Analog Devices 2787A User manual

DEMO MANUAL DC2787A

Rev. 0

DESCRIPTION

LTC7821

High Efficiency, Polyphase Hybrid

Step Down Converter

Demonstration circuit 2787A is a high efficiency, 4 phase,

hybrid converter. It can deliver 12V/100A with the input

voltage from 40V to 60V. The demo board features the

LT C

7821, which uses an architecture that merges a soft-

switching switched-capacitor topology with a traditional

step-down converter to provide superior efficiency com-

pared to the traditional switching architectures. It offers

a high efficiency/high density and cost effective solution

for nonisolated intermediate bus applications in power

distribution, datacom and telecom as well as emerging

48V automotive systems.

External MOSFETs switch at a 400kHz fixed frequency for

this demo board and can be programmed from 200kHz to

1.5MHz. The LTC7821’s powerful 1Ω N-channel MOSFET

gate drivers maximize efficiency and can drive multiple

MOSFETs in parallel for higher power applications. Due to

its current mode control architecture, multiple LTC7821

devices can be operated in a parallel, multiphase con-

figuration with excellent current sharing and low output All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

voltage ripple to enable much higher power applications.

Other benefits include low EMI emissions due to a soft-

switched front end and reduced MOSFET stress.

The LTC7821 design eliminates the inrush current typically

associated with switched capacitor circuits by prebalancing

the capacitors on start-up. The LTC7821 also monitors sys-

tem voltage, current and temperature for faults, and uses a

sense resistor for overcurrent protection. It stops switch-

ing and pulls the FAULT pin low when a fault condition

occurs. An onboard timer can be set for appropriate restart/

retry times. Additional features include ±1% output voltage

accuracy over temperature, a clock output for multiphase

operation, a power good output signal, short-circuit protec-

tion, monotonic output voltage start-up, optional external

reference, undervoltage lockout and internal charge bal-

ance circuitry. The LTC7821 data sheet must be used in

conjunction with this demo board manual.

Design files for this circuit board are available.

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 40 60 V

Output Voltage, VOUT VIN = 40-60V, IOUT = 0A to 100A 12 V

Maximum Output Current, IOUT VIN = 40-60V, VOUT = 12V 100 A

Typical Efficiency VIN = 48V, VOUT = 12V, IOUT = 100A 97.6 %

Peak Efficiency VIN = 48V, VOUT = 12V 98 %

Switching Frequency 400 kHz

DEMO MANUAL DC2787A

Rev. 0

BOARD PHOTO

Figure1. 4x LTC7821; 100A DC2787A Demo Circuit

DEMO MANUAL DC2787A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2787A is easy to set up to evaluate

the performance of the LTC7821. Refer to Figure2 for

the proper measurement equipment setup and follow the

procedure below.

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

(40V-60V) and GND (input return).

2. Connect the output loads between VOUT and GND

(Initial load: no load). Refer to Figure2.

3. Connect the DVMs to the input and output.

4. Check the default jumper/switch position:SW1 (RUN):

OFF; JP2 (BIAS): ON.

5. Turn on the input power supply and adjust voltage to 48V;

NOTE. Make sure that the input voltage does not exceed 60V.

6. Turn on the switches: SW1: ON.

7. Check for the proper output voltages from VO_SNS+

to VO_SNS−.

8. Once the proper output voltage is established, adjust

the loads within the operating range and measure the

efficiency, output ripple voltage and other parameters.

9. After completing all tests, adjust the load to 0A, power

off the input power supply.

Notes:

1. When measuring the output or input voltage ripple, do

not use the long ground lead on the oscilloscope probe.

See Figure3 for the proper scope probe technique. Short,

stiff leads need to be soldered to the (+) and (−) terminals

of an output capacitor. The probe’s ground ring needs to

touch the (−) lead and the probe tip needs to touch the

(+) lead.

2. When doing the load step test with the on-board

dynamic load circuit, please make sure the load step-up

pulse duty cycle does not exceed 2% and the pulse dura-

tion is less than 500µs so that the temperature of the

MOSFETs Q20, Q21 in the dynamic load circuit stay in the

safe region. Instead of using the on-board dynamic load

circuit, an electric load can also be used for the load step

test, which does not have the 2% max duty cycle limit for

the load step.

DEMO MANUAL DC2787A

Rev. 0

QUICK START PROCEDURE

Load (0~100A)

1mΩ

VIN

40V-60V

Figure2. Proper Measurement Equipment Setup

Figure3. Measuring Output Voltage Ripple

DEMO MANUAL DC2787A

Rev. 0

QUICK START PROCEDURE

Figure4. Efficiency vs Load Current at VOUT = 12V, fSW = 400kHz

Figure5. Current Sharing vs Load Current at VIN = 48V, VOUT = 12V, fSW = 400kHz

DC2787A F04

100

0 20 40 60 80 100

EFFICIENCY (%)

40VIN

48VIN

60VIN

OUTPUT LOAD CURRENT (A)

DC2787A F05

0 20 40 60 80 100

LOAD CURRENT PER PHASE (A)

TOTAL LOAD CURRENT (A)

PHASE #1

PHASE #2

PHASE #3

PHASE #4

Efficiency vs Load Current

Current Sharing vs Load Current

DEMO MANUAL DC2787A

Rev. 0

QUICK START PROCEDURE

50μ/DIV

VOUT(20MHz BW)

100mV/DIV

50A-75A-50A LOAD

20A/DIV

2787A F06

Figure6. Load Step at VIN = 48V, VOUT = 12V

Figure7. Thermal performance VIN = 48V, VOUT = 12V, IOUT = 100A TA = 23˚C, No Airflow

Figure8. Thermal performance VIN = 48V, VOUT = 12V, IOUT = 100A A = 23˚C, 200LFM Airflow

DEMO MANUAL DC2787A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 8 C1, C6, C68-C70, C74,

C153, C154

CAP.,33uF,ALUM. ELECT.,80V,20%,10x10.2mm SMD,

RADIAL,AEC-Q200

PANASONIC, EEHZA1K330P

2 26 C2, C3, C7, C47, C49,

C56, C58, C59, C71-C73,

C85-C88, C103-C105,

C109, C119, C203,

C206-C210

CAP.,2.2uF,X7R,100V,10%,1210 AVX, 12101C225KAT2A

3 16 C4, C5, C12, C13, C15,

C17, C37, C91, C95,

C107, C166, C169, C174,

C175, C287, C288

CAP.,0.1uF,X7S,100V,10%,0603 TAIYO YUDEN, HMK107C7104KA-T

4 8 C8, C14, C40, C106,

C108, C165, C167, C170

CAP.,0.22uF,X7R,25V,10%,0603 YAGEO, CC0603KRX7R8BB224

5 4 C9, C102, C164, C173 CAP.,0.47uF,X7R,25V,10%,0603 AVX, 06033C474KAT2A

6 113 C10, C11, C18-C25,

C28-C36, C38, C41, C43,

C60-C67, C75-C83, C90,

C92-C94, C98-C101,

C111-C118, C121-C150,

C176-C202, C216

CAP.,10uF,X7S,100V,10%,1210 MURATA, GRM32EC72A106KE05L

7 4 C26, C120, C157, C158 CAP.,2.2uF,X5R,25V,10%,0603 MURATA, GRM188R61E225KA12D

8 5 C27, C50, C96, C159,

C162

CAP.,1uF,X7R,25V,10%,0603,AEC-Q200 MURATA, GCM188R71E105KA64D

9 1 C39 CAP.,4.7nF,X7R,25V,10%,0603 AVX, 06033C472KAT2A

10 8 C42, C44, C57, C84, C89,

C97, C152, C155

CAP.,150uF,ALUM./OS-CON,16V,20%,8x6.9mm

SMD, RADIAL

PANASONIC, 16SVPC150M

11 4 C45, C110, C156, C215 CAP.,27pF,C0G,250V,5%,0603 MURATA, GQM1875C2E270JB12D

12 2 C52, C53 CAP.,22uF,X5R,25V,10%,1210 MURATA, GRM32ER61E226KE15K

13 1 C54 CAP.,0.047uF,X7R,25V,10%,0603 AVX, 06033C473KAT2A

14 1 C55 CAP.,220pF,C0G,50V,5%,0603 AVX, 06035A221JAT2A

15 4 C255, C257, C259, C261 CAP.,4.7uF,X5R,16V,10%,0603 MURATA, GRM188R61C475KE11D

16 4 C256, C258, C260, C262 CAP.,4.7uF,X5R,50V,10%,0805 MURATA, GRM21BR61H475KE51L

17 12 D1-D6, D11-D16 DIODE,SCHOTTKY,40V,250mW,SOD-323 CENTRAL SEMI., CMDSH-4E TR Lead Free

18 4 L1-L4 IND.,2uH,PWR. SHIELDED,20%,40A,1.34mOhms,19

.69x19.55x10.67mm, SMD,AEC-Q200

COILCRAFT, SER2011-202MLB

19 1 L5 IND.,68uH,PWR, SHIELDED,20%,0.74A,0.42

OHM,2424, LPS6225

COILCRAFT, LPS6225-683MRB

20 4 Q1, Q2, Q11, Q13 XSTR.,MOSFET, N-CH,80V,40A,TSDSON-8 FL INFINEON, BSZ070N08LS5

21 8 Q3-Q6, Q9, Q10, Q15,

Q16

XSTR.,MOSFET, N-CH,40V,98A,TDSON-8 INFINEON, BSC032N04LS

22 4 Q7, Q8, Q12, Q14 XSTR.,MOSFET, N-CH,40V,100A,TDSON-8 FL INFINEON, BSC014N04LSI

23 2 Q20, Q21 XSTR.,MOSFET, N-CH,40V,TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3

24 8 R1, R7, R19, R38, R42,

R58, R59, R61

RES.,1k OHM,1%,1/10W,0603 VISHAY, CRCW06031K00FKEA

DEMO MANUAL DC2787A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

25 4 R2, R36, R53, R56 RES.,AEC-Q200,1 OHM,5%,1/10W,0603 VISHAY, CRCW06031R00JNEA

26 43 R5, R10-R12, R14,

R20, R24, R32, R33,

R35, R40, R41, R45,

R47, R50, R51, R76,

R226-R231, R240, R241,

R246, R252, R254-R256,

R258, R264, R266-R268,

R270, R271, R273-R276,

R278, R279

RES.,0 OHM,1/10W,0603 VISHAY, CRCW06030000Z0EA

27 1 R6 RES.,AEC-Q200,1M OHM,1%,1/8W,0805 PANASONIC, ERJ6ENF1004V

28 1 R8 RES.,34k OHMS,1%,1/10W,0603 NIC, NRC06F3402T

29 9 R9, R13, R22, R28, R49,

R60, R62, R272, R277

RES.,AEC-Q200,10k OHMS,1%,1/10W,0603 VISHAY, CRCW060310K0FKEA

30 4 R15, R37, R52, R57 RES.,100k OHMS,1%,1/10W,0603 VISHAY, CRCW0603100KFKEA

31 4 R16, R48, R64, R68 RES.,53.6k OHMS,1%,1/10W,0603,AEC-Q200 VISHAY, CRCW060353K6FKEA

32 4 R17, R43, R70, R71 RES.,AEC-Q200,6.81k OHMS,1%,1/8W,0805 VISHAY, CRCW08056K81FKEA

33 1 R18 RES.,3.74k OHMS,1%,1/10W,0603 PANASONIC, ERJ3EKF3741V

34 4 R23, R75, R244, R259 RES.,AEC-Q200,60.4k OHMS,1%,1/10W,0603 VISHAY, CRCW060360K4FKEA

35 4 R25, R66, R245, R248 RES.,AEC-Q200,4.32k OHMS,1%,1/10W,0603 VISHAY, CRCW06034K32FKEA

36 1 R26 RES.,182k OHMS,1%,1/10W,0603,AEC-Q200 PANASONIC, ERJ3EKF1823V

37 1 R27 RES.,20k OHMS,5%,1/10W,0603,AEC-Q200 NIC, NRC06J203TRF

38 1 R29 RES.,80.6k OHMS,1%,1/10W,0603 VISHAY, CRCW060380K6FKEA

39 2 R30, R247 RES.,0.2 OHM,1%,1/2W,2010,SENSE, AEC-Q200 VISHAY, WSL2010R2000FEA

40 1 SW1 SWITCH,SLIDE,DPDT,0.3A,6VDC,PTH C&K, JS202011CQN

41 4 U1-U4 IC, Hybrid Step-Down Synchronous Controller QFN-32 ANALOG DEVICES, LTC7821EUH#PBF

42 1 U7 IC, SYNCHRONOUS STEP-DOWN CONVERTER ANALOG DEVICES, LTC3630AEMSE#PBF

Additional Demo Board Circuit Components

1 0 C16, C46, C48, C51,

C160, C171, C172,

C290-C295

CAP., OPTION, 0603

2 0 Q1A, Q1A1, Q11A,

Q11A1, Q22, Q22A,

Q22A1-Q22A3, Q25, Q26,

Q29, Q30, Q33, Q34, Q37

XSTR., OPTION, MOSFET N-CH, PPAK SO-8

3 0 Q23, Q24, Q27, Q28,

Q31, Q32, Q35, Q36

XSTR., OPTION, MOSFET N-CH, PG-TDSON-8

4 0 R3, R31, R34, R44, R46,

R65, R74, R234, R235,

R250, R251, R253,

R262, R263, R265

RES., OPTION, 0603

5 0 RN1-RN4 THERMISTOR, OPTION, 0603

PARTS LIST

DEMO MANUAL DC2787A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware

1 14 E1-E6, E8-E15 TEST POINT,TURRET,0.094",MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 J1-J4 STUD, FASTENER, #10-32 PENNENGINEERING, KFH-032-10ET

3 2 J5, J6 CONN.,RF, BNC,RCPT JACK,5-PIN,STR, THT,50 Ohms AMPHENOL RF, 112404

4 4 J1-J4 RING, LUG, CRIMP,#10,NON-

INSULATED,SOLDERLESS TERMINALS

KEYSTONE, 8205

5 8 J1-J4 NUT,HEX,#10-32,BRASS PENCOM, NU1132

6 1 JP2 CONN.,HDR,MALE,1x3,2mm,STR, THT,NO SUBS.

ALLOWED

Wurth Elektronik, 62000311121

7 4 J1-J4 WASHER,#10,LOCK,EXT,TIN FINISH PENCOM, WA4526

8 6 MH1-MH6 STANDOFF,NYLON,SNAP-ON,0.625" KEYSTONE, 8834

9 1 XJP2 CONN.,SHUNT,FEMALE,2 POS,2mm Wurth Elektronik, 60800213421

DEMO MANUAL DC2787A

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

12V / 100A

NOTES: UNLESS OTHERWISE SPECIFIED,

1. CAPACITORS AND RESISTORS ARE 0603.

SER2011-202MLD

RUN

OFF

40V~60V

APPROVEDECO

3 PROD 02/20/19

DATEREV

REVISION HISTORY

` `

DESCRIPTION

INTVCC1

VOUT

EXTVCC

VOUT

INTVCC1

VOUT

VIN

INTVCC1

VIN

INTVCC1

VIN

VOUTA

RUN

TRACK/SS

ITH

VFB

CLKOUT1

FAULT

PGOOD

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCBDES.

APPENG. Phone:1‐408‐432‐1900

Milpitas,CA95035

1630McCarthyBlvd.

ForADICustomerUseOnly

CUSTOMER NOTICE

ANALOGDEVICESINC.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ANALOGDEVICES

INC.APPLICATIONSENGINEERINGFORASSISTANCE.

THISCIRCUITISPROPRIETARYTOANALOGDEVICESINC.AND

SUPPLIEDFORUSEWITHANALOGDEVICESINC.PARTS.

SCALE=NONE

SIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCABOM:

PCAASS'Y:

www.analog.com

` \

` `

LTC7821

DC2787A

700-DC2787A_REV03

705-DC2787A_REV03

N/A

Thursday, May 16, 2019

710-DC2787A_REV03

HIGH EFFICIENCY, POLYPHASE HYBRID STEP-DOWN

CONVERTER

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCBDES.

APPENG. Phone:1‐408‐432‐1900

Milpitas,CA95035

1630McCarthyBlvd.

ForADICustomerUseOnly

CUSTOMER NOTICE

ANALOGDEVICESINC.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ANALOGDEVICES

INC.APPLICATIONSENGINEERINGFORASSISTANCE.

THISCIRCUITISPROPRIETARYTOANALOGDEVICESINC.AND

SUPPLIEDFORUSEWITHANALOGDEVICESINC.PARTS.

SCALE=NONE

SIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCABOM:

PCAASS'Y:

www.analog.com

` \

` `

LTC7821

DC2787A

700-DC2787A_REV03

705-DC2787A_REV03

N/A

Thursday, May 16, 2019

710-DC2787A_REV03

HIGH EFFICIENCY, POLYPHASE HYBRID STEP-DOWN

CONVERTER

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCBDES.

APPENG. Phone:1‐408‐432‐1900

Milpitas,CA95035

1630McCarthyBlvd.

ForADICustomerUseOnly

CUSTOMER NOTICE

ANALOGDEVICESINC.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ANALOGDEVICES

INC.APPLICATIONSENGINEERINGFORASSISTANCE.

THISCIRCUITISPROPRIETARYTOANALOGDEVICESINC.AND

SUPPLIEDFORUSEWITHANALOGDEVICESINC.PARTS.

SCALE=NONE

SIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCABOM:

PCAASS'Y:

www.analog.com

` \

` `

LTC7821

DC2787A

700-DC2787A_REV03

705-DC2787A_REV03

N/A

Thursday, May 16, 2019

710-DC2787A_REV03

HIGH EFFICIENCY, POLYPHASE HYBRID STEP-DOWN

CONVERTER

C15

0.1uF

C59

2.2uF

100V

1210

Q1A

OPT

LTC7821EUH

MODE/PLLIN

CLKOUT

RUN

FAULTB

PGOOD

TIMER

TRACK/SS

EXT_REF

ISENSE+

EXTVCC

ISENSE-

PGND

BG2

INTVCC

SW3

TG2

BG1

HYS_PRGM

ITH

FREQ

TEMP

VFB

BOOST3

BOOST2

MID

MIDSENSE

VINSENSE

VIN

SW1

TG1

BOOST1

SGND

VOUT

C23

C89

150uF

16V

C36

10uF

2.2uF

100V

1210

CMDSH-4E

C74

0805

C67

1210

R240

R10 0

BSZ070N08LS5

C31

10uF

1210

C63 C19

C153

R12

C68

R246

R15

100k

C73

Q24

OPT

VIN

C45

27pF

C154

R5 0

E10

PLLIN

C24

1210

C26 2.2uF

R250

OPT

L1 2uH

EXTVCC

R31

OPT

33uF

80V

VO_SNS-

BSC014N04LSI

10k

C37 0.1uF

R25

4.32k

2.2uF

100V

1210

R20

VIN

C48

OPT

C34

10uF

C105

2.2uF

1210

0.22uF

SW1

C41

10uF

100V

1210

C72 R3

OPT

R7 1k

RN1

OPT

t°

C84

150uF

16V

C60

10uF

100V

C32

10uF

C20

CMDSH-4E

2 1

GND

R270

R226 0

C103

100V

R16

53.6k

GND

C255

4.7uF

C64

10uF

100V

C46

OPT

C97

150uF

16V

E13

FAULT

E14

RUN

C56

100V

C207

BSC032N04LS

C16

OPT

R33

C61

C39

4.7nF

C70

C25

C35

10uF

C256 4.7uF

0805

C208

R32

VO_SNS+

0.1uF

C71

2.2uF

1210

Q22

OPT

CMDSH-4E

2 1

Q23

OPT

33uF

80V

E11

PGOOD

R17

6.81k

0805

R23

60.4k

C65

C44

150uF

16V

GND

34k

C152

150uF

16V

R271

Q22A

OPT

C29

10uF

100V

R227

GND

C43

10uF

100V

1210

C18

10uF

100V

1210

C58

2.2uF

100V

1210

R13

10k

C62

1210

C27 1uF

C22

10uF

100V

C155

150uF

16V

BSC032N04LS

C33

10uF

100V

1210

Q25

OPT

C40

0.22uF

C10

10uF

100V

1210

C42

150uF

16V

0.47uF

C66

R18

3.74k

C69

C81

10uF

100V

1210

C57

150uF

16V

C30

10uF

0.1uF

C21

FAULT

Table of contents

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