adjust the switching
frequency. Do not allow the voltage at pin PLLFLTR
to exceed 2.4V.
7. Inductor and RSENSE should be modified to accom-
modate certain input and output conditions. Please
refer to Table 1 for recommended inductors.
Figure 1. Test Set-Up of the DC1198A-B
INPUT OR OUTPUT CAPACITOR
+ –
Figure 2. Proper Scope Probe Placement for
Measuring Input or Output Ripple
VIN
DC1198AB F01
0A TO 5A
LOAD
+
–
+
–
+
–
+
–
+
–

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DEMO MANUAL DC1198A-B
LOAD CURRENT (A)
0
60
EFFICIENCY (%)
80
2 4 86
100
70
90
10
DC1198AB F03
VIN = 6V
VIN = 12V
VIN = 32V
QUICK START PROCEDURE
Figure 3. Measured Supply Efficiency
with Different VIN Figure 4. Measured Load Transient Response
(2.5A Step, 25% to 75%)
200µs/DIV
VO(AC)
100mV/DIV
ISTEP
2A/DIV
DC1198AB F04
VIN = 6V, VOUT = 12V
CONTINUOUS CURRENT MODE (CCM)
1.25A TO 3.75A LOAD STEP
COUT = 2 ×22µF CERAMIC (1812, X7R, 16V),
2 × 180µF OSCON 16V
VOOVERSHOOT AND UNDERSHOOT = 413mV
Table 1. Recommended Inductors for Different Input and Output Conditions: fSW = 400kHz
VIN
(V)
VOUT
(V)
RSENSE
(0.5W RATING)
INDUCTOR
(µH)
IOUT(MAX)*
(A) INDUCTOR
12 8 2 × 18mΩ, 0.5W 2.2 12 FDA1254-2R2M Toko CDEP134-2R5 Sumida
20 8 2 × 18mΩ, 0.5W 3.3 12 FDA1254-3R3M Toko CDEP145-3R5 Sumida
5 10 2 × 14mΩ, 0.5W 1.5 6 FDA1254-1R2M Toko CDEP134-1R6 Sumida
15 10 2 × 18mΩ, 0.5W 2.2 12 FDA1254-2R2M Toko CDEP134-2R5 Sumida
20 10 2 × 18mΩ, 0.5W 3.3 12 FDA1254-3R3M Toko CDEP145-3R5 Sumida
6 12 2 × 14mΩ, 0.5W 2.2 6 FDA1254-2R2M Toko CDEP134-2R5 Sumida
16 12 2 × 18mΩ, 0.5W 2.2 12 FDA1254-2R2M Toko CDEP134-2R5 Sumida
20 12 2 × 18mΩ, 0.5W 3.3 12 FDA1254-3R3M Toko CDEP145-3R5 Sumida
5 16 2 × 14mΩ, 0.5W 2.2 4 FDA1254-2R2M Toko CDEP134-2R5 Sumida
8 16 2 × 18mΩ, 0.5W 3.3 5 FDA1254-3R3M Toko CDEP145-3R5 Sumida
12 16 2 × 22mΩ, 0.5W 3.3 6 FDA1254-3R3M Toko CDEP145-3R5 Sumida
20 16 2 × 22mΩ, 0.5W 2.5 10 FDA1254-2R2M Toko CDEP134-2R5 Sumida
* Note: Per the manufacturer’s specification sheet, Toko FDA1254 inductors are not recommended for VIN > 30V. Please visit Toko’s website for
more information.
Table 2. RSENSE Vendors
RSENSE VENDOR PART NUMBER
Vishay Power Metal Strip Resistors WSL1206, 0.5W
Panasonic Thick Film Chip Resistors ERJ12, 0.5W

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DEMO MANUAL DC1198A-B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 Cap., Alum, 100µF, 20%, 50V Sanyo 50ME100WXV+TS
2 2 CIN2, CIN3 Cap., X5R, 4.7µF, 10%, 50V, 1206 Taiyo Yuden UMK316BJ475KL-T
3 1 CSS Cap., X7R, 0.01µF, 25V, 10%, 0603 AVX 06033C103KAT4A
4 2 CO3, CO4 Cap., X7R, 22µF, 16V, 20%, 1812 TDK C4532X7R1C226M
5 2 CO5, CO6 Cap., OS-CON, 180µF, 16V Sanyo 16SVP180MX
6 1 L1 Ind. Iron Power Smt Fixed, 4.7µH Toko FD1254-4R7M
7 1 R5 Res., Chip, 7.15k, 1/16W, 1%, 0603 Vishay CRCW06037K15FKEA
8 1 R6 Res., Chip, 4.64k, 1/16W, 1%, 0603 Vishay CRCW06034K64FKEA
9 1 R7 Res., Chip, 1.21k, 1/16W, 1%, 0603 Vishay CRCW06031K21FKEA
10 2 RS1, RS2 Res., Chip, 0.015 1/2W, 1%, 1206 IRC LRC-LRF1206-01-R015-F
11 1 U1 IC, LTM4607EV#PBF,
15mm × 9mm × 2.3mm LGA
Linear Technology Corporation, LTM4607EV#PBF
Additional Demo Board Circuit Components
1 0 CIN4, CIN5 (Opt) Cap., 1206
2 0 C2, C4, C5, CP, CFF (Opt) Cap., 0603
3 0 CO1, CO2 (Opt) Cap., SVP, 100µF, D3L
4 0 CO7 (Opt) Cap., 1206, 16V
5 0 CO8 (Opt) POSCAP, D3L
6 2 D1, D2 Zener Diode, 4.7V Central Semi., CMDZ5230B-7-F
7 1 R1 Res., Chip, 100k, 1/16W, 5%, 0603 Vishay, CRCW0603100KJNEA
8 1 R2 Res., Chip, 51k, 1/16W, 5%, 0603 Vishay, CRCW060351K0JNEA
9 1 R8 Res., Chip, 20k, 1/16W, 1%, 0603 Vishay, CRCW060320K0FKEA
10 1 RS3 (Opt) Res.,1206
11 1 R9, RUVLO (Opt) Res., 0603
Hardware, for Demo Board Only
1 2 JP1, JP2 2mm Single Row Header, 3 Pin Samtec, TMM-103-02-L-S
2 2 JP3, JP4 2mm Single Row Header,, 4 Pin Samtec, TMM-104-02-L-S
3 4 JP1, JP2, JP3, JP4 Shunt Samtec, 2SN-BK-G
4 10 TP1, TP4, TP5, TP7, TP9,
TP11-TP15
Testpoint, Turret, 0.095" Mill-Max, 2501-2-00-80-00-00-07-0
5 4 TP2, TP3, TP8, TP10 Banana Jack Keystone, 575-4
6 4 Stand-Off Stand-Off, Nylon, 0.50" Tall Keystone, 8833 (Snap On)

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DEMO MANUAL DC1198A-B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, noresponsibility is assumed for its use. Linear Technology Corporation makes no representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM

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DEMO MANUAL DC1198A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0910 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
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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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