Linear Technology DC2154A Quick setup guide

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dc2154af
DEMO MANUAL DC2154A
DESCRIPTION
LTM8056
58VIN, 48VOUT Buck-Boost
μModule Regulator
Demonstration circuit 2154A features the LT M
®
8056, a
buck-boost μModule
®
regulator that accepts input volt-
ages lower, higher or the same as the output, but is also
highly efficient due to its four-switch architecture. The
output for DC2154A is 24V and the input voltage range
is 7V to 58V. The maximum output current is 3A and the
switching frequency is 525kHz.
DC2154Asupportstheadjustable and controllable features
of the LTM8056 including output voltage and current
regulation, switching frequency, RUN threshold, soft-start
period, synchronization and reverse inductor current in-
hibit. In most cases, adjustment is made by modifying the
appropriate resistor or capacitor component(s). DC2154A
provides output current monitoring and a clock output.
L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
Input current monitoring and regulation requires the in-
stallation of a current sense resistor. The SVIN input for
controller power can be made a diode-OR of power VIN
and the output voltage to extend the operating range of
power VIN to lower voltages. There are places to mount
optional components that add an LC input filter and also a
unity gain buffer to operate multiple DC2154As in parallel.
The LTM8056 data sheet must be read in conjunction with
this demo manual to properly use or modify DC2154A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2154A
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX
Minimum Input Voltage, VIN 7V
Maximum Input Voltage, VIN 58V
Maximum Output Current, IOUT 24V < VIN <58V, CTL = OPEN
VIN =7V, CTL = OPEN
3A
1A
Input Turn-On Voltage, VIN R10 = 332k, R11 = 86.6k, VIN Rising 6.8V
Input Turn-Off Voltage, VIN R10 = 332k, R11 = 86.6k, VIN Falling 5.8V
Output Voltage, VOUT 100mA < IOUT < 3A (See Figure 2), R2 = 5.23k,
R3 = 100k 1%, R4 = 0.015Ω
23.4V 24.8V
Efficiency VIN =48V, IOUT = 3A 93%
Switching Frequency R1 = 43.2k 525kHz
Output Current Limit R4 = 0.015Ω 3.6A

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dc2154af
DEMO MANUAL DC2154A
QUICK START PROCEDURE
BOARD PHOTO
To use DC2154A to evaluate the performance of the
LTM8056, refer to Figure 1 for the proper measurement
equipment setup, Figure 2 for the maximum output current
versus input voltage and then follow the procedure below:
NOTE: Do not hot-plug the VIN terminal at high input
voltages. The absolute maximum voltage on VIN is 60V
and hot-plugging a power supply through wire leads to
the demonstration circuit can cause the voltage on the
extremely low ESR ceramic input capacitor to ring to
twice its DC value. In order to protect the LTM8056, an
aluminum electrolytic capacitor with higher ESR is placed
at the input terminals. This may protect against some, but
not all, input transientsdue to a hot-plugged power supply.
See Application Note 88 for more details.
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly to terminals across
the VIN or VOUT capacitors. See Figure 3 for proper scope
probe technique. Solder terminals near the input or output
capacitors, if necessary.
1. Connect the RUN terminal to ground with a clip-on lead.
Connect the power supply (with power off), load, and
meters as shown in Figure 1.
2. After all connections are made, turn on the input power
and verify that the input voltage is between 7V and 58V.
3. Remove the clip-on lead from RUN. Verify that VOUT
is24V.
NOTE: If VOUT is too low, temporarily disconnect the load
to make sure that the load is not set too high.
Once the proper output voltage is established, adjust the
input voltage and load within the operating range and
observe the output voltage regulation, ripple voltage, ef-
ficiency and other parameters.

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dc2154af
DEMO MANUAL DC2154A
Figure 1. Proper Measurement Equipment Setup
QUICK START PROCEDURE

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dc2154af
DEMO MANUAL DC2154A
QUICK START PROCEDURE
Figure 2. Maximum Output Current vs Input Voltage for VOUT = 24V
Figure 3. Proper Scope Probe Technique
VIN (V)
OUTPUT CURRENT (A)
6
5
4
0
3
2
1
2154A F02
30 40 500
10
20
24VOUT
R4 = 0.015Ω
R4 = SHORT
VOUT GND
C17

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dc2154af
DEMO MANUAL DC2154A
Figure 4. VOUT Noise Spectrum (VIN = 48V, VOUT = 24V at 3A)
QUICK START PROCEDURE
FREQUENCY (MHz)
0
INTENSITY (dBm)
0
–20
–60
–100
–40
–80
–120 2.51.51 3.5
2154A F04
520.5 3 4.54

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dc2154af
DEMO MANUAL DC2154A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C2, C3 CAP., X7R, 2.2μF, 100V, 10% 1206 MURATA, GRM31CR72A225KA73L
2 1 C5 CAP., X7R, 0.22μF, 16V, 10% 0603 TDK, C1608X7R1C224K
3 1 C4 CAP., X7R, 0.01μF, 16V, 10% 0603 MURATA, GRM188R71C103KA01D
4 2 C7, C8 CAP., X5R, 22μF, 25V, 20% 0805 MURATA, GRM21BR61E226ME44L
5 2 C6, C9 CAP., TANTALUM, 15μF, 50V, 20% 7343 AVX, TPSE156M050R0250
6 1 R1 RES., CHIP, 43.2k, 1/10W, 1% 0603 VISHAY, CRCW060343K2FKEA
7 1 R2 RES., CHIP, 5.23k, 1/10W, 1% 0603 VISHAY, CRCW06035K23FKEA
8 1 R3 RES., CHIP, 100k, 1/10W, 1% 0603 VISHAY, CRCW0603100KFKEA
9 1 R4 RES., CHIP, 0.015Ω, 0.5W, 1%, 2010 VISHAY, WSL2010R0150FEA
10 1 U1 58VIN BUCK-BOOST μMODULE REGULATOR LINEAR TECH., LTM8056EY#PBF
Optional Demo Circuit Components
1 1 C14 CAP., ALUM. ELEC., 47μF, 63V 8 x 10.2 SUN ELECT., 63CE47BS
2 0 C10, C15, C18, C19 (OPT) CAP., 0603
3 0 C11 (OPT) CAP., X7R, 1μF, 100V, 10% 1206 TDK, C3216X7R2A105K160AA
4 0 C12, C13, C16 (OPT) CAP., 1210
5 1 C17 CAP., X7R, 0.1μF, 25V, 10% 0603 MURATA, GRM188R71E104KA01D
6 0 D1, D2 (OPT) DIODE, OPTION, SOD-123
7 0 L1, L2 (OPT) INDUCTOR, 10μH SUMIDA, CDRH8D43NP-100NC
8 0 R5, R9, R13, R14, R15 (OPT) RES., CHIP, 0603
92 R6, R7 RES., CHIP, 0Ω, 1/10W, 1% 0603 VISHAY, CRCW0603000Z0EA
10 0 R8 (OPT) RES., OPTION, 2010
11 1 R10 RES., 332k, 1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA
12 1 R11 RES., CHIP, 86.6k, 1/10W, 1% 0603 VISHAY, CRCW060386K6FKEA
13 1 R12 RES., CHIP, 20Ω, 1/10W, 5% 0603 VISHAY, CRCW060320R0JNEA
14 0 U2 (OPT) IC., LT6015IS5 TSOT-S5 LINEAR TECH., LT6015IS5#TRPBF
Hardware
1 15 E1-E15 TESTPOINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 2 J1, J2 JACK BANANA KEYSTONE, 575-4
3 4 MH1-MH4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833

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dc2154af
DEMO MANUAL DC2154A
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
IO U TMON
- +
V+
V-
U2 LT6015IS5
OPT
3 4
1
52
C18
OPT 0.1uF
VIN
TP4
CLKOUT
TP3
IOUTMON BUFFERED
E4
GND
R13
OPT
C16
OPT 1210
E5
CTL
E1
SVIN
7V - 58V
R11
86.6k
E10
RUN
C15 OPT 1nF
C10
OPT
D1
OPT
SOD-123
D2
OPT
SOD-123
VOU T
VOU T
R8
OPT
2010 R5
OPT
51
5%
VIN
R3
100K
E3
SYNC
R2
5.23k
R10
332k
+
C14
47uF
63V
8mm DIA.
R7
0
C1
2.2uF
100V
1206
R14
OPT
L2
10uH
CDRH8D43NP-100NC
OPT
L1
10uH
CDRH8D43NP-100NC
OPT
C19
OPT
VIN
E11
GND
R9
OPT
C4
0.01uF
C5
0.22uF
16V
U1
LTM8056EY
V OUT
A1
V OUT
A2
V OUT
A3
V OUT
A4
V OUT
A5
V OUT
B1
V OUT
B2
V OUT
B3
V OUT
B4
V OUT
B5
VIN
G10
VIN
G11
VIN
H10
VIN
H11
VIN
J10
VIN
J11
VIN
K10
VIN
K11
VIN
L11
VIN
L10
IIN
L9
CLKOUT
G1
IOUT
D1
RT
H1
SY NC
H2
FB
J1
COMP
J2
CTL
K2
SS
K1
GND
L1
IOUTMON
L2
IINMON
L3
RUN
L4
GND
A9
GND
A7
GND
A8
GND
B7
GND
B8
GND
C7
GND
C8
GND
D2
GND
D3
GND
D4
GND
D5
GND
D6
GND
D7
GND
D8
GND
E1
GND
E2
GND
E3
GND
E4
GND
E5
GND
E6
GND
E7
GND
E8
LL
F1
GND
F2
GND
F3
GND
F4
GND
F5
GND
F6
GND
F7
GND
F8
GND
G3
GND
G4
GND
G5
GND
G6
GND
H3
GND
H4
GND
H5
GND
H6
GND
J3
GND
J4
GND
J5
GND
J6
GND
K3
GND
K4
GND
K5
GND
K6
GND
L5
SV IN
F11
SV IN
F10
V OUT
A6
V OUT
B6
V OUT
C1
V OUT
C2
V OUT
C3
V OUT
C4
V OUT
C5
V OUT
C6
GND
A10
GND
A11
GND
B9
GND
B10
GND
B11
GND
C9
GND
C10
GND
C11
GND
D9
GND
D10
GND
D11
GND
E9
GND
E10
GND
E11
GND
F9
GND
G7
GND
G8
GND
G9
GND
H7
GND
H8
GND
H9
GND
J7
GND
J8
GND
J9
GND
K7
GND
K8
GND
K9
GND
L6
GND
L7
GND
L8
MODE
G2
E6
MOD E
E8
IOUTMON
TP7
CTL
R1
43.2k
+
C9
15uF
50V
7343
R12
20 5%
R6
0
IO U TMON C3
2.2uF
100V
1206
C7
22uF
25V
0805
E9
IINMON
C12
4.7uF
100V
1210
OPT
C13
4.7uF
100V
1210 OPT
VIN
E2
CLKOUT
VIN
E14
VIN
7V - 58V
+
C6
15uF
50V
7343
E15
GND
TP2
GND
TP1
C8
22uF
25V
0805
R4
0.015
2010
C11
1uF, OPT 1206
C2
2.2uF
100V 1206
TP5
S YN C
J2 J1
TP6
GND
E12 VO U T
24V
E7
LL
C17
0.1uF 25V
E13
GND
R15
OPT
* SEE FIGURE 2 FOR IOUT MAX. VS. VIN
NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603, 1%. 2. ALL CAPACITORS ARE 0603.
525kHz
*

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dc2154af
DEMO MANUAL DC2154A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
LT 0115 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
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
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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