DC1523A - Demo Manual

DEMO MANUAL DC1523A
LTC3789EGN:
High Efficiency Synchronous
4-Switch Step-Up/Step-Down
DC/DC Converter
DESCRIPTION
Demonstration circuit 1523A features the LTC®3789EGN,
a high efficiency switching step-up/down controller. The
DC1523A input range is from 5V to 36V. The output voltage is 12V. The board is capable of delivering up to 5A of
output current over the input voltage range.
The LTC3789EGN is a high performance switching regulator controller designed to regulate the output using input
voltages above, below or equal to the output voltage.
Synchronous operation provides very high efficiency, up
to 97%. Constant frequency current mode architecture
allows phase-lockable frequency from 200kHz to 600kHz.
An accurate output current limit provides support for
battery charging. A wide input and output range with
smooth transfer function through all operating modes
makes the product ideal for automotive, telecom and
battery systems.
The MODE/PLLIN pin can select between pulse skipping
mode and forced continuous mode operation and allows
the IC to be synchronized to an external clock. A Power
Good output pin indicates when the output is within 7.5%
of its set point.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER
CONDITIONS/ NOTES
VALUE
Minimum Input Voltage
5V
Maximum Input Voltage
36V
Output Voltage VOUT Regulation
VIN = 5V to 36V, IOUT = 0A to 5A
12V ±2%
Maximum Continuous Output Current
Some Airflow May be Needed at Low Input
Voltage and Continuous Full Load
5A DC
Default Operating Frequency
R3 = 121k
External Clock Synchronous Frequency Range
Efficiency
Load Transient
400kHz
200kHz to 600kHz
VIN = 5V to 36V, IOUT = 5A
88% to 97%. See Figures 3 and 6
See Figure 5
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1
DEMO MANUAL DC1523A
QUICK START PROCEDURE
Demonstration circuit 1523A is easy to set up to evaluate the performance of the LTC3789EGN. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below.
4. Turn on the power at the input. Increase VIN to between
5V and 36V. The circuit will start and the output voltage
will regulate at 12V ±2%. The current draw at no load
is 20mA to 60mA depending on the input voltage.
1. With power off, connect the input supply, load and
meters as shown in Figure 1. Preset the load to 0A and
VIN supply to 0V.
5. Apply load and observe output voltage regulation, ripple
voltage, efficiency and other parameters. Efficiency and
power loss at full load is shown in Figure 3. Continuous
operation with full power and low input voltage may
require some airflow.
2. Set the current limit of the input supply high enough
so that the bench supply does not go into current limit
mode. Figure 2 shows input current as a function of
input voltage, at full load. Input current can reach 13A
at 5V input voltage.
3. Place jumpers in the following positions:
JP1
JP2
RUN
MODE
ON
CCM
+
POWER
SUPPLY
A
A
V
V
–
+
LOAD
–
DC1523A F01
Figure 1. Proper Measurement Equipment Setup
dc1523af
2
DEMO MANUAL DC1523A
QUICK START PROCEDURE
14
100
8
12
98
7
96
EFFICIENCY (%)
CURRENT (A)
8
IIN
6
IOUT
4
2
0
5
10
15
25
20
VIN (V)
35
30
94
5
92
4
90
3
POWER LOSS
88
2
86
1
84
40
6
EFFICIENCY
0
5
10
15
20
25
30
35
40
POWER LOSS (W)
10
0
VIN (V)
DC1523A F03
DC1523A F02
Figure 2. Input Current at Full Load (12V at 5A Out)
Figure 3. Efficiency and Power Loss at Full Load. The Power
Loss is Highest in Boost Mode Due to the High Inductor Current,
and Drops as Input Voltage Increases. Switching Losses Again
Increase when VIN > VOUT. All Four MOSFETs are Switching in
Buck-Boost Mode and This Shows Up as a Small Increase in
Losses When VIN = 11V to 15.5V
Figure 4. Output Ripple Voltage at 24VIN (Top), 12VIN (Middle),
6VIN (Bottom). Measured Across COUT1, BW = 20MHz, 100mV/Div
98
Figure 5. Load Transient Response
96
94
12
10
92
88
24V
30V
36V
6V
9V
12V
18V
90
0
1
3
2
LOAD (A)
VOUT (V)
EFFICIENCY (%)
14
4
5
8
6
4
2
DC1523 F06
Figure 6. Efficiency at Various Input Voltages
0
0
1
2
4
3
LOAD (A)
5
6
DC1523A F07
Figure 7. Output Current Limit. (VIN = 12V. The Easiest Way to Do
This Test is with an Active Load in Voltage Mode)
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3
DEMO MANUAL DC1523A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
AVX, 06035A102KAT2A
Required Circuit Components
1
1
CC1
CAP., C0G, 1000pF, 50V, 10% 0603
2
2
CC2, CSS
CAP., X7R, 0.01μF, 50V, 10% 0603
AVX, 06035C103KAT2A
3
1
CIN1
CAP., Alum, 270μF, 50V, 20%
SANYO, 50ME270WX+T
4
1
COUT1
CAP., OS-CON, 330μF, 16V, 20%
SANYO, 16SEP330M+T
5
4
C1, C2, C16, C17
CAP., X7R, 22μF, 16V, 20% 1210
AVX, 1210YC226MAT2A
6
2
C4, C22
CAP., X7R, 0.22μF, 16V, 20% 0603
TAIYO YUDEN, EMK107BJ224MA
7
4
C5, C6, C9, C25
CAP., X7R, 3.3μF, 50V, 20% 1210
AVX, 12105C335MAT2A
8
1
C10
CAP., X7R, 2.2μF, 10V, 10% 0603
MURATA, GRM188R71A225K
9
1
C12
CAP., NPO, 390pF, 100V, 10% 1206
AVX, 12061A391KAT2A
10
1
C13
CAP., NPO, 1800pF, 100V, 10% 1206
AVX, 12061A182KAT2A
11
1
C14
CAP., X7R, 0.1μF, 50V, 10% 0603
AVX, 06035C104KAT2A
12
1
C15
CAP., X7R, 1μF, 50V, 20% 1206-1210
AVX, 12065C105MAT2A
13
1
C18
CAP., X7R, 10μF, 10V, 20% 1206
AVX, 1206ZC106MAT2A
14
1
C24
CAP., X7R, 1μF, 16V, 20% 0603
AVX, 0603YC105MAT2A
15
1
D2
DIODE, BAS16, SOT23
DIODES, BAS16
16
2
D7, D4
SCHOTTKY REC., DFLS160, PowerDI-123
DIODES INC., DFLS160
17
2
D5, D6
SCHOTTKY RECT., B240A SMA
DIODES INC. B240A-13-F
18
1
D8
ZENER DIODE, 5.1V, BZX84C5V1, SOT23
DIODES INC. BZX84C5V1-7-F
19
1
L1
INDUCTOR, 4.7μH
TOKO, FDA1254-4R7M
20
1
Q2
MOSFET N-CHAN., 40V
VISHAY, Si7884BDP-T1-E3
21
1
Q4
MOSFET N-CHAN., 40V
VISHAY, Si4840BDY-T1-E3
22
2
Q3, Q5
MOSFET N-CHAN., SiR496DP, 20V
VISHAY, SiR496DP-T1-GE3
23
1
RC
RES., CHIP., 14.7k, 0.1W, 1% 0603
VISHAY, CRCW060314K7FKEA
24
1
RFB1
RES., CHIP., 113k, 0.1W, 1% 0603
VISHAY, CRCW0603113KFKEA
25
1
RFB2
RES., CHIP., 8.06k, 0.1W, 1% 0603
VISHAY, CRCW06038K06FKEA
26
1
R1
RES., CHIP., 5.6Ω, 0.1W, 1% 0603
VISHAY, CRCW06035R60FKEA
27
2
R2, R18
Sensor Res., 0.01Ω, 1W, 2%, RL3720W
Thin Film Tech., RL3720WT-R010-G-C
28
4
R3, R4, R13, R14
RES., CHIP., 100Ω, 0.1W, 5%, 0603
VISHAY, CRCW0603100RJNEA
29
1
R5
RES., CHIP., 15Ω, 0.125W, 1% 0603
VISHAY, CRCW060315R0FKEA
30
1
R7
RES., CHIP., 100k, 0.1W, 1% 0603
VISHAY, CRCW0603100KFKEA
31
3
R8, R11, R26
RES., CHIP., 10Ω, 0.1W, 5% 0603
VISHAY, CRCW060310R0JNEA
32
2
R10, R9
RES., CHIP., 1.24k, 0.1W, 1% 0603
VISHAY, CRCW06031K24FKEA
33
1
R20
Sensor Res., 0.004Ω, 1W, 2%, RL3720W
Thin Film Tech., RL3720WT-R004-G-C
34
1
R21
RES., CHIP., 121k, 0.1W, 1% 0603
VISHAY, CRCW0603121K0FKEA
35
1
R24
RES., CHIP., 10k, 0.1W, 1% 0603
VISHAY, CRCW060310K0FKEA
36
1
R25
RES., CHIP., 0Ω, 0.125W, 0805
VISHAY, CRCW08050000Z0EA
37
1
R28
RES., CHIP., 5.6Ω, 1% 1206
VISHAY, CRCW12065R60FNEA
38
1
R29
RES., CHIP., 3.6Ω, 1% 1206
VISHAY, CRCW12063R60FNEA
39
1
R30
RES., CHIP., 33.2k, 0.1W, 1% 0603
VISHAY, CRCW060333K2FKEA
40
1
R31
RES., CHIP., 12.1k, 0.1W, 1% 0603
VISHAY, CRCW060312K1FKEA
41
1
U1
I.C.,VOLT. REG.
Linear Tech. Corp.LTC3789EGN
dc1523af
4
DEMO MANUAL DC1523A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
42
0
C3, C23, C26, C27 OPT
CAP., 1210
43
1
CIN2
CAP., Alum, OPT
44
0
CF1, C11, CF, C7, C8 OPT
CAP., 0603
45
0
COUT2 OPT
46
0
Q6 OPT
47
0
Q7 OPT
Dual N-CHAN., Si7958DP, 40V
48
0
R6, R12, R22, R27 OPT
RES., OPT
Dual N-CHAN., Si7948DP, 60V
Hardware for Demo Board Only
49
4
TP1, TP2, TP3, TP7
TESTPOINT, TURRET, 0.061" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
50
7
TP4-TP6, TP8, TP10-TP12
TESTPOINT, TURRET, 0.094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
51
1
JP1
3-PIN 0.079 SINGLE ROW HEADER
SAMTEC, TMM103-02-L-S
52
2
JP2C, JP2B
2-PIN 0.079 SINGLE ROW HEADER
SAMTEC, TMM102-02-L-S
53
2
XJP1, XJP2B
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
54
4
J1, J2, J3, J4
CONNECTOR, BANANA JACK
KEYSTONE, 575-4
55
4
(STAND-OFF)
STAND-OFF, NYLON 0.25"
KEYSTONE, 8831(SNAP ON)
dc1523af
5
6
A
B
C
D
OFF
EXTVCC
PLLIN
TP4
TP6
TP8
R27
OPT
TP12
TP10
3
MODE
JP2C
CCM
JP2B
PULSE
SKIP
R25
0
R22
OPT
INTVCC
CF
OPT
5
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
R24
10K
RFB1
113K
VOS+
INTVCC
D8
BZX84C5V1
OPT
8.06K
CF1
RFB2
R7
100K
INTVCC
R31
12.1K
33.2K
JP1 VIN+
RUN
1
R30
2
TP5
CSS
0.01uF
TP11
ON
SS
SGND
PGOOD
VLOGIC
INTVCC
5
VIN
R14
VOUT 100
C8 OPT
C7 OPT
0.01uF
C11
OPT
100
R13
4
14
13
12
11
10
9
8
7
6
5
<------
IOSENSE-
IOSENSE+
ILIM
VOUTSNS
VINSNS
RUN
FREQ
MODE/PLLIN
SGND
ITH
SENSE1-
SENSE1+
SS
VFB
R3 100
15
16
17
18
19
20
21
22
23
24
25
26
27
28
D4
10
C18
3
R12 OPT
Q4
5.6
D2
BAS16
1
R1
3
Si4840BDY
R6 OPT
C22
0.22uF
16V
Q2
BG1
Si7884BDP
10uF
1206
DFLS160
D7
VIN
SW1
TG1
R5
15 Ohm
0805
C4
0.22uF
16V
R26 VOUT
10
C24 1uF
INTVCC
3
C15
1uF
50V
1210
DFLS160
R11
R4 100
CIRCUITRY ON
THIS SIDE MUST
CONNECT TO
POWER GND
GROUNDPLANE
------>
NC
SW2
TG2
BOOST2
BG2
EXTVCC
INTVCC
VIN
BG1
PGND1
BOOST1
TG1
SW1
PGOOD
U1
LTC3789EGN
CIRCUITRY ON
THIS SIDE MUST
CONNECT TO
SIGNAL GND
GROUNDPLANE
C10
2.2uF
121K 1%
R21
14.7K
RC
4
3
2
1
C14
0.1uF
INTVCC
CC1 1000pF
1.24K
R10
CC2
1.24K
R9
4
1210
16V
22uF
SW2
TG2
BG2
R29
3.6
1206
C13
1800pF
1206
CUSTOMER NOTICE
CS
Q5
SiR496DP
4.7uH
L1
D6
B240A
VOUT1
C9
3.3uF
50V
1210
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
0.004
R20
SCALE = NONE
TAGE B.
AK
APPROVALS
C1
C2
C16
C17
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
R18
0.010
2%
B240A
D5
C12
390pF
1206
Q3
C26
OPT
1210
SiR496DP
C27
OPT
1210
5.6 Ohm
1206
R28
C25
3.3uF
50V
1210
2
J1
DATE
GND
VOS-
VOS+
12V @ 5A MAX
VOUT
GND
GND
VIN+
5V - 36V
VIN
07-02-10
DATE:
1
LTC3789EGN
DEMO CIRCUIT 1523A
Friday, November 19, 2010
IC NO.
SHEET 1
OF 2
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
J2
TP1
TP2
VOS+
R8
10
J4
TP7
TP3
J3
TAGE B.
APPROVED
HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER
N/A
SIZE
+
COUT1 COUT2
330uF 330uF
16V
16V
OPT
+
+
CIN2
OPT
TECHNOLOGY
1210
OPT
C23
VOUT
CIN1
270uF
50V
+
1
DESCRIPTION
REVISION HISTORY
PRODUCTION
VIN+
C3
C6
3.3uF
50V
1210
3
REV
TITLE: SCHEMATIC
0.010
2%
R2
C5
3.3uF
50V
1210
__
ECO
A
B
C
D
DEMO MANUAL DC1523A
SCHEMATIC DIAGRAMS
dc1523af
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
D
5
5
4
CS
BG1
SW1
TG1
4
CS
BG1 2
SW1
TG1 4
3
1
78
TG2 2
BG2
BG2 4
SW2
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
CUSTOMER NOTICE
Q7A
Si7958DP
SW2
TG2
1
Q6B
Si7948DP
SCALE = NONE
AK
TAGE B.
PCB DES.
APP ENG.
APPROVALS
3
56
Q6A
Si7948DP
78
56
Q7B
Si7958DP
VOUT1
VIN
OPTIONAL CIRCUIT #1
(1.5A OUTPUT)
3
2
2
TECHNOLOGY
DATE:
LTC3789EGN
1
DEMO CIRCUIT 1523A
Thursday, June 17, 2010
IC NO.
SHEET 2
HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER
N/A
SIZE
TITLE: SCHEMATIC
OF 2
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
1
A
B
C
D
DEMO MANUAL DC1523A
SCHEMATIC DIAGRAMS
dc1523af
7
DEMO MANUAL DC1523A
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
dc1523af
8
Linear Technology Corporation
LT 1210 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2010
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