DC471A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
LT3430
DESCRIPTION
Demonstration circuit 471 is a 60V, 200kHz, 2A
load current, monolithic step-down DC/DC
switching converter using the LT3430. With its
wide input voltage range, 3A internal power
switch, and thermally enhanced package,
the LT3430 is a very versatile and powerful IC
for DC/DC converters that require compact
space and a wide variety of input voltage
ranges. The constant 200kHz switching frequency allows all of the components to be
small, surface mount devices. The currentmode control topology creates fast transient
response and good loop stability with a minimum number of external compensation
components and the use of ceramic input
and output capacitors if desired. The low resistance internal power switch (0.1Ω) maintains
high efficiencies >80% and up to 90%. The
SHDN pin and 30µA shutdown current extend
battery life. The wide input range allows stepdown configurations with input voltages between 5.5V and 60V. Both steady state and
transient operation up to 60V is possible. Syn-
chronization of switching frequencies up to
700kHz is possible.
Demonstration Circuit 471 is a step-down
converter using the LT3430. The circuit is designed for 7.5V–60V input to 5.0V output at 2A
load current for automotive, industrial, portable computers, battery chargers, and distributed power systems. This board was designed for wide input voltage range applications where simplicity, small circuit size, and
low component count are important as well
as up to 2A of load current. The low-ESR tantalum output capacitor reduces output voltage ripple. Replacing this capacitor with a
ceramic capacitor not only demonstrates
small size and low cost, but the advantage of
current-mode control in step-down applications with a simple compensation network
and a feedforward capacitor for more rugged stability and excellent transient response.
Design files for this circuit board are available.
Call the LTC factory.
Table 1. Typical Performance Summary
PARAMETER
CONDITION
VALUE
Steady State Input Voltage Range
VOUT = 5V, IOUT ≤ 2A
7.5– 60V
Maximum Transient Input Voltage
All Vout (customized)
60V
VOUT
IOUT ≤ 2A
5V ±3%
Maximum Output Current
2A
Typical Switching Frequency
200kHz
Typical Efficiency
VIN = 12V, VOUT = 5V, IOUT = 2A
86%
Output Voltage Ripple
VIN = 12V, VOUT = 5V, IOUT = 2A
30mVP–P
QUICK START PROCEDURE
Demonstration circuit 471 is easy to set up to
evaluate the performance of the LT3430. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below:
NOTE: Make sure that the input voltage does
not exceed 60V.
1. Connect the 7.5V–60V input power supply
to the Vin and GND terminals on the board.
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
2. Connect an ammeter in series with the in-
6. Connect a voltmeter across the Vout and
3. Connect either power resistors or an elec-
7. After all connections are made, turn on in-
4. Connect an ammeter in series with output
8. The synchronization and shutdown func-
put supply to measure input current.
GND terminal to measure output voltage.
tronic load to the Vout and GND terminals
on the board.
put power and verify that the output voltage is 5.0V.
load to measure output current.
tions are optional and their pins can be left
floating (disconnected) if their functions are
not being used.
5. Connect a voltmeter across the Vin and
GND terminals to measure input voltage.
+
+
–
–
–
+
+
–
+
LOAD
–
+
–
–
OPTIONAL
+
Figure 1. Proper Measurement Equipment Setup
100
90
80
EFFICIENCY (%)
70
60
8VIN
50
12VIN
40
24VIN
30
48VIN
20
55VIN
10
0
0
400
800
1.2k
1.6k
2.0k
LOAD CURRENT (mA)
Figure 2. Efficiency vs Load Current
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
CUSTOMIZING THE BOARD
The components assembled on the board are
optimized for a wide input voltage range and
a 5V output. The bandwidth can be increased for more specific input voltages such
as 12V ±10% or 18V–24V with 36V transient if
desired (just a few examples). The adjustable
feedback resistors allow the output voltage to
be customized. For output voltages below 3V,
the boost diode should be moved from D2 to
D3 to provide the minimum boost voltage required for the internal power switch. Make
sure that the boost capacitor (C8) has a voltage rating greater than or equal to the output voltage for applications where the boost
diode is placed in D2. However, the boost
capacitor must have a voltage rating greater
than the input voltage whenever the boost
diode is placed in position D3.
D4 is an optional boost voltage blocking diode. For custom applications in which the
output voltage is significantly greater than 5V,
this blocking diode reduces the boost driver
voltage, reducing the power (and thus heat)
dissipation inside the IC. It is recommended
that a CMHZ5236B zener diode is used in D4
when VOUT = 12V and the junction temperature is hot without the use of the zener. Note
that in order to properly install D4, the small
trace connecting the anode and cathode of
D4 on the board must be separated (an Exacto knife works well) before D4 is soldered to
the board.
Vin
Vout
8V to 40V
D2
5V @2A
MMSD914
TDK 4.7uF Ceramic
C4
0.68uF
C5750X7R1H475K
C3
Boost
Sync
Vin
Sumida 22uH
L1
CEI-122 220
Sw
Vout
/Shdn
U1
LT3430EFE
R2
15.4k
Bias
Vc
C4532X5R0J107M
C5
C1
220pF
C2
22nF
Gnd
Fb
R1
3.3k
TDK 100uF
Ceramic
D1
30BQ060
R3
4.99k
IR
Figure 3. FireWire peripheral application:
8V–40V input, 5V output @2A with all ceramic capacitors and 3.0mm maximum component height.
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
10V to 14V nominal
40V transient
Vin
D2
Coptional
TAJC105K050
C3
4.7uF
MMSD914LT1
50V, X7R, 2220
C5750X7R1H475K
7
13
1
6
4
Vin
Boost
5
Sw
5V @2.0A
CDRH104R-220
Sumida
Vout
Coptional2
1.0uF
Sync
Ceramic
U1
LT3430EFE
nc
10
Bias
R2
15.4k
nc
Gnd
Gnd
C5
TPSD107M010R0100
AVX
12
Fb
9
8
/Shdn
Vout
L1
Vout
Vc
14
16V Taiyo Yuden
EMK212BJ684MG
2
Sw
Vc
11
15
Gnd
Sync
Gnd
/Shdn
Vin
3
C4
0.68uF
16
AVX TAJ
TDK ceramic
D1
R3
4.99k
C9
OPT
30BQ060
C2
22nF
Vc
C1
200pF
R5
OPT
R1
3.3k
R6
Q1
OPT
OPT
Optional Soft Start Circuitry on Back of Board
Figure 4. 10V–14V input with 40V input transient, 5V output @2A.
Vin
16V to 36V
48V non-operating transient
C3
4.7uF, 50V Ceramic
MMSD914T1
SMAZ6V8
11V @2.5A
6
Boost
U1
LT3430EFE
nc
Sw
5
CDRH104R-220
Bias
Copt2
1uF, 16V
10
R2
41.2k
nc
Gnd
C5 & C7
2x 100uF, 20V AVX TPS
Vc
Fb
Cff
100pF
12
11
Gnd
9
8
Sw
Sync
Gnd
1
Vout
L1
2
Vout
16
13
4
3
7
Vin
Vin
14
/Shdn
Gnd
15
300kHz
D4
C4
1uF, 16V
C5750X7R1H475K
Sync
D2
R3
4.99k
D1
30BQ060
R1
4.7k
C1
200pF
C2
10nF
Figure 5. 16V–36V input with 48V input transient, 11V output @2.5A, 300kHz external synchronization.
Note that 2.5A may experience thermal derating. See the data sheet.
4
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
5
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
6
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
APPROVED VENDOR LIST
VENDOR
AAC (was TAD)
AAC (was TAD)
AAVID
ALLEN BRADLEY
AMP
APEM
API DELEVAN
AVX
AVX
AVX
AVX
BERG
BH ELECTRONICS
BI TECHNOLOGIES
BI TECHNOLOGIES
BOURNS
CADDOCK ELECTRONICS
CENTRAL SEMI
CHICAGO MINIAT. LAMP
COILCRAFT
COMM CON
CONNEX
COOPER ELECT. TECH.
CORNELL DUBILIER
CTS
CUI-STACK
DALE (see Vishay)
DALE (see Vishay)
DATA DISPLAY PRODUCT
DIODES INC.
ELECTRONIC CONCEPTS
EPSON
FAIRCHILD
FAIRCHILD
FAIRCHILD
FCI
FUKUSHIMA
FUJI
GENERAL SEMICONDUCTOR
GOWANDA
GRAYHILL
HARRIS
HEWLETT PACKARD
HITACHI
PHONE NUMBER
(800) 508-1521
(714) 255-9186
(714) 556-2665
(800) 592-4888
(717) 564-0100
(718) 246-1007
(716) 652-3600
(843) 946-0362
(843) 946-0524
(207) 282-5111
(843) 946-0323
(800) 237-2374
(952) 894-9590
(714) 447-2656
(714) 447-2345
(801) 750-7253
(541) 496-0700
(631) 435-1110
(201) 489-8989
(847) 639-6400
(626) 301-4200
(805) 378-6464
(561) 752-5000
(508) 996-8561
(219) 293-7511
(503) 643-4899
(605) 665-1627
(605) 665-9301
(800) 421-6815
(805) 446-4800
(908) 542-7880
(310) 787-6300
(207) 775-4502
(408) 822-2126
(888) 522-5372
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(818) 765-8300
(201) 712-0555
(516) 847-3000
(716) 532-2234
(708) 354-1040
(800) 442-7747
(800) 235-0312
(408) 433-1990
PART TYPE
WEBSITE ADDRESS
CHIP RESISTORS
HEAT SINKS
CARBON RESISTORS
PC MOUNT BNC
SMD TOGGLE/PB SWITCH
INDUCTORS
CHIP CAPS
CHIP RESISTORS
TANTALUM CAPS
HIGH VOLTAGE CAPS
CONNECTORS
INDUCTORS
TRANSFORMERS
RES./RES. NETWORKS
POTENTIOMETERS, SIPS
HIPO. RES., SIPS, DIPS
SMALL SIGNAL DISCRETES
LEDS
INDUCTORS
HEADERS, SHUNTS
BNC CONNECTORS
INDUCTORS
CAPACITORS
RESISTOR ARRAYS
POWER CONNECTORS
INDUCTORS
SENSE RESISTORS
LEDS
DIODES
400V FILM CAPACITORS
CRYSTALS
LOGIC
MOSFETS
CRG (CUST. RESPONSE)
HOT PLUG CONNECTORS
MPC RESISTORS
SCHOTTKY DIODES
DIODES
INDUCTORS
DIP SWITCHES
LOGIC
IR LED
RF POWER AMPS
7
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
IDT
IR
IRC
ITW PAKTRON
JOHNSON COMPONENTS
JOHNSON COMPONENTS
KEMET
KEMET
KETEMA
KEYSTONE
LITEON
LTC
MAGNETICS
MARCON
METHODE
MF ELECTRONICS
MICROCHIP
MICRO PLASTICS
MICRO-SEMI
MIDCOM
MIDCOM
MILL-MAX
MINICIRCUITS
MOTOROLA
MURATA ELECTRONICS
MURATA ELECTRONICS
MURATA ELECTRONICS
NEC/TOKIN
NICHIA
NICHICON
ON SEMICONDUCTOR
ON SHORE
PANASONIC
PANASONIC
PANASONIC
PERICOM
PHILIPS
PHILIPS
PHILIPS
PULSE
QT OPTOELECTRONICS
RAYCHEM
RG ALLEN
RF MICRO DEVICES
SAMTEC
SANYO
SCHOTT
(408) 727-6116
(310) 322-3331
(361) 992-7900
(708) 667-3444
(650) 948-6533
(760) 434-5961
(408) 986-0424
(864) 963-6300
(714) 630-0081
(718) 956-8900
(408) 241-4588
(408) 432-1900
(800) 245-3984
(847) 696-2000
(800) 323-6864
(914) 576-6570
(602) 786-7200
(870) 453-8861
(617) 926-0404
(605) 886-4385
(800) 643-2661
(516) 922-6000
(718) 934-4500
(800) 441-2447
(770) 436-1300
(800) 831-9172
(770) 433-5789
(510) 324-4110
(408) 573-0933
(847) 843-7500
(602) 244-6600
(602) 921-3000
(714) 373-7334
(201) 348-5217
(201) 373-7334
(408) 435-0800
(914) 246-2811
(914) 247-2036
(508) 851-2200
(619) 674-8100
(408) 720-1440
(800) 227-4856
(818) 765-8300
(336) 664-1233
(800) 726-8329
(619) 661-6835
(507) 532-3201
LOGIC IC
MOSFETS
SENSE RESISTORS
CAPACITORS
RF CONNECTORS
RF CONNECTORS
TANTALUM CAPS
CRG (CUST. RESPONSE)
SURGE SUPPRESSORS
JACKS, TURRETS
LEDS, DIODES
HIGH PERF. I.C.S
TOROID CORES ETC.
HIGH C/V CAPACITORS
ZIF SOCKETS
CRYSTAL OSCILLATORS
MICROCONTROLLER IC
NYLON STANDOFFS
DIODES
INDUCTORS
INDUCTORS
TURRETS
RF TRANSFORMERS
LOGIC, REGS
CAPS., INDUCTORS,
CRG (CUST. RESPONSE)
RF DEVICES
INDUCTORS/HI C/V CAPS
WHITE LEDS
ELECTROLYTIC CAPACITOR
DISCRETE DIODES ETC.
TERMINATORS
INDUCTORS, POLY CAPS
LEDS
SWITCHES
LOGIC IC
INDUCTORS
PLANAR INDUCTORS
DISCRETES, I.C.s
INDUCTORS
RF SWITCH
FUSES
METAL OXIDE RESISTORS
RF2138 / RF2140
WIRE JUMPERS
OSCON CAPS
INDUCTORS, XFORMERS
8
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
SCHURTER
SIGNATRON
SIEMENS
SILICONIX
SILICONIX
SPRAGUE
SULLINS
SUMIDA
SUMIDA
TAIYO YUDEN
TAIYO YUDEN
TEKTRONIX
TEMIC
THERMALLOY
THIN FILM TECHNOLOGY
TOCOS
TOKIN (NEC)
TOKO
TOSHIBA
TOSHIBA
UNITED CHEMICON
VISHAY
VISHAY
VITRAMON
WIMA
ZETEX
ZIERICK
(707) 778-6311
(909) 464-1883
(108) 257-7910
(800) 554-5565
(408) 988-8000
(207) 324-4140
(760) 744-0125
(847) 956-0667
(408) 982-9660
(408) 573-4150
(800) 348-2496
(800) 835-9433
(408) 970-5700
(972) 243-4321
(507) 625-8445
(847) 884-6664
(510) 324-4110
(847) 699-3430
(714) 455-2000
(949) 455-2000
(847) 696-2000
(605) 665-9301
(605) 665-9301
(203) 268-6261
(914) 347-2474
(631) 366-5068
(800) 882-8020
FUSES AND HOLDERS
DB9 CONNECTORS
OPTO
MOSFETS
MOSFETS
CAPACITORS
HEADERS, SHUNTS
INDUCTORS
INDUCTORS
CHIP CAPS / RES.
CRG (CUST. RESPONSE)
SCOPE PROBE SOCKETS
IR PHOTO DIODE
HEAT SINKS
THIN FILM CHIP RESISTORS
SMD POTENTIOMETERS
CAPS., INDUCTORS,
RF PRODUCTS
SINGLE GATE LOGIC
LOGIC
ELECTROLYTIC CAPACITOR
ZENER/SM. SIGNAL DIODES
INDUCTORS, SENSE Rs
CERAMIC CHIP CAPACITOR
PAPER/FILM CAPACITORS
SMALL SIGNAL DISCRETES
STAKED PINS
9
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
10
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 471
2A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
11
VIN
7.5V-60V
E1
D3
MMSD914T1
2
1
VIN
+ C7
OPT
E2
GND
SHDN
E3
SYNC
3
3
15
SYNC
14
4
1
BOOST
SHDN
SW
SYNC
SW
U1
BIAS
LT3430EFE
NC
NC
GND
8
GND
FB
GND GND
9
D2
MMSD914T1
1
2
D4
SMAZ7V5
2
1
SOD123
OPT
C4
0.68uF
16V
6
VIN VIN
7
13
C
BOOST
OPT
C3
4.7uF
100V
SHDN
E4
2
2
1
D
L1
33uH
1
SW
E5
VOUT
2
UP3B-330
1
D
4
5
C9
OPT
D1
30BQ060
SMC
10
R2
15.4k
1%
12 FB
R4
OPT
VOUT
[email protected]
C6
OPT
0805
C5
2
5
+ 100uF
C
10V
7343
C8
OPT
E6
GND
VC
16
11
VC
3
C1
220pF
C2
0.022uF
R6
OPT
1
2
R1
3.3k
R3
4.99k
1%
Q1
MMBT2222A
OPT
R5
OPT
B
B
NOTE: UNLESS OTHERWISE SPECIFIED
A
CONTRACT NO.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
2. FOR ALL OPTIONAL COMPONENTS ON BOARDS:
Q1, R5, R6, C9: SHOW OUTLINE AND REFERENCE DESIGNATORS.
D3, D4: NO OUTLINE, SHOW REFERENCE DESIGNATORS.
C6, C7, C8, R4: NO OUTLINE, NO REFERENCE DESIGNATORS.
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER: KEITH S.
DESIGNER:
TECHNOLOGY
KIM T.
TITLE: SCHEMATIC
4
3
A
2A, 200KHz HIGH VOLTAGE BUCK CONVERTER
SIZE
DWG NO.
A
DATE:
5
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Wednesday, July 10, 2002
2
REV
DC471A-1 * LT3430EFE
SHEET 1
1
A
OF
1
BILL OF MATERIALS
DC471A-1
Linear Technology Corporation
LT3430EFE
6/17/2005
12:07 PM
2A, 200KHz HIGH VOLTAGE BUCK CONVERTER
ENG: KEITH S.
Item Qty Reference
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
1
1
1
0
1
0
0
0
1
1
0
0
6
1
0
0
1
1
1
0
1
4
4
Part Description
C1
C2
C3
C4
CAP, NPO 220pF 25V 10%
CAP, X7R 0.022uF 16V 10%
CAP, Y5V 4.7uF 100V, 80%, C-THCR60
CAP, X7R 0.68uF 16V 20%
OR
CAP, X5R 1.0uF 16V 10%, 0805
C5
CAP, TANT. 100uF 10V 20%, 7343
C6
CAP, 0805
C7
CAP, C SIZE, 6032
C8,C9
CAP, 0603
D1
DIODE SCHOTTKY,3A, 60V,SMA-DIODE
D2
DIODE, 200mA, 100V, SOD123
D3
DIODE, 200mA, 100V, SOD123
D4
DIODE ZENER, SMA-DIODE
E1-E6
TP, TURRET, .094"
L1
IND, SMT, 33uH, L-COIL-UP3B
OR
IND, SMT, 47uH, L-COIL-UP4B
Q1
TRANS, MMBT2222A, SOT23
R1
RES, 3.3k 5%, 0603
R2
RES, 15.4k 1%, 0603
R3
RES, 4.99k 1%, 0603
R4,R5,R6
RES, 0603
U1
IC, LT3430EFE, TSSOPFE16
MTG HOLES AT 4 CORNERS STANDOFF, NYLON HEX #4-40 x 1/4"
SCREW, #4-40 x 1/4
Manufacture / Part #
AVX, 06033A221KAT1A
AVX, 0603YC223KAT1A
UNITED CHEMI-CON, THCR60E2A475ZT
TAIYO YUDEN, EMK212BJ684MG
TAIYO YUDEN, EMK212BJ105ZG
AVX, TPSD107M010R0100
OPT
OPT
OPT
IR, 30BQ060
ON SEMI., MMSD914T1
ON SEMI., MMSD914T1
(OPT)
DIODES INC., SMAZ7V5
(OPT)
MILL-MAX, 2501-2
COILTRONICS, UP3B-330
COILTRONICS, UP4B-470
DIODES INC., MMBT2222A-7
(OPT)
AAC, CR16-332JM
AAC, CR16-1542FM
AAC, CR16-4991FM
OPT
LINEAR TECH., LT3430EFE
MICRO PLASTICS, #14HTSP101
ANY
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS.
2. INSTALL 4 STANDOFFS AT 4 CORNERS OF BOARD AND ON THE BOTTOM SIDE.
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