DC2240A - Demo Manual

DEMO MANUAL DC2240A
LT8714
Synchronous Four-Quadrant
Converter
Description
Demonstration circuit 2240A is a synchronous fourquadrant converter featuring the LT® 8714 switching
controller. The LT8714 can regulate to positive, negative,
or zero volts when configured as a four-quadrant topology. The DC2240A regulates from a 10V to 14V input
source to an adjustable output voltage from positive 5V
to negative 5V with a 5A maximum current rating, and
operates at 200kHz switching frequency.
The LT8714 incorporates a power good feature to let
the user know if the output voltage is within its target
regulation voltage.
The LT8714 has an output voltage control (CTRL) pin
which sets the output voltage. The DC2240A has a
Performance Summary
PARAMETER
jumper to select the CTRL pin voltage source from either
externally (EXT) or internally (INT). If selected internally,
the output voltage can be set to +5V or –5V. If selected
externally, the output voltage can vary between positive
5V and negative 5V, following a 0.1V – 1V CTRL signal
with high bandwidth.
The LT8714 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 2240A.
Design files for this circuit board are available at
http://www.linear.com/8714
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.
Specifications are at TA = 25°C
CONDITIONS
Input Voltage
MIN
TYP
MAX
10
12
14
UNITS
V
Positive Output Voltage (Max)
VIN = 10V – 14V
4.85
5
5.15
V
Negative Output Voltage (Max)
VIN = 10V – 14V
–4.85
–5
–5.15
V
Maximum Output Current
5
A
Positive Output Voltage Ripple
VIN = 10V – 14V, VOUT = 5V, IOUT = 5A (20MHz BW)
25
mVP-P
Negative Output Voltage Ripple
VIN = 10V – 14V, VOUT = –5V, IOUT = –5A (20MHz BW)
25
mVP-P
Typical Switching Frequency
Efficiency
200
kHz
VIN = 12V, VOUT = 5V, IOUT = 5A
89
%
VIN = 12V, VOUT = –5V, IOUT = –5A
80
%
Figure 1. DC2240A Connection Diagram
dc2240af
1
DEMO MANUAL DC2240A
Quick Start Procedure
Demonstration circuit 2240A is easy to set up to evaluate the performance of the LT8714. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1. With the power off, connect the input power supply to
the board through VIN and PGND terminals. Connect
the load to the terminals VOUT and PGND on the board.
Make sure that the input power supply has sufficient
current rating at minimum input voltage for the required
output load.
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not
exceed 14V.
+
+
–
+
VIN
–
IIN
3. Check for the proper output voltages. The output should
be regulated at +5.0V (±3%).
If there is no output, temporarily disconnect the load
to make sure that the load is not set too high.
4. Once the proper output voltage is established, adjust
the input voltage and load current within the operating
range and observe the output voltage regulation, ripple
voltage, efficiency and other parameters.
NOTE: When measuring the input or output voltage
ripples, 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 VIN and PGND, or VOUT and PGND terminals. See
Figure 2 for proper scope probe technique.
+
–
IOUT
–
+
POWER
SUPPLY
–
VOUT
DC2240A F01
Figure 1. Proper Measurement Equipment Setup
2
dc2240af
DEMO MANUAL DC2240A
Quick Start Procedure
INPUT OR OUTPUT CAPACITOR
Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple
100
95
EFFICIENCY (%)
90
85
80
75
70
65
60
55
VIN = 10V, VO = +5V
VIN = 12V, VO = +5V
VIN = 14V, VO = +5V
VIN = 10V, VO = –5V
VIN = 12V, VO = –5V
VIN = 14V, VO = –5V
50
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT CURRENT (A)
DC2240A F03
Figure 3. Typical Efficiency Curve
VCTRL
0.5V/DIV
VOUT
5V/DIV
500µs/DIV
DC2240A F04
Figure 4. Output Voltage Varies Between –5V and +5V, Following
an Externally Controlled 0.1V to 1V, 1kHz Sinusoidal Voltage Source
dc2240af
3
DEMO MANUAL DC2240A
Parts List
ITEM
QTY REFERENCE
Required Circuit Components
1
4
CIN1, CIN2, CIN3, CIN4
2
6
C1, C2, C3, C4, C20, C21
3
2
CO1, CO2
4
3
C7, C8, C9
5
1
C10
6
1
C11
7
1
C12
8
1
C13
9
1
C15
10
1
L1
11
1
L2
12
1
MN1
13
1
MP1
14
1
R1
15
1
R2
16
6
R3, R4, R5, R6, R9, R10
17
1
R7
18
1
R8
19
1
R16
20
1
R19
21
3
R12, R15, R18
22
1
R13
23
1
R14
24
1
R17
25
1
R19
26
1
R20
27
1
R22
28
1
U1
29
1
Additional Demo Board Circuit Components
1
0
CO3, CO4 (OPT)
2
0
C5, C6, C16, C17 (OPT)
3
0
C18 (OPT)
4
0
VR1 (OPT)
5
0
R21 (OPT)
6
0
MN2 (OPT)
7
0
MP2 (OPT)
Hardware: For Demo Board Only
1
13 E1-E13
2
3
4
5
4
1
1
2
4
JP1
JP2
XJP1, XJP2
MH1-MH4
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., X5R, 22µF, 25V, 10%, 1210
CAP., X5R, 22µF, 25V, 10%, 1210
CAP., X5R, 100µF, 10V, 20%, 1210
CAP., X7R, 2.2µF, 25V, 10%, 0805
CAP., X7R, 0.68µF, 25V, 10%, 0603
CAP., X7R, 0.068µF, 25V, 10%, 0603
CAP., X7R, 0.01µF, 25V, 10%, 0603
CAP., X7R, 100pF, 25V, 10%, 0603
CAP., X7R, 0.1µF, 16V, 10%, 0603
INDUCTOR, 15µH
INDUCTOR, 15µH
N-CH FET, PG-TDSON-8
P-CH FET, DPAK
RES., SENSE, 7 mΩ, 1%, RL3720W
RES., SENSE, 2 mΩ, 1%, RL3720W
RES., 0Ω, 0.1W, 1%, 0603
RES., 10k, 1/10W, 1%, 0603
RES., 57.6k, 1/10W, 1%, 0603
RES., 6.98k, 1/10W, 1%, 0603
RES., 18.7k, 1/10W, 1%, 0603
RES., 100k, 1/10W, 1%, 0603
RES., 73.2k, 1/10W, 1%, 0603
RES., 100, 1/10W, 1%, 0603
RES., 178k, 1/10W, 1%, 0603
RES., 18.7k, 1/10W, 1%, 0603
RES., 1Ω, 1/4W, 1%, 1206
RES., 1.78k, 1/10W, 1%, 0603
I.C., VOLTAGE REGULATOR, 20TSSOP
FAB, PRINTED CIRCUIT BOARD
MURATA, GRM32ER61E226KE15L
MURATA, GRM32ER61E226KE15L
MURATA, GRM32ER61A107ME20K
MURATA, GRM21BR71E225KA73L
TDK, C1608X7R1E684K080AB
MURATA, GRM188R71E683KA01D
MURATA, GRM188R71E103KA01D
AVX, 06033C101KAT2A
MURATA, GRM188R71C104KA01D
Coilcraft, XAL1510-153
Coilcraft, XAL1010-153
INFINEON, BSC034N06NS
FAIRCHILD, FDD4141
SUSUMU, RL3720WT-R007-F
SUSUMU, RL3720WT-R002-F
VISHAY, CRCW06030000Z0EA
VISHAY, CRCW060310K0FKEA
VISHAY, CRCW060357K6FKEA
VISHAY, CRCW06036K98FKEA
VISHAY, CRCW060318K7FKEA
VISHAY, CRCW0603100KFKEA
VISHAY, CRCW060373K2FKEA
VISHAY, CRCW0603100RFKEA
VISHAY, CRCW0603178KFKEA
VISHAY, CRCW060318K7FKEA
VISHAY, CRCW12061R00FKEA
VISHAY, CRCW06031K78FKEA
LINEAR TECHNOLOGY, LT8714EFE#PBF
DEMO CIRCUIT 2240A
CAP., OPTION, 1210
CAP., OPTION, 0603
CAP., OPTION, 0805
TRIMMER, OPT
RES., OPT, 0603
N-CH FET, OPTION, DPAK
P-CH FET, OPTION, PG-TDSON-8
TESTPOINT, TURRET, .094" PbF
MILL-MAX, 2501-2-00-80-00-00-07-0
HEADER 3 PIN 0.079 SINGLE ROW
HEADER 3 PIN 0.079 DOUBLE ROW
SHUNT, 0.079" CENTER
STAND-OFF, NYLON 0.50"
WURTH ELEKTRONIK, 620 003 111 21
WURTH ELEKTRONIK, 620 006 211 21
WURTH ELEKTRONIK, 608 002 134 21
KEYSTONE, 8833 (SNAP ON)
dc2240af
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
E12
E11
E10
E9
E4
E3
E2
IMON
SYNC
EN
VIN
CIN1
22µF
25V
1210
CIN2
22µF
25V
1210
CIN3
22µF
25V
1210
CIN4
22µF
25V
1210
E
1. ALL RESISTORS AND CAPACITORS 0603.
NOTE: UNLESS OTHERWISE SPECIFIED.
AGND
IMON
SYNC
EN
PGND
VIN
10V - 14V
E1
D
2.2µF
0805
C7
R17
178k
1%
2.2µF
0805
C8
10k
R7
R18
100k
IMON
SYNC
R12
100k
EN
C10
680nF
INTVCC
R8
57.6k
R6
0
NG
C11
68nF
5
3
19
18
4
12
16
13
11
4
BIAS
CTRL
FB
ISN
ISP
TG
GND
21
20
C
VC
INTVEE
GND
U1
LT8714EFE
15
C6
OPT
R5
0
CSP
IMON
SS
SYNC
RT
PG
R1
0.002
1%
RL3720W
NG
TG
0.007
RL3720W
R2
14
INTVCC
EN
VIN
BG
ISN
C
0
22uF
1210
25V
22uF
1210
25V
C2
C1
MP1
FDD4141
5
C9
2.2µF
0805
73.2k 1%
C12
10nF
R16
6.98k
R9
0
R10
0
VIN
C18
OPT
0805
C17
OPT
C3 22uF
C4
C20 1210
C21 25V
R13
C16
OPT
TG
PG
MN2
OPT
DPAK
C13
100pF
2
9
8
17
1
6
7
10
R3
PG
3
2
1
MP2
OPT
PG-TDSON-8
4
ISP
CSN
R4
0
OPT
C5
MN1
BSC034N06NS
L1
15uH
XAL1510-153
5
1
2
3
D
D
1
1206
R20
C15
100nF
ISN
ISP
L2
15uH
XAL1010-153
100
B
R14
B
OPT
VR1
3
R21
OPT
0603
1
2
JP1
+5V
4
6
5
JP2
2
3
-5V
OPT
R19
18.7k
0603
1
CO4
OPT
100k
0603
INT
2
EXT
CO3
OPT
R15
CO2
100µF
10V
1210
1
R22
1.78k
0603
INTVCC
CO1
100µF
10V
1210
3
E
A
VOUT
A
E13
PGND
VOUT
±5V / 5A
VCTRL
0.1V - 1V
E8
E7
E6
E5
A
B
C
D
DEMO MANUAL DC2240A
Schematic Diagram
dc2240af
5
DEMO MANUAL DC2240A
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
6
dc2240af
Linear Technology Corporation
LT 1015 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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●
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