Linear Technology DC2017A Quick setup guide

dc2017af

DEMO MANUAL DC2017A

Description

LTM8055

36VIN, 8.5A Buck-Boost

μModule

Regulator

Demonstration circuit 2017A features the LTM

8055, 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 DC2017A is 12V and the input voltage range

is 5V to 36V. The maximum output current is 6A and the

switching frequency is 600kHz.

DC2017Asupportstheadjustableandcontrollablefeatures

of the LTM8055 including output voltage and current

regulation,switching frequency,RUNthreshold, soft-start

period, synchronization and reverse inductor current in-

hibit. In most cases, adjustment is made by modifying the

appropriateresistor orcapacitorcomponent(s).DC2017A

provides output current monitoring and a clock output.

L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo 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 DC2017As in parallel.

The LTM8055 data sheet must be read in conjunction with

this demo manual to properly use or modify DC2017A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2017A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage, VIN 5 V

Maximum Input Voltage, VIN 36 V

Maximum Output Current, IOUT 12V < VIN < 36V, CTL = OPEN

VIN = 6V, CTL = OPEN 6

Input Turn-On Voltage, VIN R10 = 332k, R11 = 121k, VIN Rising 5.5 V

Input Turn-Off Voltage, VIN R10 = 332k, R11 = 121k, VIN Falling 4.5 V

Output Voltage, VOUT 100mA < IOUT < 6A, R2 = 11k, 1%

R3 = 100k 1%, R4 = 0.008Ω 11.72 12.45 V

Efficiency VIN = 24V, IOUT = 6A 94 %

Switching Frequency R1 = 36.5k 600 kHz

Output Current Limit R4 = 0.008Ω 6.4 A

dc2017af

DEMO MANUAL DC2017A

Quick start proceDure

To use DC2017A to evaluate the performance of the

LTM8055, refer to Figure 1 for the proper measurement

equipmentsetup,Figure2forthemaximumoutputcurrent

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 40V

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 LTM8055, an

aluminum electrolytic capacitor with higher ESR is placed

at the input terminals. This may protect against some, but

notall,inputtransientsduetoahot-pluggedpowersupply.

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

ripplebytouchingtheprobetipdirectlytoterminalsacross

the VIN or VOUT capacitors. See Figure 3 for proper scope

probe technique. Solder terminals near the input or output

capacitors, if necessary.

1. ConnecttheRUN terminal to groundwitha 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 6V and 36V

3. Remove the clip-on lead from RUN. Verify that VOUT is

12V.

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.

BoarD photo

dc2017af

DEMO MANUAL DC2017A

Figure 1. Proper Measurement Equipment Setup

Quick start proceDure

OPTIONAL WITH

R7 = OPEN

–

+–

–+

0V TO 36VDC

10A

3.3V

12VDC

0A TO 6A

OPTIONAL

dc2017af

DEMO MANUAL DC2017A

Figure 2. Maximum Output Current vs Input Voltage for VOUT = 12V

Figure 3. Proper Scope Probe Technique

Quick start proceDure

VIN (V)

OUTPUT CURRENT (A)

dc2017a F02

30 400 10 20

12VOUT R4 = SHORT

R4 = 0.008Ω

VOUT

GND

C17

dc2017af

DEMO MANUAL DC2017A

Figure 4. VOUT Noise Spectrum (VIN = 24V, VOUT = 12V at 6A)

Quick start proceDure

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

INTENSITY (dBm)

FREQUENCY (MHz)

dc2017af

DEMO MANUAL DC2017A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., CER., 4.7µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H475KA88L

2 1 C3 CAP., CER., 0.22µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C224K

3 1 C4 CAP., CER., 0.01µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C103KA01D

4 2 C5, C7 CAP., CER., 22µF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

5 1 C6 CAP., TANT., 68µF, 25V, 20%, 7343 AVX, TPSE686M025R0200

6 1 R1 RES., 36.5k, 1/10W, 1%, 0603 VISHAY, CRCW060336K5FKEA

7 1 R2 RES., 11k, 1/10W, 1%, 0603 VISHAY, CRCW060311K0FKEA

8 1 R3 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

9 1 R4 RES., SENSE, 0.008Ω, 1/2W, 1%, 2010 VISHAY, WSL20108L000FEA

10 1 U1 I.C., 36VIN Buck-Boost µModule Regulator LINEAR TECH., LTM8055EY#PBF

Optional Demo Circuit Components

1 0 C8, C10, C18(OPT) CAP., OPTION, 0603

2 1 C9 CAP., ALUM. ELECT.,100µF, 50V, 8 ×10.2 SUN ELECT., 50CE100LX

3 0 C11(OPT) CAP., OPTION, 1206

4 0 C12, C13, C15, C16(OPT) CAP., OPTION, 1210

5 0 C14(OPT) CAP., OPTION, 7343

6 1 C17 CAP., CER., 0.1µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

7 0 D1, D2(OPT) DIODE, OPTION, SOD-123

8 0 L1, L2(OPT) IND., 10µH WÜRTH, 74477010

9 0 R5, R9, R13(OPT) RES., OPTION, 0603

10 2 R6, R7 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW0603000Z0EA

11 0 R8(OPT) RES., OPTION, 2010

12 1 R10 RES., 332k, 1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA

13 1 R11 RES., 121k, 1/10W, 1%, 0603 VISHAY, CRCW0603121KFKEA

14 1 R12 RES., 20Ω, 1/10W, 5%, 0603 VISHAY, CRCW060320R0JNEA

15 0 U2(OPT) I.C., LT1636CMS8#PBF, 8-MSOP LINEAR TECH., LT1636CMS8#PBF

Hardware: For Demo Board Only

1 13 E1-E13 TESTPOINT, TURRET, .094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 J1, J2, J3, J4 JACK BANANA KEYSTONE, 575-4

3 4 MH1-MH4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833

dc2017af

DEMO MANUAL DC2017A

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

1. ALL RESISTORS ARE 0603, 1%.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

600kHz

*SEE FIGURE 2

FOR IOUT MAX. VS. VIN

VIN

VOUT

IOUTMON

VOUT

VIN

IOUTMON

100K

36.5k

C10

OPT

C10

OPT

E12 VOUT

12V

E12 VOUT

12V

TP5

SYNC

TP5

SYNC

10uH

74477010

OPT

10uH

74477010

OPT

SOD-123

OPT

SOD-123

OPT

IINMON

C12

4.7uF

50V

1210

OPT

C12

4.7uF

50V

1210

OPT

4.7uF

50V

1210

4.7uF

50V

1210

OPT

2010

OPT

2010

C14

OPT

7343

C14

OPT

7343

TP3

IOUTMON BFR

TP3

IOUTMON BFR

SVIN

5V - 36V E1

SVIN

5V - 36V

GND

R10

332k

R10

332k

TP1TP1

R13

OPT

R13

OPT

GND

0.008

2010

0.008

2010

4.7uF

50V

1210

4.7uF

50V

1210

TP7

CTL

TP7

CTL

C15

OPT

50V

1210

C15

OPT

50V

1210 C8

OPT

1nF

OPT

1nF

R11

121k

R11

121k

0.22uF

10uH

74477010

OPT

10uH

74477010

OPT

TP2

GND

TP2

GND

100uF

50V

8mm DIA.

100uF

50V

8mm DIA.

TP4

CLKOUT

TP4

CLKOUT

IOUTMON

J3J3

LTM8055EY

VOUT

VIN

G10

VIN

G11

VIN

H10

VIN

H11

VIN

J10

VIN

J11

VIN

K10

VIN

K11

VIN

L11

VIN

L10

IIN

CLKOUT

IOUT

SYNC

COMP

CTL

GND

IOUTMON

IINMON

RUN

GND

SVIN

F11

SVIN

F10

VOUT

GND

A10

GND

A11

GND

B10

GND

B11

GND

C10

GND

C11

GND

D10

GND

D11

GND

E10

GND

E11

GND

MODE

5V - 36V

VIN

5V - 36V

VIN

OPT

SOD-123

OPT

SOD-123

22uF

25V

0805

22uF

25V

0805

68uF

25V

7343

68uF

25V

7343

C18

OPT

0.1uF

C18

OPT

0.1uF

C16

OPT

1210

C16

OPT

1210

22uF

25V

0805

22uF

25V

0805

CTL

E10

RUN

E10

RUN

CLKOUT

MODE E6

MODE

E11

GND

E11

GND

11k

OPT

C13

4.7uF

50V

1210

OPT

C13

4.7uF

50V

1210

OPT

C11

OPT

1206

1uF

C11

OPT

1206

1uF

R12

TP6

GND

TP6

GND E13

GND

E13

GND

0.01uF

C17

0.1uF

25V

C17

0.1uF

25V

V+

V-

SHDN

LT1636CMS8

OPT

V+

V-

SHDN

LT1636CMS8

OPT

SYNC

SYNC J4J4

dc2017af

DEMO MANUAL DC2017A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 1214 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstration board (DEMO BOARD)kit being soldorprovided by LinearTechnology isintended for useforENGINEERING 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. LT C 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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