Linear Technology DC2142A Quick setup guide

dc2142af

DEMO MANUAL DC2142A

Description

LTC3875EUJ & LTC3874IUFD

High Efficiency, Single-Output Synchronous

Buck Converter with Very Low DCR Inductor

Demonstration circuit 2142A is a high efficiency, high

density, 4-phase synchronous buck converter with a 4.5V

to 14V input range. It can supply 120A maximum load

current at a 1.0V output. This demo board incorporates

the LTC3875EUJ and LTC3874IUFD controllers.

The LTC

3875 is a feature-rich dual phase synchronous

buck controller with very low DCR current sensing capa-

bility, on-chip drivers and remote output voltage sens-

ing. The LTC3874 is a compact dual phase synchronous

buck phase extender with very low DCR current sensing

capability, on-chip drivers and immediate response to

master IC's fault.

This board is setup with 0.32mΩ DCR inductor. The tem-

perature compensation function guarantees accurate cur-

rent limit over awide temperature range with DCR sensing.

TheDC2142canprovidehighefficiency,highpowerdensity

and compact solutions for telecom and datacom systems, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

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

performance summary

industrial and medical instruments, DC power distribution

systems and computer systems. The LTC3875 is available

in a 40-pin 6mm ×6mm QFN package. The LTC3874 is

available in a 28-lead (4mm ×5mm) QFN Package.

To shut down the converter, set the RUN pin voltage be-

low 1.4V(SW1: OFF). Use the JP1 jumper to select burst

mode, pulse skipping mode or forced continuous mode

operation at light load. Switching frequency is preset at

about 400kHz, and it can be easily modified from 250kHz

to 770kHz. An on-board dynamic circuit is also available

for transient test. The LTC3875 and LTC3874 data sheets

give a complete description of these parts, and must be

read in conjunction with this DC2142A quick start guide

Design files for this circuit board are available at

http://www.linear.com/demo/DC2142A

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 4.5V to 14V

Output Voltage, VOUT VIN = 4.5V to 14V, IOUT1 = 0A to 120A 1.0V ±2%

Maximum Output Current, IOUT VIN = 4.5V to 14V, VOUT1 = 1.0V 120A

Typical Efficiency, VOUT VIN = 12V, VOUT1 = 1.0 V, IOUT1 = 120A 87.4%

Typical Switching Frequency 400kHz

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dc2142af

DEMO MANUAL DC2142A

Quick start proceDure

Demonstration circuit 2142A is easy to set up to evaluate

the performance of the LTC3875EUJ and LTC3874IUFD.

Refer to Figure 1 for the proper measurement equipment

setup and follow the procedure below:

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

(4.5V to 14V) and GND (input return).

2. Connect the 1.0V output load between VOUT and GND

(Initial load: no-load).

3. Connect the DVMs to the input and outputs. Set default

jumper position: JP1: CCM; SW1: ON.

4. Turnonthe input powersupplyand check fortheproper

output voltages. VOUT should be 1.0V ±2%.

5. Once the proper output voltages are established, ad-

just the loads within the operating range and observe

the output voltage regulation, ripple voltage and other

parameters.

Note: When measuring the output or input voltage ripple,

donot usethe long ground lead on the oscilloscopeprobe.

See Figure 2 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.

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dc2142af

DEMO MANUAL DC2142A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

+ –

VOUT GND

C40

–

+–

VOUT

VIN

4.5V TO 14V

1mΩ

dc2142a F01

–

LOAD

(0A ~ 120A)

–

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dc2142af

DEMO MANUAL DC2142A

Quick start proceDure

20 40 60

LOAD CURRENT (A)

EFFICIENCY (%)

80 100

dc2142a F03

120

Figure 3. Efficiency vs Load Current at VIN = 12V, VOUT = 1.0V, fSW = 400kHz

Figure 4. Thermal Performance at VIN = 12V, VOUT = 1.0V, IOUT = 120A, 200PFM Forced Air Flow

Efficiency vs Load Current, VOUT = 1.0V

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dc2142af

DEMO MANUAL DC2142A

Quick start proceDure

Figure 5. Current Sharing vs Load Current at VIN = 12V, VOUT = 1.0V, fSW = 400kHz

Figure 6. Output Voltage Ripple at VIN = 12V, VOUT = 1.0V, IOUT = 120A

Current Sharing vs Load Current, VOUT = 1.0V

20 40 60

LOAD CURRENT (A)

CURRENT SHARING (A)

80 100

dc2142a F05

120

CHANNEL 4

CHANNEL 3

CHANNEL 2

CHANNEL 1

±3.6%

VOUT (20MHz BW) [5mV/DIV]

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dc2142af

DEMO MANUAL DC2142A

Quick start proceDure

Figure 7. Transient Performance at VIN = 12V, VOUT = 1.0V, IOUT = 30A ~ 60A

VOUT(20MHzBW)[20mV/DIV]

30A TO 60A LOAD STEP

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 8 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6,

CIN7, CIN8 CAP, 1210, 10µF, 20%, 35V X5R AVX 1210DD106MAT2A

2 14 COUT1, COUT2, COUT6, COUT7,

COUT9, COUT12, COUT13, COUT14,

COUT19, COUT20, COUT24, COUT25,

C39, C40

CAP, 1210, 100µF, 20%, 6.3V X5R TDK C3225X5R0J107M

3 12 COUT3, COUT4, COUT5, COUT8,

COUT10, COUT11, COUT15, COUT16,

COUT17,COUT18, COUT22, COUT23

CAP, 7343, 330µF, 20%, 6.3V POSCAP SANYO 6TPF330M9L

4 3 C3, C25, C29 CAP, 0603, 1µF, 20%, 25V X5R AVX 06033D105KAT2A

5 2 C1, C2 CAP, 270µF, 20%, 16V OSCON PANASONIC 16SVPC270M

6 4 C4, C30, C31, C46 CAP, 0603, 4.7µF, 10%, 10V X5R AVX 0603ZD475KAT2A

7 1 C5 CAP, 0603, 10nF, 10%, 16V X7R AVX 0603YC103KAT2A

8 5 C7, C8, C18, C32, C36, CAP, 0603, 0.1µF, 10%, 25V X5R AVX 06033C104KAT2A

9 6 C10, C12, C20, C24, C33, C35 CAP, 0603, 220nF, 10%, 25V X7R TDK C1608X7R1E224K

10 1 C15 CAP, 0603, 220pF, 5%, 50V C0G AVX 06035A221JAT2A

11 1 C16 CAP, 0603, 2.2nF, 5%, 50V C0G MURATA GRM1885C1H222JA01D

12 1 C34 CAP, 0603, 100pF, 10%, 16V X7R AVX 0603YC101KAT2A

13 1 D1, D2, D3, D4 DIODE, SCHOTTKY 30V, 100mA CENTRAL SEMI CMDSH-3-TR

14 4 L1, L2, L3, L4 IND, 0.25µH WÜRTH ELEKTRONIK 744301025

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dc2142af

DEMO MANUAL DC2142A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

15 4 Q1, Q5, Q10, Q15 XSTR, POWER MOSFET INFINEON BSC050NE2LS

16 4 Q3, Q7, Q13, Q17 XSTR, POWER MOSFET INFINEON BSC010NE2LSI

17 1 Q19 XSTR, N-CHANNEL DMOS FET FAIRCHILD 2N7002A

18 2 Q20, Q21 XSTR, MOSFET, N-CHANNEL 30V VISHAY SUD50N04-8M8P-4GE3

19 1 R1 RES, 0603, 20kΩ, 5%, 1/10W VISHAY CRCW060320K0JNEA

20 1 R2 RES, 0603, 3.01kΩ, 1%, 1/10W VISHAY CRCW06033K01FKEA

21 1 R3 RES, 0603, 1kΩ, 5%, 1/10W VISHAY CRCW06031K00JNEA

22 3 R4, R51, R85 RES, 0603, 2.2Ω, 5%, 1/10W VISHAY CRCW06032R20JNEA

23 2 R6, R14 RES, 0603, 10Ω, 1%, 1/10W VISHAY CRCW060310R0FKEA

24 4 R8, R28, R58, R66 RES, 0603, 715Ω, 1%, 1/10W VISHAY CRCW0603715RFKEA

25 2 R9, R27 RES, 0603, 3.57kΩ, 1%, 1/10W VISHAY CRCW06033K57FKEA

26 13 R10, R13, R24, R50, R53, R54, R56,

R57, R59, R60, R61, R65, R67 RES, 0603, 0Ω, JUMPER VISHAY CRCW06030000Z0EA

27 1 R12 RES, 0603, 13.3kΩ, 1%, 1/10W VISHAY CRCW060313K3FKEA

28 1 R17 RES, 0603, 20kΩ, 1%, 1/10W VISHAY CRCW060320K0FKEA

29 1 R21 RES, 0603, 4.02kΩ, 1%, 1/10W VISHAY CRCW06034K02FKEA

30 3 R33, R42, R69 RES, 0603, 100kΩ, 1%, 1/10W VISHAY CRCW0603100KFKEA

31 1 R45 RES, 0603, 5kΩ, 5%, 1/10W VISHAY CRCW06035K00JNED

32 2 R46, R47 RES, 0603, 10kΩ, 1%, 1/10W VISHAY CRCW060310K0FKEA

33 1 R63 RES, 0603, 75kΩ 5% 1/10W VISHAY CRCW060375K0JNEA

34 1 R102 RES, 0603, 237kΩ, 1%, 1/10W VISHAY CRCW0603237KFKEA

35 1 SW1 SWITCH, SUBMINATURE SLIDE C&K JS202011CQN

36 1 U1 IC, DUAL, 2-PHASE, SYNCHRONOUS

REGULATORS LINEAR TECH. LTC3875EUJ#PBF-ES

37 1 U2 IC, POLYPHASE STEP-DOWN

SYNCHRONOUS SLAVE CONTROLLER LINEAR TECH. LTC3874IUFD#PBF

Additional Demo Board Circuit Components

1 0 COUT27, COUT28, COUT29, COUT30,

COUT31, COUT32, COUT33, COUT34,

COUT35, COUT36, COUT37, COUT38,

COUT39, COUT40, COUT41, COUT42,

COUT43, COUT44, COUT45, COUT46

CAP, 1210 OPTION OPTION

2 0 C9, C11, C26, C27, C28 CAP, 0603 OPTION OPTION

3 4 C43, C44, C47, COUT21, CAP, 0603, 1µF, 20%, 25V X5R AVX 06033D105KAT2A

4 1 C37 CAP, 0805, 10µF, 10%, 16V X5R MURATA GRM21BR61C106KE15L

5 1 C38 CAP, 0805, 22µF, 10%, 10V X5R TDK C2012X5R1A226K

6 1 C42 CAP, 0603, 150pF, 5%, 50V NPO AVX 06035A151JAT2A

7 2 C41, C45 CAP, 0603, 0.1µF, 10%, 25V X5R AVX 06033C104KAT2A

8 1 C48 CAP, 0603, 22pF, 2%, 50V C0G MURATA GRM1885C1H220GA01D

9 1 D5 DIODE, SCHOTTKY 30V, 100mA CENTRAL SEMI CMDSH-3-TR

10 1 L5 IND, 3.3µH WÜRTH ELEKTRONIK 744043003

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dc2142af

DEMO MANUAL DC2142A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

11 0 Q2, Q4, Q6, Q8, Q11, Q14, Q16, Q18 XSTR, POWER MOSFET OPTION OPTION

12 2 R88, R92 RES, 0603, 20kΩ, 5% 1/10W VISHAY CRCW060320K0JNEA

13 2 R68, R87 RES, 0603, 0Ω, JUMPER VISHAY CRCW06030000Z0EA

14 0 RN1, RN2 THERMISTOR, OPTION OPTION

15 0 R5, R7, R11, R15, R16, R18, R19,

R34, R35, R37, R39, R40, R41, R43,

R44, R48,R49, R52, R55, R62, R64,

R70, R76, R101, R104, R105

RES, 0603 OPTION OPTION

16 2 R77, R94 RES, 0603, 10kΩ, 1% 1/10W VISHAY CRCW060310K0FKEA

17 1 R80 RES, 0603, 187kΩ, 1% 1/10W VISHAY CRCW0603187KFKEA

18 1 R83 RES, 0603, 23.2kΩ, 1% 1/10W VISHAY CRCW060323K2FKEA

19 1 R89 RES, 0603, 3.3Ω, 1%, 1/10W VISHAY CRCW06033R30FNEA

20 1 R90 RES, 0603, 154kΩ, 1% 1/10W VISHAY CRCW0603154KFKEA

21 1 R91 RES, 0603, 1MΩ, 5% 1/10W VISHAY CRCW06031M00JNEA

22 1 R93 RES, 0603, 681kΩ, 1% 1/10W VISHAY CRCW0603681KFEA

23 2 R95, R100 RES, 0603, 301Ω, 1% 1/10W VISHAY CRCW0603301RFKEA

24 1 R96 RES, 0603, 82.5Ω, 5% 1/10W VISHAY CRCW060382R5FKEA

25 2 R97, R98 RES, 2512, 0.01Ω, 1% 1W VISHAY WSL2512R0100FEA

26 1 R99 RES, VARIABLE 5k BOURNS 3386P-1-502-LF

27 1 UD1 IC, OSCILLATOR WITH SPREAD SPECTRUM

MODULATION LINEAR TECH. LTC6908S6-1#PBF

28 1 U3 IC, 17V, 1A, SYNCHRONOUS STEP-DOWN

REGULATOR LINEAR TECH. LTC3621EDCB-2#PBF

29 1 U4 IC, VOLTAGE-CONTROLLED PULSE WIDTH

MODULATOR LINEAR TECH. LTC6992IS6-1

30 1 U5 IC, SINGLE OP AMP LINEAR TECH. LT1803IS5

Hardware: For Demo Board Only

1 12 E1, E2, E3, E4, E5, E6, E7, E11, E13,

E14, E15, E16 TURRET MILL MAX 2501-2-00-80-00-00-07-0

2 1 JP1 HEADER, 4-PIN WURTH 620 004 111 21

3 2 JP6, JP7 HEADER, SINGLE ROW 3-PIN WURTH 620 003 111 21

4 6 J1, J2, J3, J4, J5, J6 STUD, TEST PIN PEM KFH-032-10

5 2 J7, J9 CONN, BNC, 5-PINS CONNEX 112404

6 6 LUG RING, #10 KEYSTONE 8205

7 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE 8834

8 12 NUT, BRASS 10-32 ANY #10-32

9 6 WASHER, #10 TIN PLATED BRASS ANY #10 EXT BZ TN

10 3 JP1, JP6, JP7 SHUNT WURTH 608 002 134 21

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dc2142af

DEMO MANUAL DC2142A

schematic Diagram

INTVCC1

R13 0

CIN2

10uF

1210

GND

VOUT

GND

VIN+

VFB

R47

10K

VIN

GND

R27

3.57k

C28

OPT

+C1

270uF

16V

R12

13.3k

R45

R39

OPT

R4 2.2

OPT

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

YINGYI, Y .PROD3 12/31/13

0.1uF

RUN

OFF

SW1

C24

220nF

C11

OPT

R15

OPT

R10

INTVCC1

VIN-

4.5V - 14V

COUT4

330uF

6.3V

7343

R3 1k

OPT

ITH

VFB

PGOOD

BST1

VO_SNS+

C16

2.2nF

VO_SNS-

SIZE

DATE:

IC NO. REV.

SHEET OF

TIT LE:

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

Tuesday, Decem ber 31, 2013 1 3

HIGH EFFICIENCY POLYPHASE , SYNCHRONOUS

#"$% #"&#'

N/A LTC3875EUJ / LTC3874EUFD

DEMO CIRCUIT 2142A

BUCK CONVERTER WITH VERY LOW DCR INDUCTOR

C20

220nF

TK/SS

1.0V AT 120A

R17

20k

R34

OPT

R42

100k

RUN

JP1

MODE

PS CCMBM

BST2

E13

GND

1.0uF

PLLIN

VO_SNS+

C15 220pF

RUN

C5 10nF

COUT2

100uF

1210

6.3V

OPT

BSC010NE2LSI

R14

715

VO_SNS+

4.7uF

R41

OPT

C12

220nF

R21

4.02k 1%

BG2

INTVCC1

VO_SNS-

OPT

BG1

INTVCC1

DCR=0.32m OHM

C25

1.0uF

744301025

E11

EXTVCC

0.1uF

VIN

R33

100k

3.57k

INTVCC1

R44

OPT

RN1

OPT

R40

OPT C26

OPT

R19

OPT

VIN

COUT7

100uF

1210

6.3V

COUT6

100uF

1210

6.3V

VOUT

VO_SNS-

EXTVCC

R105

OPT

CMDSH-3-TR

RN2

OPT

1 2

R48

OPT

R43

OPT C27

OPT

DCR=0.32m OHM

TG1

C10

220nF

20K

L1 0.25uH

CIN1

10uF

1210

COUT8

330uF

6.3V

7343

COUT5

330uF

6.3V

7343

VOUT

+C2

270uF

16V

E14 PGOOD

SW1

C46 4.7uF

TK/SS

COUT3

330uF

6.3V

7343

INTVCC1

CIN4

10uF

1210

R24

OPT

BSC010NE2LSI

OPT

744301025

C18

0.1uF

VIN

L2 0.25uH

R28

715

OPT

CMDSH-3-TR

TG2

CIN3

10uF

1210

BSC050NE2LS

SW2 Q5

BSC050NE2LS

VO_SNS-

COUT1

100uF

1210

6.3V

EXTVCC C LKOUT

LTC3875EUJ

TG2 21

SW2 20

BOOST2 22

SGND/PGND

BOOST1 28

SW1 30

TKSS2

SNSD2+ 11

TK/SS1

TRSET2

RUN1

RUN2

TCOMP2

ITH2

TAVG

CLKOUT 31

ITH1

PHASMD 32

MODE/PLLIN 33

ILIM 35

BG2 23

SNSA2+ 9

IFAST

VOSNS2-

VOSNS2+

ISNS2- 10

VOSNS1+

SNS1- 39

SNSD1+ 38

BG1 27

VOSNS1-

FREQ

ENTMPB

PGOOD

TG1 29

INTVCC 25

VIN 26

EXTVCC 24

SNSA1+ 40

TCOMP1

TRSET1

R46

10K

EXTCLK

TK/SS

3.01k

VOUT

R11

OPT

R35

OPT

R18

OPT

VIN

R37

OPT

R16

OPT

RUN

dc2142af

DEMO MANUAL DC2142A

schematic Diagram

R64

OPT

BG3

VOUT

CLKOUT

R55

OPT

R49

OPT

VIN

INTVCC2

ITH

L3 0.25uH

R68

R63 75k

R67

SIZE

DATE:

IC NO. REV.

SHEET OF

TIT LE:

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

Wednesday, March 05, 2014

2 3

HIGH EFFICIENCY POLYPHASE , SYNCHRONOUS

#"$% &"'#(

N/A

LTC3875EUJ / LTC3874EUFD

DEMO CIRCUIT 2142A

BUCK CONVERTER WITH VERY LOW DCR INDUCTOR

INTVCC2

CIN5

10uF

1210

R59 0 Q14

OPT

Q13

BSC010NE2LSI

Q11

OPT

744301025

C32

0.1uF

VIN

R53 0

R58

715

R62 OPT

CMDSH-3-TR

CIN6

10uF

1210

INTVCC2

R65

CIN8

10uF

1210

TK/SS

TG4

Q18

OPT

Q17

BSC010NE2LSI

Q16

OPT

744301025

VIN

C36

0.1uF

R70 OPT

R66

715

CIN7

10uF

1210

CMDSH-3-TR

Q10

BSC050NE2LS

Q15

BSC050NE2LS

COUT10

330uF

6.3V

7343

COUT9

100uF

1210

6.3V

COUT11

330uF

6.3V

7343

COUT12

100uF

1210

6.3V

SW4

R54

R61

R69

100k

COUT15

330uF

6.3V

7343

COUT14

100uF

1210

6.3V

COUT16

330uF

6.3V

7343

COUT13

100uF

1210

6.3V

R57 0

BST4

R60 0

BG4

C40

100uF

1210

6.3V

C39

100uF

1210

6.3V

INTVCC2

EXTVCC

EXTCLK

INTVCC2

C35

220nF

VOUT

L4 0.25uH

RUN

INTVCC2

C33

220nF

R52

OPT

C34

100pF

PGOOD

R56 0

Q19

2N7002A

2 3

R50 0

BST3

C30

4.7uF

C31

4.7uF

C29

1.0uF

COUT21

1.0uF

COUT20

100uF

1210

6.3V

COUT19

100uF

1210

6.3V

COUT25

100uF

1210

6.3V

COUT24

100uF

1210

6.3V

COUT22

330uF

6.3V

7343

COUT23

330uF

6.3V

7343

COUT18

330uF

6.3V

7343

COUT17

330uF

6.3V

7343

PGOOD

SW3

R51

2.2

LTC3874IUFD#PBF

MODE0

ISENSE0+ 2

ISENSE0- 3

RUN0

RUN1

ISENSE1- 6

ISENSE1+ 7

MODE1

ITH1

FREQ

ILIM

SYNC

PHASMD

TG1 14

SW1 15

BOOST1 16

BG1 17

EXTVCC 18

INTVCC 19

VIN 20

BG0 21

BOOST0 22

SW0 23

TG0 24

FAULT1B 25

LOWDCR

ITH0

GND

FAULT0B 26

TG3

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