Linear Technology DC2641A Quick setup guide

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dc2641af
DEMO MANUAL DC2641A
DESCRIPTION
LTC7801EUFD
High Input Voltage
Synchronous Buck Converter
Demonstration circuit 2641A is a single output synchro-
nous buck converter featuring the LTC7801EUFD in the
24-lead QFN package. The input voltage range is from
16V to 100V and the output is 12V/10A. The DC2641A is
configured with a sense resistor for overcurrent protec-
tion. Inductor DCR current sensing is optional.
The board has a lot of features including an optional
onboard NMOS LDO for DRVCC, a switch-mode power
supply for EXTVCC, jumper selectable 100% duty cycle
operation in dropout, a mode selector pin that allows
the converter to run in CCM, pulse-skip, adjustable burst
L, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase and the Linear logo are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
PERFORMANCE SUMMARY
clamp or default Burst Mode®operation, a PGOOD output
voltage monitor and PLLIN for PolyPhase®operation.
The LTC7801 data sheet gives a complete description
of the part, operation and application information and
must be read in conjunction with this demo manual for
DC2641A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2641A
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 16V ~ 100V
Output Voltage VOUT VIN = 16~100V, IOUT = 0~10A, JP4: FCM 12V ± 2% (11.76V ~ 12.24V)
Maximum Output Current IOUT,MAX VIN = 16~100V 10A
Default Operating Frequency (Typical) 150kHz
External Clock Sync. Frequency Range 75kHz – 850kHz
Typical Full Load Efficiency (See Figure 4) VIN = 48V, VOUT = 12V, IOUT = 10A, fSW = 150 kHz 95.3%

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dc2641af
DEMO MANUAL DC2641A
QUICK START PROCEDURE
Demonstration circuit DC2641A is easy to set up to
evaluate the performance of the LTC7801EUFD. 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 V
IN
or V
OUT
and GND terminals or directly across relevant
capacitor. See Figure 2 for proper scope probe technique.
1. Place jumpers in the following positions:
JP1 ON
JP4 FCM
JP5 ON
JP8 OFF
2. With power off, connect the input power supply to VIN
and GND.
3. Turn on the power at the input.
NOTE:Make sure that the input voltage is higher than
16V and does not exceed 100V.
4. Check the output voltage. The output voltage should
be between 11.76V and 12.24V.
Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, output voltage ripple, effi-
ciency and other parameters.
NOTE:If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.

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DEMO MANUAL DC2641A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
IIN
IOUT
+
–
VIN SUPPLY
+
–
+
+
–
–
LOAD
DC2641A F01
+ –
VOUT GND
COUT
Figure 2. Measuring Input or Output Ripple Across Terminals or Directly Across Ceramic Capacitor

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DEMO MANUAL DC2641A
FREQUENCY SYNCHRONIZATION AND MODE SELECTION
Table 1. Mode Selection and Synchronized Operation Options
CONFIGURATION JP4 MODE WITH SYNC. SIGNAL APPLIED TO PLLIN
Forced Continuous Operation FCM FCM
Pulse-Skipping Operation P.S. P.S.
Burst Mode Operation with Adjustable Clamp Level Burst ADJ. FCM
Burst Mode Operation with Default Clamp Burst Default FCM
Table 2. Optional Inductor DCR Current Sensing
CONFIGURATION RS1 R24 R28 C16 R37 R38 R39 R40
Current Sense Resistor (Default) Ref. Sch. Ref. Sch. Ref. Sch. OPEN OPEN OPEN OPEN OPEN
Inductor DCR Current Sensing 0Ω Copper OPEN OPEN Calculated Value from Data Sheet 0Ω 0Ω
Demonstration circuit 2641A’s Mode selector allows the
converter to run in forced continuous operation, pulse-
skipping operation, Burst Mode or Burst mode with
adjustable clamp level by changing the position of JP4.
To synchronize the DC2641A to an external clock, apply
the sync signal to the PLLIN turret. Depending upon the
JP4 setting, the DC2641A will operate in different modes.
See Table 1 for the detailed description.
100% DUTY
Demonstration circuit 2641A features 100% duty cycle
operation in dropout. Set the JP5 to “ON”position to acti-
vate this feature. Set JP5 to “OFF” position disables the
internal charge pump and enables boost refresh, allowing
for 99% duty cycle operation in dropout.
OPTIONAL INDUCTOR DCR CURRENT SENSING
Demonstration circuit 2641A provides an optional circuit
for Inductor DCR Current Sensing. Inductor DCR Cur-
rent 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 current limit. If DCR sensing is used, be sure to
select an inductor current with a sufficiently high satura-
tion current or use an iron powder type material.
Refer to Table 2 for Optional Inductor DCR Current Sens-
ing setup and to the data sheet for more details.
Low Quiescent Current Applications and Measurement
The typical quiescent current (I
Q
) of the LTC7801 control-
ler is 40µA in sleep mode as specified in the LTC7801
data sheet. However, the input current of the DC2641A
board can be higher than this value because of additional
circuit outside of the IC. To reduce the total input current,
large value FB divider resistors should be used. In addi-
tion, some jumpers and resistors should be configured
accordingly. Refer to Table 3 for the low input quiescent
current setup.
Table 3. Low Input Quiescent Current Configuration
REFERENCE DESIGNATOR R1 R2 R23 JP3 JP4 JP5 JP8
Function OVLO PGOOD INTVCC Jumper MODE Selector 100% DUTY BIAS supply
Stuffing Option OPEN 0Ω OPEN OPEN BURST ADJ. or
BURST DEFAULT
OFF OFF

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DEMO MANUAL DC2641A
EXTVCC BIAS SUPPLY
By default, the DC2641A EXTVCC turret is tied to the 12V
VOUT.
To power the EXTVCC from on-board bias supply:
1. Leave the JP7 OPEN. This step disconnects the EXTVCC
from VOUT.
2. Keep the JP8 at the “ON” position. The on-board BIAS
supply output voltage is 12V.
Alternatively, EXTVCC can also be powered by an external
power supply:
1. Leave the JP7 OPEN.
2. Keep the JP8 at the “OFF” position.
3. Apply a DC voltage (<14V) between the EXTVCC and
GND turret, after the input voltage is established.
Ensure that EXTVCC ≤ VIN.
60
65
70
75
80
85
90
95
100
012345678910
Efficiency (%)
IOUT (A) DC2641A F03
VIN = 100V
VIN = 72V
VIN = 48V
VIN = 16V
Figure 3. DC2641A VOUT Typical Efficiency vs Load Current

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DEMO MANUAL DC2641A
EXTVCC BIAS SUPPLY
Figure 4. DC2641A VOUT 0~2.5A Load Transient at VIN = 48V
Figure 5. Thermal Image VIN 48V, VO12V at 10A No Air Flow, TA= 25°C
20MHz BW
100mV/DIV
DC2641 F04
50µs/DIV
VOUT

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DEMO MANUAL DC2641A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP., 100µF, ELECT, 200V, 20%, 16×20mm, THT, NRB-XS Series NIC NRB-XS101M200V16x20TBF
2 5 CIN3, CIN4, CIN8, C14,
C15
CAP., 2.2µF, X7R, 100V, 10%, 1812 TDK, C4532X7R2A225K230KA
3 3 CIN2, CIN6, CIN7 CAP, 1µF, X7R, 10V, 10%, 0805 AVX 0805ZC105KAT2A
4 1 COUT1 CAP, 22µF, X7R, 16V, 10%, 1210 TDK, C3225X7R1C226K250AC
5 2 COUT2, COUT3 CAP., 150µF, TANT, 16V, 20%, 7343, D-CASE AVX TPSD157M016R0125
6 3 C2, C4, C13 CAP, 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A
7 1 C3 CAP, 1000pF, X7R, 50V, 10%, 0603 AVX 06035C102KAT2A
8 1 C6 CAP, 4700pF, X7R, 50V, 10%, 0603 AVX 06035C472KAT2A
9 1 C7 CAP, 1µF, X7R, 16V, 20%, 0603 TDK, C1608X7R1C105M080AC
10 1 C9 CAP, 10pF, X7R, 50V, 10%, 0603 AVX 06035C100KAT2A
11 1 C10 CAP., 100pF, C0G, 50V, 5%, 0603 AVX 06035A101JAT2A
12 1 C11 CAP, 0.1µF, X7R, 100V, 10%, 1206 AVX 12061C104KAT2A
13 1 C12 CAP, 4.7µF, X5R, 16V, 20%, 0603 TDK C1608X5R1C475M080AC
14 1 L1 IND., 33µH, PWR, 15%, 12A, 11.4mΩ, 2013 WURTH ELEKTRONIK 7443633300
15 1 L2 IND., 470µH, PWR, 10%, 0.72A, 886mΩ, 10.0×10.2×4.8mm,
MSS1048T Series, AEC-Q200
COILCRAFT MSS1048T-474KLB
16 2 Q2, Q3 XSTR., PWR MOSFET, N-CH, 120V, 44A, PG-TDSON-8, SuperSO8 INFINEON BSC190N12NS3 G
17 1 Q4 XSTR., PWR MOSFET, N-CH, 120V, 98A, PG-TDSON-8, SuperSO8 INFINEON BSC077N12NS3 G
18 1 RS1 RES, 0.006Ω, 1%, 2W, 2512, HIGH PWR, SENSE, AEC-Q200 VISHAY WSL25126L000FEA18
19 1 R6 RES., 301kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603301KFKEA
20 1 R9 RES., 10MΩ, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW080510M0JNEA
21 1 R12 RES., 2.2Ω, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW08052R20JNEA
22 2 R13, R14 RES., 10kΩ, 5%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060310K0JNEA
23 1 R15 RES., 140kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW0603140KFKEA
24 3 R16, R17, R23 RES., 100kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603100KFKEA
25 1 R18 RES., 49.9kΩ, 1%, 1/10W, 0603 VISHAY CRCW060349K9FKEA
26 1 R25 RES., 30.1kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060330K1FKEA
27 1 R26 RES., 80.6kΩ, 1%, 1/10W, 0603 VISHAY CRCW060380K6FKEA
28 2 R30, R36 RES., 10Ω, 1%, 1/10W, 0603 VISHAY CRCW060310R0FKEA
29 1 R31 RES., 2MΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW06032M00FKEA
30 1 R32 RES., 267kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603267KFKEA
31 1 R34 RES., 196kΩ, 1%, 1/10W 0603 VISHAY CRCW0603196KFKEA
32 1 U1 IC, HIGH VOLTAGE DC/DC BUCK REG., QFN-24 (4mm×5mm) LINEAR TECH. LTC7801UFD#PBF
33 1 U2 IC, SYNCHRONOUS STEP DOWN REGULATOR, 150V, 100mA,
MSOP-16
LINEAR TECH LTC3639EMSE#PBF

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dc2641af
DEMO MANUAL DC2641A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1 0 CIN5 (OPT) CAP, OPT 1812 OPTION
2 0 COUT4 (OPT) CAP, OPTION 7343 OPTION
3 0 C1, C5, C8, C16 (OPT) CAP, OPTION 0603 OPTION
4 0 D1 (OPT) DIODE, OPTION SOD-123 OPTION
5 0 D2 (OPT) DIODE, OPTION SOD-323 OPTION
6 0 L4 (OPT) IND., 22µH, PWR, 10%, 30A, 2.05mΩ, 27.9×19.8×15.36mm,
SER2915H Series, AEC-Q200
COILCRAFT SER2915H-223KL OPTION
7 0 Q1, Q6, Q7 (OPT) XSTR, OPTION TO252-3 OPTION
8 0 Q5 (OPT) XSTR, OPTION LFPAK OPTION
9 0 Q12, Q13 (OPT) XSTR, OPT IN_PG_TS OPTION
10 0 R1 (OPT) RES, OPTION 0805 OPTION
11 8 R2, R8, R22, R24, R27,
R28, R29, R35
RES, 0Ω 1/10W 0603 VISHAY CRCW06030000Z0EA
12 0 R7, R11, R19, R20,
R21, R37, R38, R39,
R40(OPT)
RES, OPTION 0603 OPTION
13 0 R33 (OPT) RES, OPTION 1206 OPTION
Additional
1 10 E1-E10 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX 2501-2-00-80-00-00-07-0
2 3 JP1, JP2, JP5 CONN., HDR, MALE, 1×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121
3 3 JP3, JP6, JP7 CONN., HDR, MALE, 1×2, 2mm, THT, STR WURTH ELEKTRONIK, 62000211121
4 1 JP4 CONN., HDR, MALE, 2×4, 2mm, THT, STR WURTH ELEKTRONIK, 62000821121
5 4 J1, J2, J3, J4 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE KEYSTONE 575-4
6 7 XJP1, XJP2, XJP3,
XJP4, XJP5, XJP6,
XJP7
CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

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dc2641af
DEMO MANUAL DC2641A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A B B C C D D
VOUT
GND
FCM P.S. BURST ADJ. BURST DEFAULT
7443633300
MSS104BT
EXTVCC
INTVCC
INTVCC
INTVCC
VIN
INTVCC
INTVCC
INTVCC
VIN
VIN
VIN
VIN
VOSP
VOSP
TG SW BG
SW
2SW
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
Monday, April 10, 2017
11
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
Monday, April 10, 2017
11
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
Monday, April 10, 2017
11
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
DL
PRODUCTION
304/10/17
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
DL
PRODUCTION
304/10/17
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
DL
PRODUCTION
304/10/17
E10
RUN
R11 OPT
R38
OPT
JP2
ON
OFF
VBIAS
1 3 2
U1
LTC7801UFD
INTVCC 20
OVLO
21
DRVSET
9
DRVUV
10 TG 11
FREQ
8
PGOOD
7
RUN 19
SENSE1-
23
GND
25
BG 14
BOOST 13
PLLIN
6
SENSE1+
22
NDRV 16
DRVCC 15
GND
4
MODE
3
EXTVCC 18
VIN 17
SS
24
VFB
1
ITH
2
CPUMP_EN
5
SW 12
R36 10
1%
C13 0.1uF
C14
4.7uF
100V 1812
JP7
E2
VIN-
R27
0
R9 10M 0805
R29 0
Q2
BSC190N12NS3G
1
2
5
3
4
R31 2M 1%
COUT1
22uF
16V
1210
R14 10k
JP3
RS1
0.006
2512
C1 OPT
R32 267k 1%
R37 OPT
C9 10pF
L1 33uH
E8
PGOOD
J1
VIN
16V - 100V
C3
1nF
CIN4
4.7uF
100V 1812
C8 OPT
JP6
JP4
MODE
1 2 3 4 5 6 7 8
Q3 BSC190N12NS3G
1
2
5
3
4
R33 OPT
1206
Q1 OPT
23
1
+
COUT2
150uF 16V
7343
CIN5
OPT
100V 1812
E9
PLLIN
CIN6
1uF
100V
0805
R21 OPT
C7
1uF
R24 0
R34 196k
C5 OPT
C12
4.7uF
D1 OPT
R35
0
C16 OPT
R17
100k
CIN3
4.7uF 100V
1812
R13
10K
+
COUT3
150uF
16V
7343
J2
GND
C4
0.1uF
C2 0.1uF
R15
140k 1%
R25 30.1k
1%
L2 470uH
R8 0
R40 OPT
+
COUT4
OPT 7343
R18
49.9k
1%
R28 0
Q6 OPT
23
1
Q5
OPT
1
2
5
3
4
R16
100k
E6
EXTVCC
R26
80.6k 1%
R7
OPT
R12 2.2
0805
J4
GND
CIN7
1uF
100V
0805
CIN2
1uF 100V 0805
CIN8
4.7uF
100V 1812
C6 4700pF
E3
JP1
ON OFF
RUN
1 3 2
R39
OPT
+
CIN1 100uF 200V
Q7 OPT
23
1
C11
0.1uF 100V 1206
R2 0
R30 10
1%
D2 OPT
C10 100pF
E5
MODE
R23
100K
R22 0
R1
OPT 0805
R20 OPT
J3
VOUT
12V/10A
U2
LTC3639EMSE
SW 1
NC
2
VIN
3
NC
4
FBO
5
VPRG1 7 VPRG2 6
GND
8
VFB 9
SS 10
ISET
11
OVLO
12
NC
13
RUN
14
NC
15
GND
16
GND
17
R6
301k
1%
E7
SS
JP5
ON
OFF
100% DUTY
1 3 2
E1
VIN
R19
OPT
C15
4.7uF
16V 1812
E4
Q4
BSC077N12NS3G
1
2
5
3
4
SENSE1- SENSE1+
SW TG
VOUT
SENSE1+ SENSE1-
EXTVCC
BG
SW
TG
BG

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dc2641af
DEMO MANUAL DC2641A
 LINEAR TECHNOLOGY CORPORATION 2017
LT 0517 • 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
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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
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