DC1778B - Demo Manual

DEMO MANUAL DC1778B-A
LTC3883EUH
Single-Phase, Step-Down
DC/DC Controller with
Digital Power Management
DESCRIPTION
Demonstration circuit 1778B-A is a single-output, synchronous buck converter featuring the LTC3883EUH, a
single-output current mode controller with digital power
management and input current sense capability. It senses
output inductor current across a sense resistor.
The board can be populated with the LTC3883EUH-1, which
allows the user to provide bias power to the IC from an
external power supply to save on-board LDO power loss.
The output voltage of the board can be programmed from
0.5V to 5V, with output current up to 20A. The factory
default setting for the output is 1.8V.
The DC1778B-A powers up to default settings and produces power based on configuration resistors, or NVM,
without the need for any serial bus communication. This
allows easy evaluation of the DC/DC converter aspects
of the LTC3883. To fully explore the extensive digital
PERFORMANCE SUMMARY
power management features of the part, download the
LTpowerPlay® GUI software onto your PC and use LTC’s
I2C/SMBus/PMBus dongle DC1613A to connect to the
board. LTpowerPlay allows the user to reconfigure the part
on- the-fly and store the configuration in EEPROM, view
telemetry of voltage, current, temperature and fault status.
GUI DOWNLOAD
The software can be downloaded from:
http://www.linear.com/ltpowerplay
For more details and instructions of LTpowerPlay, please
refer to the LTpowerPlay for LTC3883 Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1778B-A
L, LT, LTC, LTM, Linear Technology, the Linear logo and LTpowerPlay are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Specifications are at TA = 25°C
SYMBOL
PARAMETER
VIN
Input Supply Range
6.5
12
24
V
VOUT
Output Voltage Range
IOUT = 0A to 20A, VIN = 6.5V to 24V
0.5
1.8
5.0
V
VOUT_ACC
Output Voltage Range Accuracy
IOUT = 0A to 20A, VIN = 6.5V to 24V,
VOUT = 0.5V to 5.0V
–0.5
0.5
%
IOUT
Output Current Range
0
20
A
fSW
Factory Default Switching
EFF
Peak Efficiency
CONDITIONS
VOUT = 1.8V, See Figure 6
MIN
TYP
MAX
UNITS
425
kHz
91.4
%
dc1778baf
1
DEMO MANUAL DC1778B-A
QUICK START PROCEDURE
Demonstration circuit 1778B-A makes it easy to set up
to evaluate the performance of the LTC3883. Refer to
Figure 3 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 output voltage
ripple by touching the probe tip directly across the C11.
See Figure 5 for the proper scope probe technique.
1. Make sure jumpers are in the following positions:
JUMPER
JP1
6. Check for the correct output voltage. VOUT = 1.8V ± 0.5%
(1.791V ~ 1.809V).
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 voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
8. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay for LTC3883 Quick
Start Guide for detail.
POSITION FUNCTION
OFF
Write Protection of LTC3883
JP2
FT3
GPIOB to Fault 3 (of the Connector)
JP3
CTRL0
RUN to Control 0 (of the Connector)
JP5
OFF
EXTVCC_DRV: External VCC for the LTC3883-1
JP6
ON
LED Indicator
2. With power off, connect the input power supply to VIN
and GND. Connect active load to the output.
3. Make sure RUN switch (SW1) is OFF.
4. Turn on the power at the input.
5. Turn on the RUN switch as desired.
CONNECTING A PC TO DC1778B-A
You can use a PC to reconfigure the power management
features of the LTC3883, such as: nominal VOUT, margin
set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIO and
other functionality. The DC1613A dongle may be plugged
in regardless of whether or not VIN is present.
NOTE: Make sure that the input voltage does not exceed 24V.
+12V
Power Supply
USB CABLE
VIN
12-PIN
USB to
I2C/PMBus Dongle
CONNECTOR
DC1613A
LTC3883
Demo Board
DC1778B-A
VOUT
LOAD
dc1778b-a F01
Figure 1. Demo Setup with PC
2
dc1778baf
DEMO MANUAL DC1778B-A
QUICK START PROCEDURE
Plug the dongle into the correct connector. The dongle
can be hot plugged.
DC1613A
CONNECTOR
Figure 2. Dongle Connector Locations
SHUNT
V
VOUT
LOAD
RUN
SWITCH
A
V
POWER
SUPPLY
V
Figure 3. Power Test Setup
dc1778baf
3
DEMO MANUAL DC1778B-A
QUICK START PROCEDURE
Combining DC1778B-A with Other Digital Power
Demo Boards
The DC1778B-A may be plugged together in a multiboard
array with other LTC digital power boards, using J6 and J7.
Measuring Efficiency (See Figure 4)
To accurately measure efficiency of any configuration, do
the following:
n
n
n
bias voltage and gate driver current from an external
power supply. Connect the external power supply, 4.8V
to 5.2V, to the EXTVCC pin. Obtain a DC1778B-A with an
LTC3883-1 installed from your Linear Technology Field
Applications Engineer.
To use the on-board LDO to drive INTVCC, make the
following modifications to the demo board:
n
Make sure R52 (bleeder resistor on bottom side of
board) is not installed.
Set JP6 to OFF to disable the regulator that provides
power to LEDs.
Measure VIN across the input ceramic capacitor (C7).
Measure VOUT across the output ceramic capacitor (C11).
n
Set JP5 to ON so that U3 provides the 5V drive to
INTVCC. U3 takes the place of the external power
supply.
Install R1.
To accurately measure efficiency of a demo board containing an LTC3883-1:
n
Evaluating the LTC3883 When VIN Is Below 6V
Drive INTVCC from an external source through the
pin named: INT/EXTVCC.
Set JP5 to OFF to disable U3.
For applications using an input voltage within 4.5V to 6V,
please install R5 to connect VIN directly to INTVCC. Please
be aware that in this case VIN cannot exceed 6V, otherwise
the chip will be damaged.
n
Evaluating the LTC3883-1
Measuring Output Ripple Voltage
For applications that require the highest possible efficiency, the LTC3883-1 allows the user to supply the
An accurate ripple measurement may be performed by
using the configuration in Figure 5 across C11.
n
Measure VIN across the input ceramic capacitor (C7).
Measure VOUT across the output ceramic capacitor (C11).
JP6
R1
JP5
INTVCC/
EXTVCC
4
Figure 4. Jumper Locations: JP5, JP6, R1, INTVCC Turret
dc1778baf
DEMO MANUAL DC1778B-A
QUICK START PROCEDURE
+
–
COUT
VOUT
GND
dc1778a F05
Figure 5. Measuring Output Voltage Ripple
92
91
90
89
EFFICIENCY (%)
88
87
86
85
84
12VIN, 1.8VOUT, 425kHz, RSENSE
83
12VIN, 1.5VOUT, 425kHz, RSENSE
82
12VIN, 1.2VOUT, 425kHz, RSENSE
81
12VIN, 1.0VOUT, 425kHz, RSENSE
80
0
5
10
OUTPUT CURRENT (A)
15
20
dc1778b-a F06
Figure 6. Typical Efficiency Curves, DC1778B-A Sense Resistor Current Sensing, 12VIN, fSW = 425kHz
dc1778baf
5
DEMO MANUAL DC1778B-A
QUICK START PROCEDURE
LTpowerPlay Software GUI
LTpowerPlay is a powerful Windows-based development
environment that supports Linear Technology digital power
ICs with EEPROM, including the LTC3883, LTC2974 and
LTC2978. The software supports a variety of different tasks.
You can use LTpowerPlay to evaluate Linear Technology
ICs by connecting to a demo board system. LTpowerPlay
can also be used in an offline mode (with no hardware
present) in order to build a multichip configuration file that
can be saved and reloaded at a later time. LTpowerPlay
provides unprecedented diagnostic and debug features. It
becomes a valuable diagnostic tool during board bring-up
to program or tweak the power management scheme in
a system, or to diagnose power issues when bringing up
rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus
controller to communicate with one of many potential
targets, including the LTC3880’s DC1590B demo system,
or a customer board. The software also provides an automatic update feature to keep the software current with
the latest set of device drivers and documentation. The
LTpowerPlay software can be downloaded from:
http://linear.com/ltpowerplay
To access technical support documents for LTC Digital
Power Products visit Help. View online help on the
LTpowerPlay menu.
Figure 7. LTpowerPlay Software GUI
6
dc1778baf
DEMO MANUAL DC1778B-A
GUI QUICK START PROCEDURE
LTpowerPlay Software GUI
The following procedure describes how to use LTpowerPlay
to monitor and change the settings of the LTC3883.
d.To change the output voltage to a different value, like
1.5V: In the Config tab, type 1.5 in the VOUT_COMMAND
box, like this:
1. Download and install the LTpowerPlay GUI:
http://linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the LTC3883. The
system tree on the left hand side should look like this:
b.A green message box shows for a few seconds in the
lower left hand corner, confirming that the LTC3883 is
communicating:
Then, click the “W” (PC to RAM) icon to write these register
values to the LTC3883. After finishing this step, you will
see the output voltage will change to 1.5V.
If the write is successful, this message appears:
c. In the tool bar, click the “R” (RAM to PC) icon to read
the RAM from the LTC3883. This reads the configuration
from the RAM of LTC3883 and loads it into the GUI.
e. To save the changes into the NVM: In the tool bar, click
the “RAM to NVM” button:
f. Save the demo board configuration to a (*.proj) file by
clicking the Save icon. Name it whatever you want.
dc1778baf
7
DEMO MANUAL DC1778B-A
GUI QUICK START PROCEDURE
Loading a LTC3883 Configuration (*.proj) File with the GUI
n
n
In the upper left hand corner of the GUI: File > Open > browse
to your *.proj file. This will load the file into the GUI.
n
n
Click the “Go On Line” button to link the GUI to the
existing LTC3883, as this:
Click on the “W” (PC to RAM) button. This loads the
configuration into LTC3883 RAM.
Then, you can save the configuration to the EEPROM.
Please see previous step f for details.
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART #
Required Circuit Components
1
5
C2, C10, C50, C6, C18
CAP., 0.1μF, X7R, 25V, 10%, 0603
TDK, C1608X7R1E104K080AA
2
4
C4, C5, C8, C34
CAP., 1μF, X5R, 25V, 10%, 0603
AVX, 06033D105KAT2A
3
4
C7, C9, C32, C33
CAP., 10μF, X5R, 35V, 10%, 1210
AVX, 1210DD106KAT2A
4
1
C29
CAP., 10μF, X5R, 25V, 10%, 1206
MURATA, GRM31CR61E106KA12L
5
2
C26, C27
CAP., 1μF, X7R, 25V, 10%, 1206
AVX, 12063C105KAT2A
6
2
C1, C25
CAP., 4.7μF, X5R, 10V, 10%, 0603
AVX, 0603ZD475KAT2A
7
3
C11, C12, C13
CAP., 100μF, X5R, 6.3V, 10%, 1210
AVX, 12106D107KAT2A
8
2
C14, C15
CAP., POSCAP, 330μF, 6.3V, 20%, 7343, D3L CASE
PANASONIC, 6TPF330M9L
9
1
C3
CAP., ALUM., ELECT., 150μF, 35V, 20%
SUN ELECTRONIC, 35HVP150M
10
2
Q1, Q6
XSTR., MOSFET, N-CH, 25V, 58A, TDSON-8
INFINEON, BSC050NE2LS
11
1
Q3
XSTR., MOSFET, N-CH, 25V, 100A, TDSON-8
INFINEON, BSC010NE2LSI
12
1
R23
RES., 24.9k, 1/10W, 1%, 0603
VISHAY, CRCW060324K9FKEA
13
1
R28
RES., 4.32k, 1/10W, 1%, 0603
VISHAY, CRCW06034K32FKEA
14
1
R2
RES., SENSE, 0.005Ω, 1W, 1%, 2512
PANASONIC, ERJM1WSF5M0U
15
2
R3, R4
RES., 100Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603100RFKEA
16
7
R14, R16, R22, R33, R79, R83, R90
RES., 0, 1/10W, 0603
NIC, NRC06ZOTRF
17
3
R6, R84, R85
RES., 4.99k, 1/10W, 1%, 0603
VISHAY, CRCW06034K99FKEA
18
3
R7, R12, R13
RES., 1k, 1/10W, 1%, 0603
VISHAY, CRCW06031K00FKEA
19
8
R8, R9, R10, R11, R32, R53, R49, R61 RES., 10k, 1/10W, 1%, 0603
NIC, NRC06F1002TRF
20
3
R51, R55, R60
RES., 249Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603249RFKEA
21
1
R52
RES., 30Ω, 1W, 1%, 2512
VISHAY, CRCW251230R0FKEG
22
1
R54
RES., SENSE, 0.05Ω, 1/2W, 1%, 2010
VISHAY, WSL2010R0500FEA
23
2
R56, R57
RES., 100k, 1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
PANASONIC, ERJ3EKF1003V
24
1
R77
RES., 10Ω, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKEA
8
dc1778baf
DEMO MANUAL DC1778B-A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART #
25
1
R58
RES., 3Ω, 1/10W, 1%, 0603
VISHAY, CRCW06033R00FKEA
26
1
R62
RES., 15.8k, 1/10W, 1%, 0603
VISHAY, CRCW060315K8FKEA
27
0
R17, R18, R5 (OPT)
RES., OPTION, 0603
OPT.
28
2
R19, R20
RES., 0Ω, 1/10W, 0603
NIC, NRC06ZOTRF
29
2
R21, R27
RES., 100Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603100RFKEA
30
1
L1
ND., HIGH FREQ. PWR., 0.2μH
VITEC, 59PR9875
31
1
U1
IC, LTC3883EUH, QFN 6mm × 6mm
LINEAR TECH., LTC3883EUH#10CB-1PBF-ES
32
0
C16 (OPT)
CAP., OPTION, 0603
OPT.
33
1
C17
CAP., 1000pF, X7R, 25V, 10%, 0603
AVX, 06033C102KAT2A
34
1
R15
RES., SENSE, 0.002Ω, 1W, 1%, 2512
VISHAY, WSL25122L000FEA
35
0
R17, R18(OPT)
RES., OPTION, 0603
OPT.
36
2
R19, R20
RES., 0Ω, 1/10W, 0603
NIC, NRC06ZOTRF
37
2
R21, R27
RES., 100Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603100RFKEA
38
1
L1
IND., HIGH FREQ. PWR., 0.4μH
VITEC, 59PR9875
39
1
U1
IC, LTC3883EUH, QFN 6mm × 6mm
LINEAR TECH., LTC3883EUH#10CB-1PBF-ES
CAP., POSCAP, 330μF, 4V, D3L
OPT.
Additional Circuit Components
1
0
C23, C28 (OPT)
2
1
C19
CAP., 680pF, X7R, 25V, 10%, 0603
AVX, 06033C681KAT2A
3
1
C20
CAP., 47pF, C0G, 50V, 5%, 0603
AVX, 06035A470JAT2A
4
1
C46
CAP., 0.01uF, X7R, 50V, 10%, 0603
AVX, 06035C103KAT2A
5
1
C24
CAP., 0.22uF, X5R, 25V, 10%, 0805
AVX, 08053D224KAT2A
6
2
C30, C31
CAP., 0.01uF, X5R, 50V, 10%, 0603
AVX, 06035D103KAT2A
7
1
D1
DIODE, SCHOTTKY, SOD-323
CENTRAL SEMI., CMDSH-3 TR LEAD FREE
8
2
D2, D4
LED, GREEN WATER CLEAR, 571nm @ 5mA,
4.5 ~28mcd @5mA, 0603
LITE ON LTST-C193KGKT-5A
9
1
D3
LED, RED, WATER CLEAR, 631nm @ 5mA,
7.1 ~45mcd @ 5mA, 0603
LITE-ON LTST-C193KRKT-5A
10
0
D9 (OPT)
DIODE, SOD-323
OPT.
11
0
Q2 (OPT)
XSTR., MOSFET SPEED SRS 30V 30A LFPAK
OPT.
12
0
Q4 (OPT)
XSTR., MOSFET JET SERIES LFPAK
OPT.
13
1
Q5
XSTR., GP SS, PNP, 40V, SOT-23
ON SEMI., MMBT3906LT1G
14
2
Q7, Q10
XSTR., MOSFET, P-CH, 20V, 0.58A, SOT-23
VISHAY, SI2365EDS-T1-GE3
15
2
Q8, Q9
XSTR., MOSFET, N-CH, 60V, 115MA, SOT-23
FAIRCHILD, 2N7002
16
0
R1(OPT)
RES., OPTION, 0805
OPT.
17
0
R5, R24-R26, R29-R31, R81, R82,
R86, R87, R96 (OPT)
RES., OPTION, 0603
OPT.
18
1
SW1
SWITCH, SUB MINIATURE SLIDE
DPDT 6VDC 0.3A, THRU-HOLE
C&K COMPONENTS, JS202011CQN
19
1
U5
I.C., EEPROM SERIAL-I2C, 2K-bit, TSSOP-8
MICROCHIP, 24LC025-I/ST
20
1
U3
I.C., LT1129CS8-5, S8 PACKAGE
LINEAR TECH, LT1129CS8-5#PBF
21
1
U4
I.C., LT1129CS8-3.3 S8 PACKAGE
LINEAR TECH. LT1129CS8-3.3#PBF
dc1778baf
9
DEMO MANUAL DC1778B-A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART #
Hardware
1
3
JP1, JP5, JP6
CONN., HEADER, 1×3, 2.54mm
SAMTEC, TSW-103-07-L-S
2
3
JP1,JP5,JP6
SHUNT, 2.54mm
SAMTEC, SNT-100-BK-G
3
2
TP24, TP25
CONN., JACK, BANANA, NON-INSULATED, 0.218"
KEYSTONE, 575-4
4
2
TP26, TP27
STUD, FASTENER, #10-32
PEM, KFH-032-10
5
4
TP26, TP27 (×2)
NUT, BRASS, #10-32
ANY 10-32M/S BR PL
6
2
TP26-TP27
RING, LUG, CRIMP, #10
KEYSTONE, 8205
7
2
TP26-TP27
WASHER, TIN PLATED BRASS, #10
ANY 10EXT BZ TN
8
1
J14
CONN RECEPT 2mm DUAL R/A 14POS (F)
SULLINS, NPPN072FJFN-RC
9
1
J15
HEADER 14POS 2mm R/A GOLD (M)
MOLEX, 87760-1416
10
1
J10
CONN., HEADER, 12POS, 2mm, STR DL,
THRU-HOLE
FCI, 98414-G06-12ULF
11
1
J9
CONN., BNC PC MOUNT RECEPT.
JACK, 50Ω, TF-4 POST
AMPHENOL CONNEX, 112404
12
21
TP1-TP9, TP11-TP22, TP28
TEST POINT, TURRET, 0.064" MTG. HOLE
MILL-MAX, 2308-2-00-80-00-00-07-0
10
dc1778baf
A
B
C
D
VDD25
GND
OFF
TP6
TP8
2
SC
R29
OPT
R28
4.32K
DCR SENSE
-B
*
845
OPEN
R17
R30
OPT
R25
OPT
5
0
OPEN
R18
R10
10K
PGOOD
R9
10K
NOTE:
FSW = 500 KHz FOR "A" VERSION
FSW = 500 KHz FOR "B" VERSION
R SENSE
-A
ASSY
R24
OPT
RUN
GPIOB
ALERTB
SDA
SCL
R8
10K
R23
24.9K
SYNC
R6
R7
4.99K 1K
VDD33
VDD25
TP22
ON
JP1
WP
PGOOD
VDD33
TP3
3
1
15
17
VOUT_CFG
VTRIM_CFG
0
R19
DNC
DNC
VTRIM_CFG
VOUT_CFG
FREQ_CFG
ASEL
R15
0
0.002
0
4
100
R21
R27
845
100
C17
0.22uF
1nF
ITH
TSNS
VSENSE-
VSENSE+
ISENSE-
ISENSE+
BG
SW
BOOST
TG
VIN_SNS
IIN_SNS
VIN
INTVCC
R5
BG
ISENSE+
ISENSEVSENSE+
VSENSETSNS
ITH
26
3
4
30
31
32
29
1.0 uF
OPEN
C16
R32
10k
0.55uH
0.4uH
L1,L2
C20
47pF
SW
C19
680pF
BOOST
22
R14 0
TG
23
IIN_SNS
C6
0.1uF
C2
100nF
24
1
2
28
OPT
C1
4.7uF
D1
R33
0.1uF
C18
C34
1uF
C31
0.01uF
1uF
0.005
R27
C16
R21
*
*
4
*
Q4
BSC011NE2LSI
OPT
4
C8
100
R3
R2
*
L1
R17
OPT
Q2
BSC010NE2LSI
100
R4
CUSTOMER NOTICE
2. INSTALL SHUNTS AS SHOWN.
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
*
*
R18
2
YI S.
APP ENG.
2
SCALE = NONE
HZ
PCB DES.
APPROVALS
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
C17
*
4
Q3
BSC010NE2LSI
BSC050NE2LS
Q1
C7
10uF
4
C30
0.01uF
EXTVCC_DRV
PLACE Q5 CLOSE TO L1
100nF
C9
10uF
3
OPT
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.
0
Q5
C10
R58
R1
3
R20
OPT
6.3V
DATE:
N/A
SIZE
VOUT
C32
10uF
C14
330uF
6.3V
+
LTC3883EUH FAMILY
Monday, December 21, 2015
1
DEMO CIRCUIT 1778B
SINGLE PHASE DC/DC CONVERTER
WITH INPUT CURRENT SENSE
IC NO.
TP25
R22
0
R16
0
GND
GND
TP9
ITH
VSENSE-
TP7
VSENSE-
TP27
VSENSE+
TP5
VSENSE+
VOUT
0.9V -1.8V
25A
TP26
SHEET 1
1
OF 3
REV.
A
B
C
VIN
6.5V - 14V D
GND
TP4
DATE
1-13-15
VIN
TP24
TP2
VOUT
YI S.
APPROVED
C15
330uF
6.3V
+
150uF
35V
+ C3
VIN
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C13
100uF
TECHNOLOGY
OPT
6.3V
C12
100uF
C33
10uF
PRODUCTION
DESCRIPTION
REVISION HISTORY
+ C23
C11
100uF
+ C28
TITLE: SCHEMATIC
*
R19
*
*
2512
R15
1
1
VIN
REV
ECO
Figure 8. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense
OPEN
0
R20
C5
1uF
VDD33
TP1
INT/EXTVCC
U1
LTC3883EUH
SHARE_CLK
SYNC
PGOOD
RUN
WP
GPIO
ALERT
SDA
SCL
CURRENT SENSE CONNECTIONS
OPEN
R31
OPT
16
12
14
FREQ_CFG
P1
13
20
5
10
11
ASEL
SC
SYNC
PGOOD
RUN
19
9
GPIOB
WP
8
ALERTB
6
7
SCL
R13
1K
SDA
R12
1K
R26
P2
OPT
R11
10K
VDD25
C4
1uF
18
VDD25
21
VDD33
27
INTVCC
4
GND
33
PGND
25
5
1
2
3
5
1
2
3
5
1
2
3
5
1
2
3
5
DEMO MANUAL DC1778B-A
SCHEMATIC DIAGRAM
11
dc1778baf
A
B
C
D
GND
TP19
4
3
2
1
SDA
SCL
WP
VCC
24LC025-I/ST
VSS
A2
A1
A0
U5
TO DC1613A
AUXP
SDA
GND
SCL
LGKPWR
ALERTB
GPIO_1
OUTEN_0
OUTEN_1
GND
AUXSCL
AUXSDA
J10
100nF
C50
5
5
6
7
EESDA
EESCL
EEWP
8 AUXVCC
1
2
3
4
5
6
7
8
9
10
11
12
3V3
R84
4.99K
2
ALERTB
OPT
4
OPT
R82
J15
SDA
R81
TP11
ALERTB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DEMO HEADER (M)
FAULTB
CTRL
ALERTB
SDA
SHARE_CLK
SCL
RESETB
AUXP
UNUSED
UNUSED
GND
GND
12V
12V
SCL
TP12
SDA
TP13
SCL
SC
SYNC
VIN
R86
OPT
1206
R90
0
R87
OPT
CUSTOMER NOTICE
R96
OPT
TP15
SYNC
FAULTB
CTRL
ALERTB
SDA
SHARE_CLK
SCL
RESETB
AUXP
UNUSED
UNUSED
GND
GND
12V
12V
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
YI S.
APP ENG.
2
SCALE = NONE
HZ
PCB DES.
APPROVALS
J14 DEMO HEADER (F)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R79 0
R83 0
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.
VIN
3V3
TP14
SHARE_CLK
DATE:
N/A
SIZE
RUN
OFF
ON
2
LTC3883EUH FAMILY
1
DEMO CIRCUIT 1778A
Monday, December 21, 2015
IC NO.
SGND
TP18
RUN
RUN
TP17
GPIOB
GPIOB
TP16
SHEET 2
2
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C46
10nF
R77
10
TECHNOLOGY
5
SW1
R49
10.0K
VDD33
1
SINGLE PHASE DC/DC CONVERTER
WITH INPUT CURRENT SENSE
TITLE: SCHEMATIC
D9
OPT
Figure 9. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense
R85
4.99K
3
ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN
4
4
1
12
6
3
5
A
B
C
D
DEMO MANUAL DC1778B-A
SCHEMATIC DIAGRAM
dc1778baf
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
PULSE IN
5
VIN
3V3
VIN
TP21
R53
10K
4
2
C26
1uF
VDD33
R56
100K
R62
15.8K
2
TP0101K
Q10
R61 10.0K
3
OFF
ON
JP5
EXTVCC_DRV
5V SUPPLY FOR LTC3883-1 ONLY
GND
DO NOT EXCEED 5% DUTY CYCLE!
TP20
Q6
BSC050NE2LS
DYNAMIC LOAD CIRCUIT
8
7
6
5
OUTPUT
SENSE/ADJ
GND
1
2
3
4
TP28 IOUT
TST
LT1129CS8-5
4
1
J9
VSENSE+
C24
0.22uF
NC
2
GPIOB
D2
ALERTB
VIN
OFF
ON
JP6
LED
2
R57
100K
1
CUSTOMER NOTICE
VIN
LED SUPPLY
2N7002A
Q8
GREEN
GPIOB
R51
249
C27
1uF
D3
8
7
6
5
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
ALERT
RED
NC
GND
OUTPUT
4
1
2
3
YI S.
APP ENG.
2
SCALE = NONE
HZ
PCB DES.
APPROVALS
LT1129CS8-3.3
VIN
GND
GND
SHDN
U4
PGOOD
SENSE/ADJ
TP0101K
Q7
R55
249
+3.3V
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.
1
LED INDICATOR CIRCUITS
EXTVCC_DRV
C25
4.7uF
VOUT
+3.3V
C29
10uF
DATE:
N/A
SIZE
1
LTC3883EUH FAMILY
Monday, December 21, 2015
1
DEMO CIRCUIT 1778A
SINGLE PHASE DC/DC CONVERTER
WITH INPUT CURRENT SENSE
IC NO.
R52
30
1W
2512
OPT
VOUT
VOUT
SHEET 3
2
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
BLEEDER LOADS
TECHNOLOGY
2N7002A
Q9
GREEN
TITLE: SCHEMATIC
+3.3V
1
D4
PGOOD
R60
249
+3.3V
Figure 10. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense
VIN
GND
GND
SHDN
U3
R54
0.05
VSENSE-
3
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
2
3
4
5
VOUT
5
1
2
3
4
3
2
2
3
D
3
1
1
3
1
3
2
5
A
B
C
D
DEMO MANUAL DC1778B-A
SCHEMATIC DIAGRAM
dc1778baf
13
DEMO MANUAL DC1778B-A
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
14 Linear Technology Corporation
dc1778baf
LT 0216 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2016
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