1
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Description
LTC3871
High Power PolyPhase
®
Bi-Directional Supply/Charger
Demonstration circuit 2348A is a high power high
efficiency bi-directional synchronous buck or boost
converter featuring the LT C
®
3871 and is available in two
versions. The DC2348A-A operates with two each LTC3871
devices with four phases and the DC2348A-B utilizes one
LTC3871 device with two phases.
When operating in buck mode, this demo circuit has an
input voltage range of 30V to 75V and produces a 12V
output. When operating in boost mode, the input voltage
is from 10V to 13V and produces a 48V output voltage.
Both boards have a switch that allows the converter to
run in either buck or boost mode. A DC voltage source
can be connected to the SETCUR turret to set the average
inductor current in each phase of the converter. Both boards
also utilize a mode jumper to select forced continuous
conduction mode, buck-mode only pulse-skipping or full
pulse-skipping mode for buck and boost.
L, LT, LTC, LTM, Linear Technology, PolyPhase and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
performance summary
Synchronization to an external clock (frequency range 100
kHz to 300 kHz) is also possible on these boards.
The demo circuit senses inductor current with a sense
resistor. An optional DCR sense circuit utilizes the
inductor’s DCR as the current sensing element further
saving cost, footprint and improving efficiency.
The LTC3871 data sheet gives a complete description of
the part’s operation and application information and must
be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2348A
DC2348A-A (4-Phase)
Buck Mode
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VHIGH Supply Range 30 75 V
VLOW Output Voltage 11.8 12 12.2 V
Output Current 60 A
fSW Operating Frequency 110 kHz
Efficiency 48V to 12V at 60A 97.5 %
Boost Mode
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOW Supply Range 10 13 V
VHIGH Output Voltage 47 48 49 V
Output Current 15 A
fSW Operating Frequency 110 kHz
Efficiency 12V to 48V at 15A 97 %
2
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Quick start proceDure
performance summary
Demonstration circuit DC2348A has voltage regulation (CV)
and current regulation (CC) modes that can be evaluated.
Refer to Figure 1 for proper measurement equipment setup
and follow the procedure below:
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 across
the VHIGH or VLOW and GND terminals or directly
across relevant capacitor. See Figure 2 for proper scope
probe technique.
For CV (constant voltage) buck mode (VHIGH is the input
and VLOW is the output):
1. Place jumpers in the following positions:
JP1 ILIM OPEN
JP2 PHASE1 OPEN
JP3 MODE FCM
JP4 RUN OFF
JP6 PHASE2 GND
S1 BUCK/BOOST BUCK
2. With the power off, connect the input power supply
to VHIGH and GND. Connect the load to VLOW and
GND. The load current should be less than 60A for
DC2348A-A and less than 30A for DC2348A-B.
3. Connect the SETCUR turret according to the BUCK/
BOOST setting:
Buck: SETCUR = V5 (JP1 pin 2)
Boost: SETCUR = GND
4. Turn on the power at the input.
NOTE: Make sure that the input voltage is between
30V and 75V.
5. Change the JP4 to ON position.
6. Check for the proper output voltage (VLOW = 11.8V
to 12.2V).
NOTE: If there is no output, temporarily disconnect
the load to make sure that the load is not set too high.
7. Once the proper output voltage is established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
DC2348-B (2-Phase)
Buck Mode
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VHIGH Supply Range 30 75 V
VLOW Output Voltage 11.8 12 12.2 V
Output Current 30 A
fSW Operating Frequency 110 kHz
Efficiency 48V to 12V at 30A 97 %
Boost Mode
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOW Supply Range 10 13 V
VHIGH Output Voltage 47 48 49 V
Output Current 7.5 A
fSW Operating Frequency 110 kHz
Efficiency 12V to 48V at 7.5A 97 %
3
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Quick start proceDure
8. Disconnect the load from the DC2348A and then turn
off the input power.
For CV boost mode (VLOW is the input and VHIGH is
the output).
9. Change the S1 position from BUCK to BOOST.
10. Connect the input power supply to VLOW and GND.
Connect the load to VHIGH and GND. The load cur-
rent should be less than 15A for DC2348A-A and
less than 7.5A for DC2348A-B.
11. Turn on the input power.
NOTE: Make sure that the input voltage is between 10V
and 13V.
Check for the proper output voltage (VHIGH = 47V to 49V).
12. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
For CC (constant current) mode operation:
1. Use the same afore mentioned jumpers setting.
2. An electronic load active in CV (constant voltage)
mode is required as the current-sinking device. Set
the electronic load voltage to below 11V or below
46V for buck or boost mode respectively.
Figure 1. Proper Measurement Equipment Setup (Buck Mode)
4
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Quick start proceDure
3. With the power off, connect the input power supply
and the load according to the BUCK/BOOST setting:
POWER SUPPLY ELECTRONIC LOAD
BUCK VHIGH VLOW
BOOST VLOW VHIGH
4. Connect a DC voltage source between the SETCUR
and GND turrets. Set the initial DC voltage to 1.25V.
The valid SETCUR voltage range is 1.25V to 2V for
BUCK mode and 1.25V to 0.5V for BOOST mode.
Turn on the power and then change the JP4 to ON
position.
NOTE: Watch closely for the load current, which is pro-
portional to the SETCUR voltage. At SETCUR = 1.25V
the load current may or may not be zero, depending
upon the different ILIM settings.
5. Observe the IMON1 or IMON2 turret voltage. It should
be equal to the SETCUR voltage until the ILIM-set
current limit is hit.
6. Adjust the SETCUR back to 1.25V. Change the JP4
to OFF position. Turn off the input power.
For battery charging applications, SETCUR can be
programmed dynamically on-the-fly to set the charging
currents to the batteries in either BUCK or BOOST mode.
The BUCK/BOOST mode can also be set dynamically:
Toggle the S1 switch to the middle position and drive
the BUCK turret by a signal generator.
BUCK: 5V
BOOST: 0V
NOTE (Constant Current Mode Only): When doing the
bidirectional current transition tests, both VHIGH and
VLOW sides need a power supply and an electronic
load which is active in the CV mode. In this case, the
electronic load functions like a battery which is being
charged. Make sure the power supply voltages are
always below the same side electronic load voltages.
See Figure 3 for proper equipment setup.
Figure 2. Measuring Input or Output Ripple Across Terminals or Directly Across Bulk Capacitor
Figure 3. Proper Equipment Setup For Bidirectional Current Transition Tests (DC2348A in CC Mode)
+ –
V
OUT
GND
COUT
DC2348 F03
SETCUR GND
VLOW
SUPPLY
VLOW
DC2348A
(–A OR –B)
0.5V ~ 2V DC
VOLTAGE
–
+
+ +
VHIGH
SUPPLY
VHIGH
ELECTRONIC
LOAD (CV)
ENABLED
ELECTRONIC
LOAD (CV)
ENABLED
5
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
optionaL inDuctor Dcr current sensinG
Demonstration circuit 2348A provides an optional circuit
for Inductor DCR current sensing. Inductor DCR current
sensing uses the DCR of the inductor to sense the inductor
current instead of discrete sense resistors. The advantages
of DCR sensing are lower cost, reduced board space and
higher efficiency, but the disadvantage is a less accurate
Table 2. Optional Inductor DCR Current Sensing
Configuration CHANNEL1 RS1 R39 R26 C32
CHANNEL2 RS2 R40 R25 C33
CHANNEL3 RS3 R43 R79 C34
CHANNEL4 RS4 R49 R54 C35
Current Sense Resistor (Default) REF SCH REF SCH OPEN OPEN
Inductor DCR Current Sensing 0Ω Copper OPEN Calculated Value from Data Sheet
current limit. If DCR sensing is used, be sure to select an
inductor with sufficiently high saturation current or use
an iron powder type material.
Refer to Table 2 for Optional Inductor DCR Current Sensing
setup and to the data sheet for more details.
Figure 4. DC2348A-B Buck Mode Typical Efficiency vs Load Current
Figure 5. DC2348A-A Buck Mode Typical Efficiency vs Load Current
I
OUT
(A)
0
EFFICIENCY (%)
99
97
91
89
87
83
81
79
93
95
85
77
75 1510 25
dc2348a F04
30
5 20
VIN = 36V
VIN = 75V
VIN = 48V
IOUT (A)
0
EFFICIENCY (%)
99
97
91
89
87
83
81
79
93
95
85
77
75 3020 50
dc2348a F05
60
10 40
VIN = 36V
VIN = 75V
VIN = 48V
6
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Figure 6. DC2348A-B Thermal Image, VHIGH = 75V, VLOW = 12V, IOUT = 30A, Free Air, TA = 25°C
Figure 7. DC2348A-A Thermal Image, VHIGH = 75V, VLOW = 12V, IOUT = 60A, Free Air, TA = 25°C
Figure 8. Mode Transition from Buck to Boost
optionaL inDuctor Dcr current sensinG
7
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
parts List Dc2348a-a
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 10 C1, C14, C15, C16, C19, C53, C54, C55,
C61, C75
CAP, 1210 2.2µF 10% 100V X7R AVX 12101C225KAT2A
2 2 C2, C60 CAP, 100µF 20% 100V ELEC SUN ELECT. 100CE100KXT
3 4 C3, C4, C70, C100 CAP, 33µF 20% 80V ELEC PANASONIC EEE-FK1K330P
4 1 C5 CAP, 0603 47pF 10% 50V C0G AVX 06035A470KAT2A
5 2 C6, C9 CAP, 0603 10nF 10% 100V X7R AVX 06031C103KAT2A
6 2 C7, C39, C58 CAP, 0603 100nF 10% 50V X7R AVX 06035C104KAT2A
7 8 C8, C13, C28, C29, C45, C46, C48, C63 CAP, 0603 0.22µF 10% 25V X5R AVX 06033D224KAT2A
8 5 C10, C31, C51, C64, C107 CAP, 0805 4.7µF 10% 16V X7R AVX 0805YC475KAT2A
9 3 C11, C62, C65 CAP, 0603 100pF 10% 100V NPO AVX 06031A101KAT2A
10 2 C12, C67 CAP, 0603 10pF 10% 100V C0G AVX 06031A100KAT2A
11 6 C18, C23, C59, C71, C105, C106 CAP, 0603 1µF 10% 25V X7R MURATA GRM188R71E105KA12D
12 4 C21, C24, C47, C74 CAP, 100µF 20% 25V ALUM PANASONIC EEHZA1E101XP
13 4 C22, C25, C66, C72 CAP, 1206 10µF 10% 25V X7R MURATA GRM31CR71E106KA12L
14 4 D1, D2, D3, D4 DIODE, SCHOTTKY, RECTIFIER DIODES INC. DFLS1100-7
15 4 L1, L2, L3, L4 IND, 10µH WURTH 7443641000
16 8 Q1, Q2, Q3, Q4, Q17, Q20, Q22, Q24 XSTR, MOSFET N-CH 80V 100A TDSON-8 INFINEON BSC117N08NS5
17 8 Q5, Q6, Q7, Q8, Q18, Q19, Q21, Q23 XSTR, MOSFET N-CH 80V 100A TDSON-8 INFINEON BSC040N08NS5
18 2 Q33, Q34 XSTR, SIPMOS, P-CHANNEL VISHAY SUD50P08-25L
19 4 RS1, RS2, RS3, RS4 RES, 2010 0.001Ω 1% 1W VISHAY WSL20101L000FEA18
20 1 R1 RES, 0603 649kΩ 1% 1/10W VISHAY CRCW0603649KFKEA
21 1 R2 RES, 0603 243kΩ 1% 1/10W VISHAY CRCW0603243KFKEA
22 1 R3 RES, 0603 200kΩ 1% 0.1W VISHAY CRCW0603200KFKEA
23 23 R4, R12, R14, R21, R24, R30, R33,
R34, R35, R39, R40, R43, R49, R67,
R72, R80, R82, R85, R86, R87, R88,
R89, R90
RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
24 1 R5 RES, 0603 69.8kΩ 1% 0.1W VISHAY CRCW060369K8FKEA
25 1 R6 RES, 0603 12.7kΩ 1% 1/10W VISHAY CRCW060312K7FKEA
26 8 R7, R8, R9, R17, R27, R36, R46, R48 RES, 0603 10kΩ 1% 1/10W VISHAY CRCW060310K0FKEA
27 1 R10 RES, 0603 3.01kΩ 1% 1/10W VISHAY CRCW06033K01FKEA
28 1 R11 RES, 0603 4.53kΩ 1% 1/10W VISHAY CRCW06034K53FKEA
29 2 R13, R47 RES, 0603 20kΩ 1% 1/10W VISHAY CRCW060320K0FKEA
30 1 R15 RES, 0603 110kΩ 1% 1/10W VISHAY CRCW0603110KFKEA
31 1 R16 RES, 0805 499kΩ 1% 1/8W VISHAY CRCW0805499KFKEA
32 1 R18 RES, 0603 100kΩ 5% 1/10W VISHAY CRCW0603100KJNEA
33 1 R22 RES, 0603 90.9kΩ 1% 1/10W VISHAY CRCW060390K9FKEA
34 2 R23, R81 RES, 0603 10Ω 1% 1/10W VISHAY CRCW060310R0FKEA
35 2 R29, R78 RES, 1206 2.2Ω 1% 1/4W VISHAY CRCW12062R20FKEA
36 4 R31, R32, R53, R65 RES, 0603 4.99kΩ 1% 0.1W VISHAY CRCW06034K99FKEA
37 4 R38, R41, R42, R50 RES, 0603 300Ω 1% 0.1W VISHAY CRCW0603300RFKEA
38 2 R44, R51 RES, 0603 34kΩ 1% 0.1W VISHAY CRCW060334K0FKEA
8
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
parts List Dc2348a-a
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
39 2 R83, R84 RES, 2512 0Ω JUMPER VISHAY CRCW25120000Z0EG
40 2 U1, U2 IC, HIGH POWER BiDIRECTIONAL SUPPLY LINEAR TECH LTC3871HLXE#PBF
Additional Demo Board Circuit Components
1 0 C20, C27, C73, C76 CAP, ALUM OPTION OPTION
2 0 C30, C32, C33, C34, C35, C92, C93,
C98, C99, C101, C102, C103, C104
CAP, 0603 OPTION OPTION
3 0 C88, C89, C90, C91, C94, C95, C96,
C97, C108, C109, C110, C111, C112,
C113, C114, C115
CAP, 0805 OPTION OPTION
4 0 L1, L2, L3, L4 - ALTERNATE IND, 10µH COILCRAFT SER2918H-103
5 0 Q9, Q10, Q11, Q12, Q13, Q14, Q15,
Q16, Q25, Q26, Q27, Q28, Q29, Q30,
Q31, Q32
XSTR, MOSFET OPTION INFINEON IPD60N10S4-12 OPTION
6 0 R19, R20 RES, 0603 OPTION OPTION
7 0 R25, R26, R54, R79 RES, 1206 OPTION OPTION
Hardware: For Demo Board Only
1 16 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10,
E11, E12, E13, E14, E15, E17
TURRET MIIL-MAX 2501-2-00-80-00-00-07-0
2 3 JP1, JP2, JP6 HEADER, 4PIN, DBL ROW 2mm WURTH ELEKTRONIK 62000821121
3 1 JP3 HEADER, 4PIN, 2mm WURTH ELEKTRONIK 62000411121
4 1 JP4 HEADER, 2mm, 3PIN WURTH ELEKTRONIK 62000311121
6 8 J1, J2, J3, J4, J5, J8, J9, J13 STUD, TESTPIN PEM KFH-032-10
7 8 LUG RING, #10 KEYSTONE 8205
8 16 NUT, BRASS 10-32 ANY #10-32
9 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE 8834
10 8 WASHER, #10 TIN PLATED BRASS ANY #10 EXT BZ TN
11 1 S1 SWITCH, SUBMINATURE, SLIDE, SPDT C&K-COMPONENTS JS202011CQN
12 5 XJP1, XJP3, XJP4, XJP6, XJP7 SHUNT, 2mm WURTH ELEKTRONIK 60800213421
9
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
parts List Dc2348a-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 5 C1, C14, C15, C16, C19 CAP, 1210 2.2µF 10% 100V X7R AVX 12101C225KAT2A
2 1 C2 CAP, 100µF 20% 100V ELEC SUN ELECT. 100CE100KXT
3 2 C3, C4 CAP, 33µF 20% 80V ELEC PANASONIC EEE-FK1K330P
4 1 C5 CAP, 0603 47pF 10% 50V C0G AVX 06035A470KAT2A
5 2 C6, C9 CAP, 0603 10nF 10% 100V X7R AVX 06031C103KAT2A
6 2 C7, C39 CAP, 0603 100nF 10% 50V X7R AVX 06035C104KAT2A
7 4 C8, C13, C28, C29 CAP, 0603 0.22µF 10% 25V X5R AVX 06033D224KAT2A
8 2 C10, C31 CAP, 0805 4.7µF 10% 16V X7R AVX 0805YC475KAT2A
9 1 C11 CAP, 0603 100pF 10% 100V NPO AVX 06031A101KAT2A
10 1 C12 CAP, 0603 10pF 10% 100V C0G AVX 06031A100KAT2A
11 3 C18, C23, C105 CAP, 0603 1µF 10% 25V X7R MURATA GRM188R71E105KA12D
12 2 C21, C24 CAP, 100µF 20% 25V ALUM PANASONIC EEHZA1E101XP
13 2 C22, C25 CAP, 1206 10µF 10% 25V X7R MURATA GRM31CR71E106KA12L
14 2 D1, D2 DIODE, SCHOTTKY, RECTIFIER DIODES INC. DFLS1100-7
15 2 L1, L2 IND, 10µH WURTH 7443641000
16 4 Q1, Q2, Q3, Q4 XSTR, MOSFET N-CH 80V 100A TDSON-8 INFINEON BSC117N08NS5
17 4 Q5, Q6, Q7, Q8 XSTR, MOSFET N-CH 80V 100A TDSON-8 INFINEON BSC040N08NS5
18 2 Q33, Q34 XSTR, SIPMOS, P-CHANNEL VISHAY SUD50P08-25L
19 2 RS1, RS2 RES, 2010 0.001Ω 1% 1W VISHAY WSL20101L000FEA18
20 1 R1 RES, 0603 649kΩ 1% 1/10W VISHAY CRCW0603649KFKEA
21 1 R2 RES, 0603 243kΩ 1% 1/10W VISHAY CRCW0603243KFKEA
22 1 R3 RES, 0603 200kΩ 1% 0.1W VISHAY CRCW0603200KFKEA
23 11 R4, R12, R14, R21, R24, R30,
R33, R34, R35, R39, R40
RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
24 1 R5 RES, 0603 69.8kΩ 1% 0.1W VISHAY CRCW060369K8FKEA
25 1 R6 RES, 0603 12.7kΩ 1% 1/10W VISHAY CRCW060312K7FKEA
26 6 R7, R8, R9, R17, R27, R36 RES, 0603 10kΩ 1% 1/10W VISHAY CRCW060310K0FKEA
27 1 R10 RES, 0603 3.01kΩ 1% 1/10W VISHAY CRCW06033K01FKEA
28 1 R11 RES, 0603 4.53kΩ 1% 1/10W VISHAY CRCW06034K53FKEA
29 1 R13 RES, 0603 20kΩ 1% 1/10W VISHAY CRCW060320K0FKEA
30 1 R15 RES, 0603 110kΩ 1% 1/10W VISHAY CRCW0603110KFKEA
31 1 R16 RES, 0805 499kΩ 1% 1/8W VISHAY CRCW0805499KFKEA
32 1 R18 RES, 0603 100kΩ 5% 1/10W VISHAY CRCW0603100KJNEA
33 1 R22 RES, 0603 90.9kΩ 1% 1/10W VISHAY CRCW060390K9FKEA
34 1 R23 RES, 0603 10Ω 1% 1/10W VISHAY CRCW060310R0FKEA
35 1 R29 RES. 1206 2.2Ω 1% 1/4W VISHAY CRCW12062R20FKEA
36 2 R31, R32 RES, 0603 4.99kΩ 1% 0.1W VISHAY CRCW06034K99FKEA
37 1 R44 RES, 0603 34kΩ 1% 0.1W VISHAY CRCW060334K0FKEA
38 2 R38, R41 RES, 0603 300Ω 1% 0.1W VISHAY CRCW0603300RFKEA
39 2 R83, R84 RES, 2512 0Ω JUMPER VISHAY CRCW25120000Z0EG
40 1 U1 IC, HIGH POWER BiDIRECTIONAL SUPPLY LINEAR TECH LTC3871HLXE#PBF
10
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
parts List Dc2348a-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1 0 C20, C27 CAP, ALUM OPTION OPTION
2 0 C30, C32, C33, C92, C93,
C101, C102
CAP, 0603 OPTION OPTION
3 0 C88, C89, C90, C91, C108,
C109, C110, C111
CAP, 0805 OPTION OPTION
4 0 L1, L2 - ALTERNATE IND, 10µH COILCRAFT SER2918H-103
5 0 Q9, Q10, Q11, Q12, Q13, Q14,
Q15, Q16
XSTR, MOSFET OPTION INFINEON IPD60N10S4-12 OPTION
6 0 R19, R20 RES, 0603 OPTION OPTION
7 0 R25, R26 RES, 1206 OPTION OPTION
8 1 S1 SWITCH, SUBMINATURE, SLIDE, SPDT C&K-COMPONENTS JS202011CQN
9 4 XJP1, XJP4, XJP6, XJP7 SHUNT, 2mm WURTH ELEKTRONIK 60800213421
Hardware: For Demo Board Only
1 13 E1, E2, E3, E4, E5, E8, E9,
E10, E11, E12, E13, E14, E15
TURRET MIIL-MAX 2501-2-00-80-00-00-07-0
2 2 JP1, JP2 HEADER, 4PIN, DBL ROW 2mm WURTH ELEKTRONIK 62000821121
3 1 JP3 HEADER, 4PIN, 2mm WURTH ELEKTRONIK 62000411121
4 1 JP4 HEADER, 2mm, 3PIN WURTH ELEKTRONIK 62000311121
5 5 J1, J2, J3, J4, J5 STUD, TESTPIN PEM KFH-032-10
6 5 LUG RING, #10 KEYSTONE 8205
7 10 NUT, BRASS 10-32 ANY #10-32
8 5 WASHER, #10 TIN PLATED BRASS ANY #10 EXT BZ TN
9 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE 8834
11
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
schematic DiaGram
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
7443641000
7443641000
PCB NO.
PHMD CLKIN CLKOUT CH2
GND
1/4 V5
3/4 V5
FLOAT
V5
0
0
0
0
90
60
60
90
45
240
180
180
180
180
120
VIN
VIN
VOUT
VOUT
VINP VIN
VOUT
V5
VOUT
V5
V5
V5
VINP
VIN
V5 V5
V5
VINP VIN VINP VIN
V5
VIN
RUN2
RUN1
DRVSET
CLKOUT
SS2
SETCUR
BUCK
ITHIN2
ITHO2
MODE
FBO2
OVIN
UVIN
OVOUT
FAULT_
ILIM
BG1
SW1
TG1
BG2
TG2
SW2
FBIN
EXTVCC
VO
IMON1
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
3
Tuesday, June 28, 2016
13
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
13
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
13
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
R7
10k
1%
JP4
ON
OFF
RUN
1
3
2
R29
2.2
1%
1206
Q8
BSC040N08NS5
3
1
2
4
5
R11
4.53k
1%
R8
10k
1%
R41 300 1%
R3 200K 1%
+
C3
33uF
80V
Q6
BSC040N08NS5
3
1
2
4
5
E8
RUN
R1
649k
1%
C33
OPT
R44
34k
1%
R30
0
E15
GND
R39
0
R9
10k
1%
J1
VHIGH
30V UP TO 75V
+
C21
100uF
R84 0
2512
R15
110k
1%
J3
VLOW
Q33
SUD50P08-25L
2 3
1
Q5
BSC040N08NS5
3
1
2
4
5
RS2
1m
C32
OPT
R24
0
E4
BUCK/BOOST
R32
4.99K
1%
C6 10nF
R13
20k
1%
C16
2.2uF
100V
C14
2.2uF
R35 0
R25
OPT
1206
C39
100nF
C18
1uF
Q34
SUD50P08-25L
2 3
1
R17
10k
1%
D2
DFLS1100
C11 100pF
E12 GND
C7 100nF
R40
0
R38 300 1%
D1
DFLS1100
U1
LTC3871HLXE
SS
1
ITHHIGH
4
VFBHIGH 5
V5 6
OVHIGH 8
UVHIGH 9
SGND
7
ITHLOW
3
VFBLOW 2
IMON
11
OVLOW
10
SNSD2+ 15
SETCUR
12
SNSA1+ 48
RUN
18
FAULT_
19
BUCK
16
ILIM
17
SNSD1+ 46
SNS1- 47
SNS2- 14
SNSA2+ 13
DRVSET
20
NC
21
TG2 22
SW2 23
BST2 24
BG2 25
PGND2
26
EXTVCC 27
SGND
28
DRVCC
29
NC
30
VHIGH 31
NC
32
PGATE 33
NC
34
PGND1
35
BG1 36
BST1 37
SW1 38
TG1 39
NC
40
CLKOUT
41
SYNC
42
FREQ
43
MODE
44
PHSMD
45
C1
2.2uF
100V
1210
E5
SETCUR
R34 0
R23
10
1%
R22
90.9k
1%
R14 0
L1
10uH
Q3
BSC117N08NS5
3
1
2
4
5
R26
OPT 1206
R2
243k
1%
C12
10pF
C13
0.22uF
E10
CLKOUT1
C19
2.2uF
100V
J4
VLOW
J2
GND
+
C24
100uF
R83 0
2512
E9
FAULT
R20
OPT
+
C20
OPT
S1
BUCK
BOOST
1
2
34
5
6
E2
IMON1
R36
10k
1%
JP1
ILIM
ILIM
1 2
3 4
5 6
7 8
JP3
FCM
BUCK P.S.
MODE
P.S.
1
3
2
4
C22
10uF
Q4
BSC117N08NS5
3
1
2
4
5
R18
100K
E1 EXTVCC
+
C2
100uF
100V
L2 10uH
C31
4.7uF
16V
0805
C105
1uF
R12 0
+
C27
OPT
R31
4.99K
1%
+
C4
33uF
80V
E3
SYNC
E11 VHIGH
R33 0
Q2
BSC117N08NS5
3
1
2
4
5
Q1
BSC117N08NS5
3
1
2
4
5
C8
0.22uF
Q7
BSC040N08NS5
3
1
2
4
5
C28
0.22uF R27
10k
1%
R5 69.8K 1%
C25
10uF
C5 47pF
E13 VLOW
R10
3.01k
1%
J5
GND
E14
VIN
JP2
PHASE1
1 2
3 4
5 6
7 8
C29 0.22uF
C9
10nF
C30
OPT
C15
2.2uF
C10
4.7uF
0805
RS1
1m
C23
1uF
R21 0
R19
OPT
BG2
SW1
SAC1
VOUT
SDC1
SW2
TG2
DRVCC
DRVCC
DRVCC
SAC2
SAC2
SDC2 SDC2
FBOUT
FBOUT
FBIN
VOUT
ILIM SS
PHMD1
ITHO
ITHIN
ILIM
MODE
OVOUT
IMON1
SETCUR
BUCK
RUN1
FAULT_
OVIN
UVIN
SW1
TG1
PGATE
EXTVCC
BG1
SDC1
SAC1
12
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
schematic DiaGram
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
7443641000
7443641000
PCB NO.
VIN
VIN
VOUT
VOUT
V5_2 VIN
V5_2
V5_2
FBIN2
ITHIN2
ITHO2 FBO2
SS2
MODE
CLKOUT
OVIN
UVIN
OVOUT
SETCUR
BUCK
ILIM
RUN2
FAULT_
DRVSET
TG201
SW201
BG201
BG202
SW202
TG202
EXTVCC
VO
IMON1
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
3
Tuesday, June 28, 2016
23
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
23
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
23
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
RS3
1m
R53
4.99K
1%
R47
20k
1%
D4
DFLS1100
C71
1uF
R88 0
C54
2.2uF
100V
C65
100pF
L310uH
Q18
BSC040N08NS5
3
1
2
4
5
J9
VLOW
C58
100nF
D3
DFLS1100
Q23
BSC040N08NS5
3
1
2
4
5
C48 0.22uF
C64
4.7uF
0805
R72 0
C61 2.2uF
R78
2.2
1%
E7
CLKOUT2
R90 0
R51
34k
1%
C106
1uF
C63
0.22uF
R50 300 1%
Q20
BSC117N08NS5
3
1
2
4
5
E17
GND
J8
VLOW
12V /
R87 0
C45 0.22uF
C46
0.22uF
C62
100pF
R67 0
C67
10pF
R65
4.99K
1%
JP6
PHASE2
1 2
3 4
5 6
7 8
J13
GND
U2
LTC3871HLXE
SS
1
ITHHIGH
4
VFBHIGH 5
V5 6
OVHIGH 8
UVHIGH 9
SGND
7
ITHLOW
3
VFBLOW 2
IMON
11
OVLOW
10
SNSD2+ 15
SETCUR
12
SNSA1+ 48
RUN
18
FAULT_
19
BUCK
16
ILIM
17
SNSD1+ 46
SNS1- 47
SNS2- 14
SNSA2+ 13
DRVSET
20
NC
21
TG2 22
SW2 23
BST2 24
BG2 25
PGND2
26
EXTVCC 27
SGND
28
DRVCC
29
NC
30
VHIGH 31
NC
32
PGATE 33
NC
34
PGND1
35
BG1 36
BST1 37
SW1 38
TG1 39
NC
40
CLKOUT
41
SYNC
42
FREQ
43
MODE
44
PHSMD
45
R46
10k
1%
R86 0
R54
OPT
1206
C72
10uF
C75
2.2uF
Q22
BSC117N08NS5
3
1
2
4
5
C66
10uF
R81
10
1%
C51
4.7uF
16V
0805
R49
0
R42 300 1%
+
C76
OPT
C55
2.2uF
100V
Q19
BSC040N08NS5
3
1
2
4
5
Q21
BSC040N08NS5
3
1
2
4
5
R48
10k
1% R79
OPT
1206
+
C47
100uF
C59
1uF
R80 0
L4 10uH
R85 0
R82 0
Q17
BSC117N08NS5
3
1
2
4
5
C35
OPT
C107
4.7uF
0805
R89 0
C34
OPT
+
C73
OPT
Q24
BSC117N08NS5
3
1
2
4
5
+
C74
100uF
R43
0
E6
IMON2
RS4
1m
SW201
SW202
SAC102
VOUT
SDC102
SW202
TG202
DRVCC2
DRVCC2
SAC202
SAC202
VOUT
SDC202
PHMD2
BG201
BG202
SW201
TG201
EXTVCC
IMON2
SDC202
SAC102
SDC102
DRVCC2
13
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
schematic DiaGram
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
VIN
VIN
VIN
VIN
VINP
TG1
BG1
SW1
TG2
BG2
SW2
TG201
BG201
SW201
TG202
SW202
BG202
FBIN
FBIN2
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
3
Tuesday, June 28, 2016
33
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
33
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
33
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-A
BI-DIRECTIONAL SUPPLY/CHARGER
Q32
OPT
23
1
Q31
OPT
23
1
C103
OPT
Q14
OPT
23
1
C97
OPT
0805
C108
OPT
0805
Q30
OPT
23
1
C93
OPT
R4
0
+
C70
33uF
80V
Q12
OPT
23
1
C110
OPT
0805
C95
OPT
0805
Q25
OPT
23
1
C94
OPT
0805
C53
2.2uF
100V
1210
C91
OPT
0805
Q13
OPT
23
1
C89
OPT
0805
C112
OPT
0805
R6
12.7k
1%
C114
OPT
0805
Q11
OPT
23
1
C88
OPT
0805
C102
OPT
Q29
OPT
23
1
Q16
OPT
23
1
Q27
OPT
23
1
C99
OPT
R16
499k
1%
0805
C104
OPT
C109
OPT
0805
C96
OPT
0805
+
C100
33uF
80V
C92
OPT
+
C60
100uF
100V
C111
OPT
0805
C98
OPT
C90
OPT
0805
Q28
OPT
23
1
C113
OPT
0805
C115
OPT
0805
Q9
OPT
23
1
Q15
OPT
23
1
Q10
OPT
23
1
C101
OPT
Q26
OPT
23
1
FBIN
SW1
BG1
TG1
SW2
BG2
TG2
SW201
BG201
TG201
SW202
BG202
TG202
14
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
schematic DiaGram
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
7443641000
7443641000
PCB NO.
PHMD CLKIN CLKOUT CH2
GND
1/4 V5
3/4 V5
FLOAT
V5
0
0
0
0
90
60
60
90
45
240
180
180
180
180
120
VIN
VIN
VOUT
VOUT
VINP VIN
VOUT
V5
VOUT
V5
V5
V5
VINP
VIN
V5 V5
V5
VINP VIN VINP VIN
V5
VIN
RUN2
RUN1
DRVSET
CLKOUT
SS2
SETCUR
BUCK
ITHIN2
ITHO2
MODE
FBO2
OVIN
UVIN
OVOUT
FAULT_
ILIM
BG1
SW1
TG1
BG2
TG2
SW2
FBIN
EXTVCC
VO
IMON1
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
3
Tuesday, June 28, 2016
12
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
12
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
12
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
R7
10k
1%
JP4
ON
OFF
RUN
1
3
2
R29
2.2
1%
1206
Q8
BSC040N08NS5
3
1
2
4
5
R11
4.53k
1%
R8
10k
1%
R41 300 1%
R3 200K 1%
+
C3
33uF
80V
Q6
BSC040N08NS5
3
1
2
4
5
E8
RUN
R1
649k
1%
C33
OPT
R44
34k
1%
R30
0
E15
GND
R39
0
R9
10k
1%
J1
VHIGH
30V UP TO 75V
+
C21
100uF
R84 0
2512
R15
110k
1%
J3
VLOW
Q33
SUD50P08-25L
2 3
1
Q5
BSC040N08NS5
3
1
2
4
5
RS2
1m
C32
OPT
R24
0
E4
BUCK/BOOST
R32
4.99K
1%
C6 10nF
R13
20k
1%
C16
2.2uF
100V
C14
2.2uF
R35 0
R25
OPT
1206
C39
100nF
C18
1uF
Q34
SUD50P08-25L
2 3
1
R17
10k
1%
D2
DFLS1100
C11 100pF
E12 GND
C7 100nF
R40
0
R38 300 1%
D1
DFLS1100
U1
LTC3871HLXE
SS
1
ITHHIGH
4
VFBHIGH 5
V5 6
OVHIGH 8
UVHIGH 9
SGND
7
ITHLOW
3
VFBLOW 2
IMON
11
OVLOW
10
SNSD2+ 15
SETCUR
12
SNSA1+ 48
RUN
18
FAULT_
19
BUCK
16
ILIM
17
SNSD1+ 46
SNS1- 47
SNS2- 14
SNSA2+ 13
DRVSET
20
NC
21
TG2 22
SW2 23
BST2 24
BG2 25
PGND2
26
EXTVCC 27
SGND
28
DRVCC
29
NC
30
VHIGH 31
NC
32
PGATE 33
NC
34
PGND1
35
BG1 36
BST1 37
SW1 38
TG1 39
NC
40
CLKOUT
41
SYNC
42
FREQ
43
MODE
44
PHSMD
45
C1
2.2uF
100V
1210
E5
SETCUR
R34 0
R23
10
1%
R22
90.9k
1%
R14 0
L1
10uH
Q3
BSC117N08NS5
3
1
2
4
5
R26
OPT 1206
R2
243k
1%
C12
10pF
C13
0.22uF
E10
CLKOUT1
C19
2.2uF
100V
J4
VLOW
J2
GND
+
C24
100uF
R83 0
2512
E9
FAULT
R20
OPT
+
C20
OPT
S1
BUCK
BOOST
1
2
34
5
6
E2
IMON1
R36
10k
1%
JP1
ILIM
1 2
3 4
5 6
7 8
JP3
FCM
BUCK P.S.
MODE
P.S.
1
3
2
4
C22
10uF
Q4
BSC117N08NS5
3
1
2
4
5
R18
100K
E1 EXTVCC
+
C2
100uF
100V
L2 10uH
C31
4.7uF
16V
0805
C105
1uF
R12 0
+
C27
OPT
R31
4.99K
1%
+
C4
33uF
80V
E3
SYNC
E11 VHIGH
R33 0
Q2
BSC117N08NS5
3
1
2
4
5
Q1
BSC117N08NS5
3
1
2
4
5
C8
0.22uF
Q7
BSC040N08NS5
3
1
2
4
5
C28
0.22uF R27
10k
1%
R5 69.8K 1%
C25
10uF
C5 47pF
E13 VLOW
R10
3.01k
1%
J5
GND
E14
VIN
JP2
PHASE1
1 2
3 4
5 6
7 8
C29 0.22uF
C9
10nF
C30
OPT
C15
2.2uF
C10
4.7uF
0805
RS1
1m
C23
1uF
R21 0
R19
OPT
BG2
SW1
SAC1
VOUT
SDC1
SW2
TG2
DRVCC
DRVCC
DRVCC
SAC2
SAC2
SDC2 SDC2
FBOUT
FBOUT
FBIN
VOUT
ILIM SS
PHMD1
ITHO
ITHIN
ILIM
MODE
OVOUT
IMON1
SETCUR
BUCK
RUN1
FAULT_
OVIN
UVIN
SW1
TG1
PGATE
EXTVCC
BG1
SDC1
SAC1
15
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
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
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
VIN
VIN
FBIN2
TG1
BG1
SW1
TG2
BG2
SW2
FBIN
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
3
Tuesday, June 28, 2016
22
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
22
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
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
3
Tuesday, June 28, 2016
22
HIGH POWER POLY-PHASE
N/A LTC3871HLXE#PBF
DEMO CIRCUIT 2348A-B
BI-DIRECTIONAL SUPPLY/CHARGER
Q14
OPT
23
1
R6
12.7k
1%
C108
OPT
0805
C93
OPT
C110
OPT
0805
C91
OPT
0805
C89
OPT
0805
R4
0
Q13
OPT
23
1
Q9
OPT
23
1
C88
OPT
0805
Q12
OPT
23
1
C102
OPT
Q16
OPT
23
1
C109
OPT
0805
C92
OPT
C111
OPT
0805
Q11
OPT
23
1
C90
OPT
0805
R16
499k
1%
0805
Q10
OPT
23
1
Q15
OPT
23
1
C101
OPT
FBIN
SW1
BG1
TG1
SW2
BG2
TG2
16
dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0816 • 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
Copyright © 2004, Linear Technology Corporation
