Linear Technology LT8705 Quick setup guide

dc1924afa

DEMO MANUAL DC1924A

DESCRIPTION

LT8705

80V VIN and VOUT Synchronous

4-Switch Buck-Boost DC/DC

Controller

Demonstration circuit 1924A is a high performance buck-

boost converter featuring the LT

8705 that can operate

from input voltages above, below or equal to the output

voltage. The demo board input range is 36V to 80V. The

output is optimized for 48V at 5A, with the output current

limit set at 7A. (The circuit will operate with lower input

voltage than 36V if load current is reduced).

The controller has integrated input current, input voltage,

output current and output voltage regulators. The one

regulator that wants to decrease current gets control over

thecompensationpinVC.Theinductorcurrentiscontrolled

by the VC signal that is fed into a current comparator

together with a ramp compensation signal.

While the current mode control limits the inductor current

both in normal and in reverse direction, these current

limits have some variation as input voltage changes. The

input and output current regulators offer more accurate

current limits.

The input voltage regulator is typically used in applica-

tions with solar panels or other high impedance power

sources, and will reduce the current if the input voltage

drops below the set point.

The operating mode of the controller is determined

through the MODE pin (jumper JP1) and can be set to

discontinuous mode, forced continuous mode and Burst

Mode

operation.

The LT8705 is capable of bidirectional operation when

operating in forced continuous mode. Additional circuitry

may be needed depending on the application.

L, LT, LTC, LTM, Linear Technology Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

The CLKOUT output and the SYNC input can be used

to synchronize two DC1924A circuits with 180 degree

phase shift.

By feeding the LT8705 from a separate low voltage sup-

ply, the power dissipation can be reduced. To supply the

LT8705 chip from an external voltage supply (> 6.4V), cut

thetraceasmarkedontheboardtodisconnecttheEXTVCC

pin from VOUT. The LT8705 will start when voltage is ap-

plied at the input (VIN pin), and when it is running it will

draw current from the EXTVCC pin if the voltage is > 6.4V.

Typical efficiency with 5A load is above 97% across a 36V

to 72V input range using the supplied inductor. Lower

core loss can be achieved by using a ferrite core inductor.

The LT8705 data sheet gives a complete description of

the part, operation and application information. The data

sheet should be read in conjunction with this quick start

guide for demo circuit 1924A. The input voltage range of

the LT8705 itself is 2.8V(need EXTVCC > 6.4V) to 80V

and the output range is 1.3V to 80V.

The LT8705EUHF is assembled in a 38-Lead (5mm ×

7mm) plastic QFN package with a thermal pad underneath

the chip. Proper board layout is essential for maximum

thermal and electrical performance. See the data sheet

section Circuit Board Layout Checklist.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1924A

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dc1924afa

DEMO MANUAL DC1924A

Figure 1a. Efficiency and Power Loss as Function of Input

Voltage at 5A Load. Dotted Lines Show Increased Efficiency

When the Inductor Is Replaced by a Ferrite Core Inductor

(Coiltronics SER2918H-223KL)

Figure 1b. Efficiency and Power Loss in CCM Buck Mode.

VIN = 56V. Dotted Lines Show Increased Efficiency When

the Inductor Is Replaced by a Ferrite Core Inductor

(Coiltronics SER2918H-223KL)

VIN (V)

30 36 42 48 54 60 66 72

EFFICIENCY (%)

100

DISSIPATION (W)

DC1924a F01a

EFFICIENCY

EFFICIENCY FERRITE

DISSIPATION

DISSIPATION FERRITE

EFFICIENCY

EFFICIENCY FERRITE

POWER LOSS

POWER LOSS FERRITE

LOAD CURRENT (A)

0.01

EFFICIENCY (%)

100

POWER LOSS (W)

0.1

DC1924a F01b

101

PERFORMANCE SUMMARY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range Note: Output Power Is Limited When VIN < 30V 36 48 80 V

VOUT Output Voltage 48 V

IIN Maximum Load Current 5 A

IOUT Output Current Limit 7 A

fSW Switching Frequency 200 kHz

EFF Efficiency at DC Input VIN = 36V, VOUT = 48V, IOUT = 5A

VIN = 48V, VOUT = 48V, IOUT = 5A

VIN = 72V, VOUT = 48V, IOUT = 5A

97.5

97.2

97.5

Specifications are at TA= 25°C

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dc1924afa

DEMO MANUAL DC1924A

1. Demonstration circuit 1924A is easy to set up to evalu-

ate the performance of the LT8705. Refer to Figure 2

for proper measurement equipment setup and follow

the procedure below.

2. With power off, connect the input power supply to VIN

(TP1) and GND (TP3).

3. Connect the SHDN terminal to ground with a clip-on

lead to disable the board.

4. Apply 48V to the input. The power source must have

greater than 12A capability if you want to evaluate the

board with full load over the input range.

5. Removetheclip-onleadfromSHDNtoenabletheboard.

6. Note that the demo circuit will be enabled at VIN > 5.6V,

when VIN is rising. If operation at very low input volt-

age is not wanted, increase the value of R11 to set the

undervoltage shutdown at the wanted level.

7. Oncetheproperoutputvoltageisestablished,adjustthe

load and the input voltage within the operating range

andobservetheoutputvoltageregulation,ripplevoltage

and efficiency and other parameters as needed. When

measuring input/output voltages, measure at the input/

output terminals of the board to avoid measurement

error caused by voltage drops in cables.

8. To measure input/output voltage ripple, avoid a long

ground lead on the oscilloscope probe, as it may pick

up switching noise. A commonly accepted method is to

removetheoscilloscopeprobeendcapandgroundlead

and set the 20MHz bandwidth limit on the oscilloscope.

Measurethe input/outputvoltageripple bytouchingthe

probe tip directly to the positive terminal of the input or

output capacitor. Connect the probe ground terminal to

the board’s GND plane near the capacitor with a very

short wire.

QUICK START PROCEDURE

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dc1924afa

DEMO MANUAL DC1924A

QUICK START PROCEDURE

Figure 2. Test Setup

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dc1924afa

DEMO MANUAL DC1924A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C13, C47 CAP CERM 0.22µF 10% 16V X5R 0603 TAIYO YUDEN EMK107BJ224KA-T

2 2 C14, C15 CAP CER 1000pF 16V 20% X7R 0603 AVX CORPORATION 0603YC102MAT4A

3 8 C41-C44, C48, C49-C51 CAP CER 4.7µF 100V X7S 1812 TDK C4532X7S2A475M

4 2 C46, C65 CAP CER 1.0µF 100V X7S 0805 TDK C2012X7S2A105K

5 4 C45, C52, C55, C64 CAP ALUM 220µF 100V 20% RADIAL UCC EKY-101ELL221MK25S

6 3 C56, C57, C58 CAP CER 4.7µF 16V 10% X5R 0603 TAIYO YUDEN, EMK107ABJ475KA-T

7 1 C59 CAP CER 1µF 16V 10% X7R 0603 TDK C1608X7R1C105K

8 1 C61 CAP CER 100nF 16V 10% X7R 0603 TDK C1608X7R1C104K

9 1 C62 CAP CER 220pF 25V 5% NP0 0603 NIC NMC0603NPO221J50TRPF

10 1 C63 CAP CER 3300pF 25V 5% NP0 0603 KEMET C0603C332J3GAC

11 2 D1, D2 RECTIFIERS ULTRA FAST RECTIFIER SINGLE CENTRAL SEMI CMMR1U-02 TR

12 4 D3, D4, D5, D6 LED SMARTLED GREEN 570NM 0603 LG L29K-G2J1-24-Z

13 1 L1 INDUCTOR POWER 22µH 11.0A SMD WÜRTH ELECTRONICS 74435572200

14 2 M1, M2 MOSFET N-CH 80V 55A TDSON-8 INFINEON BSC123N08NS3 G

15 2 M3, M4 MOSFET N-CH 60V 19A TDSON-8 INFINEON BSC039N06NS

16 2 R8, R9 RES 10.0Ω 1/10W 1% 0603 SMD VISHAY CRCW060310R0FKEA

17 1 R11 RES 71.5k 1/10W 1% 0603 SMD PANASONIC ERJ-3EKF7152V

18 1 R13 RES 392k 1/10W 0.1% 0603 SMD VISHAY MCT06030D3923BP100

19 1 R14 RES 20.0k 1/10W 1% 0603 SMD VISHAY CRCW060320K0FKEA

20 1 R16 RES 10.0k 1/10W 0.1% 0603 SMD PANASONIC ERA-3AEB103V

21 2 R27, R46 RES 100k 1/10W 1% 0603 SMD VISHAY CRCW0603100KFKEA

22 4 R38, R41, R51, R58 RES 2.00Ω 1/10W 1% 0603 SMD VISHAY CRCW06032R00FKEA

23 1 R40 RES 0.01Ω 3W 2512 5% SMD TT ELECTRONICS LRF3WLF-01-R010-J

24 4 R42, R43, R44, R45 RES 549Ω 1/10W 1% 0603 SMD VISHAY CRCW0603549RFKEA

25 1 R47 RES 210k 1/10W 1% 0603 SMD VISHAY CRCW0603210KFKEA

26 1 R49 RES 24.3k 1/10W 1% 0603 SMD VISHAY CRCW060324K3FKEA

27 1 R50 RES 56.2k 1/10W 1% 0603 SMD VISHAY CRCW060356K2FKEA

28 1 R57 RES 0.007Ω 1W 1% 2512 SMD VISHAY CRCW25127L000FEA

29 1 R62 RES 4.02Ω 1/10W 1% 0603 SMD VISHAY CRCW06034R02FKEA

30 1 U1 LT8705 SYNCHRONOUS 4 SWITCH BUCK-BOOST

DC/DC CONTROLLER LINEAR TECH LT8705EUHF#PBF

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dc1924afa

DEMO MANUAL DC1924A

Additional Demo Board Circuit Components

1 0 C12, C60 CAP 0603 OPTION CAP 0603 OPTION

2 0 C53, C54, C66-C71 CAP 1812 OPTION CAP 1812 OPTION

3 0 M1-1, M2-1, M3-1, M4-1 MOSFET POWER56 OPTION MOSFET POWER56 OPTION

4 0 R53, R54, R59, R60 RES 0603 OPTION RES 0603 OPTION

5 5 R22, R39, R48, R55 RES 0.0Ω 1/10W 0603 SMD VISHAY CRCW06030000Z0EA

6 2 R56 RES 0.0Ω 1.5W 2512 SMD VISHAY CRCW25120000Z0EG

Hardware: For Demo Board Only

1 1 JP1 CONN HEADER 4POS 2MM VERT T/H SAMTEC TMM-104-02-L-S

2 4 TP1, TP2, TP3, TP4 JACK NON-INSULATED 0.218" KEYSTONE 575-4

3 14 TP5, TP8-TP20 TERM SOLDER TURRET 0.094 MILL-MAX 25012-00-80-00-00-07-0

4 1 SHUNT1 CONN SHUNT 2MM 2POS SAMTEC 2SN-BK-G

5 4 MH1, MH2, MH3, MH4 SPACER STACKING #4 SCREW NYLON KEYSTONE ELECTRONICS 8833

6 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT #1924A

PARTS LIST

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dc1924afa

DEMO MANUAL DC1924A

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

VIN

36V to 80V

VOUT

48V / 5A

AGND

/SHDN

MODE

LDO33

SYNC

CLKOUT

SWEN

SRVO_FBOUT

SRVO_IOUT

SRVO_IIN

SRVO_FBIN

PGND PGND

AGND

SRVO_FBOUT

SRVO_IOUT

SRVO_IIN

SRVO_FBIN

EXTVCC

SEE NOTE 3

NOTES (UNLESS OTHERWISE SPECIFIED):

____________________________

1- ALL SMD CAPACITORS ARE 16V.

2- ALL SMD CAPACITORS AND RESISTORS ARE 0603.

3- CUT TRACE TO DISCONNECT EXTVCC FROM VOUT

AND SUPPLY EXTVCC THROUGH TP20.

DCM

FCM

BURST

TG2

FBIN

LDO33

TG2

TG1

LDO33

BG1

TG1

LDO33

BG2

EXTVCC

GATEVCC

VOUT

GATEVCC

VOUT

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, June 26, 2014

80V / 48V Synchronous Buck-Boost Controller

S. M.

MEHDI A.

N/A

LT8705EUHF

DEMO CIRCUIT 1924A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, June 26, 2014

80V / 48V Synchronous Buck-Boost Controller

S. M.

MEHDI A.

N/A

LT8705EUHF

DEMO CIRCUIT 1924A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, June 26, 2014

80V / 48V Synchronous Buck-Boost Controller

S. M.

MEHDI A.

N/A

LT8705EUHF

DEMO CIRCUIT 1924A

R13

392K

R13

392K

R55

C49

4.7µF

1812

100V

C49

4.7µF

1812

100V

M4-1

OPT.

M4-1

OPT.

1 7

R50

56.2K

R50

56.2K

C59

1µF

C59

1µF

R54

OPT.

R54

OPT.

C64

220µF

100V

C64

220µF

100V

CMMR1U-02

C65

1.0µF

100V

0805

C65

1.0µF

100V

0805

C71

OPT.

C71

OPT.

R46

100K

R46

100K C60

OPT.

C60

OPT.

C58

4.7µF

C58

4.7µF

C55

220µF

100V

C55

220µF

100V

C12

OPT.

C12

OPT.

TP17TP17

D3D3

R47

210K

R47

210K

M2-1

OPT.

M2-1

OPT.

1 7

R60

OPT.

R60

OPT.

R27

100K

R27

100K

TP8TP8

C53

OPT.

C53

OPT.

R43

549

R43

549

R38

TP11TP11

C15

1nF

C15

1nF

R56

2512

R56

2512

C56

4.7µF

C56

4.7µF

C69

OPT.

C69

OPT.

TP20TP20

C54

OPT.

C54

OPT.

R45

549

R45

549

TP4TP4

C14

1nF

C14

1nF

BSC123N08NS3 G

5 3

6 2

R51

R40

0.010

1225 Wide

R40

0.010

1225 Wide

R48

R59

OPT.

R59

OPT.

M1-1

OPT

M1-1

OPT

5 3

6 2

C48

4.7µF

100V

1812

C48

4.7µF

100V

1812

TP16TP16

TP13TP13

D4D4

TP3TP3

TP15TP15

TP12TP12

C46

1.0µF

100V

0805

C46

1.0µF

100V

0805

C50

4.7µF

100V

1812

C50

4.7µF

100V

1812

TP5TP5

TP10TP10

R22

C43

4.7µF

100V

1812

C43

4.7µF

100V

1812

C42

4.7µF

100V

1812

C42

4.7µF

100V

1812

R57

0.007

2512

R57

0.007

2512

TP14TP14

C41

4.7µF

100V

1812

C41

4.7µF

100V

1812

R41

C57

4.7µF

C57

4.7µF

TP18TP18

TP1TP1

R62

4.02

R62

4.02

R14

20K

R14

20K

R16

10K

R16

10K

22µH

C63

3300pF

25V

C63

3300pF

25V

C68

OPT.

C68

OPT.

D5D5

R58

C66

OPT.

C66

OPT.

R49

24.3K

R49

24.3K

TP2TP2

C45

220µF

100V

C45

220µF

100V M3

BSC039N06NS

1 7

BSC123N08NS3 G

1 7

C52

220µF

100V

C52

220µF

100V

R44

549

R44

549

M3-1

OPT

M3-1

OPT

1 7

R42

549

R42

549

TP9TP9

R39

LT8705EUHF

INTVCC

MODE

IMONIN

#SHDN

CSN 2

CSP 3

LDO33

FBIN

5FBOUT 6

IMONOUT

BG2 16

GATEVCC

BG1 14

BOOST2 17

TG2 18

SW2 19

SW1 21

TG1 22

BOOST1 23

EXTVCC

CSNOUT 30

CSPOUT 31

CSNIN

CSPIN

AGND

VIN

39 PGND

SYNC

CLKOUT 10

N/C 20

N/C 24

SRVO_FBOUT 28

SRVO_FBIN 25

SRVO_IIN 26

SRVO_IOUT 27

SWEN 36

C13

0.22µF

C13

0.22µF

C61

0.1uF

C61

0.1uF

BSC039N06NS

1 7

C67

OPT.

C67

OPT.

C44

4.7µF

100V

1812

C44

4.7µF

100V

1812

R53

OPT.

R53

OPT.

TP19TP19

D6D6

JP1JP1

C47

0.22µF

C47

0.22µF

R11

71.5K

R11

71.5K

C62

220pF

25V

C62

220pF

25V

C51

4.7µF

100V

1812

C51

4.7µF

100V

1812

C70

OPT.

C70

OPT.

CMMR1U-02

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dc1924afa

DEMO MANUAL DC1924A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0714 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

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

Thisdemonstrationboard(DEMO BOARD) kit being sold or provided by Linear TechnologyisintendedforuseforENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C 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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