Linear Technology DC2154A Quick setup guide

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

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

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.

dc2154af

DEMO MANUAL DC2154A

Figure 1. Proper Measurement Equipment Setup

QUICK START PROCEDURE

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)

2154A F02

30 40 500

24VOUT

R4 = 0.015Ω

R4 = SHORT

VOUT

GND

C17

dc2154af

DEMO MANUAL DC2154A

Figure 4. VOUT Noise Spectrum (VIN = 48V, VOUT = 24V at 3A)

QUICK START PROCEDURE

FREQUENCY (MHz)

INTENSITY (dBm)

–20

–60

–100

–40

–80

–120 2.51.51 3.5

2154A F04

520.5 3 4.54

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

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-

LT6015IS5

OPT

C18

OPT

0.1uF

VIN

TP4

CLKOUT

TP3

IOUTMON BUFFERED

GND

R13

OPT

C16

OPT

1210

CTL

SVIN

7V - 58V

R11

86.6k

E10

RUN

C15

OPT

1nF

C10

OPT

SOD-123

OPT

SOD-123

VOU T

OPT

2010 R5

OPT

VIN

100K

SYNC

5.23k

R10

332k

C14

47uF

63V

8mm DIA.

2.2uF

100V

1206

R14

OPT

10uH

CDRH8D43NP-100NC

OPT

10uH

CDRH8D43NP-100NC

OPT

C19

OPT

VIN

E11

GND

OPT

0.01uF

0.22uF

16V

LTM8056EY

V OUT

VIN

G10

VIN

G11

VIN

H10

VIN

H11

VIN

J10

VIN

J11

VIN

K10

VIN

K11

VIN

L11

VIN

L10

IIN

CLKOUT

IOUT

SY NC

COMP

CTL

GND

IOUTMON

IINMON

RUN

GND

SV IN

F11

SV IN

F10

V OUT

GND

A10

GND

A11

GND

B10

GND

B11

GND

C10

GND

C11

GND

D10

GND

D11

GND

E10

GND

E11

GND

MODE

MOD E

IOUTMON

TP7

CTL

43.2k

15uF

50V

7343

R12

IO U TMON

2.2uF

100V

1206

22uF

25V

0805

IINMON

C12

4.7uF

100V

1210

OPT

C13

4.7uF

100V

1210

OPT

VIN

CLKOUT

VIN

E14

VIN

7V - 58V

15uF

50V

7343

E15

GND

TP2

GND

TP1

22uF

25V

0805

0.015

2010

C11

1uF, OPT

1206

2.2uF

100V

1206

TP5

S YN C

TP6

GND

E12 VO U T

24V

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

dc2154af

DEMO MANUAL DC2154A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●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

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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