DC2324A - Demo Manual

DEMO MANUAL DC2324A
LT3753
Active Clamp Forward Converter
with Synchronous Rectification
Description
Demonstration circuits 2324A-A, 2324A-B, and 2324A-C
are active clamp forward converters with synchronous
rectification featuring the LT®3753.
The DC2324A circuits feature soft-start which prevents
output voltage overshoot during startup or when recovering from an overload condition.
These circuits were designed to demonstrate the high level
of performance, efficiency and small solution size attainable
using this part. They operate at 240kHz. The DC2324A-A
produces a 24V/5A output from an input voltage range of
36V to 72V. The DC2324A-B produces a 24V/5A output
from an input voltage range of 18V to 36V. The DC2324A-C
produces a 24V/4A output from an input voltage range of
9V to 18V, making it suitable for telecom, industrial and
other isolated power supply applications. They all have
an eighth-brick footprint area. Synchronous rectification
helps to attain efficiency exceeding 94% (exceeding 95%
for the DC2324A-A and DC2324A-B).
The DC2324A also has a precise overcurrent protection
circuit that allows for continuous operation and low power
dissipation during short circuit conditions which ensures
high reliability.
Please refer to the LT3753 data sheet for design details
and applications information.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2324A
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 DC2324A-A
SYMBOL
PARAMETER
VIN
Input Supply Range
Specifications are at TA = 25°C
CONDITIONS
MIN
TYP
36
VOUT
Output Voltage
IOUT
Maximum Output Current, Continuous
21.6
fSW
Switching (Clock) Frequency
VOUT P-P
Output Ripple
VIN = 48V, IOUT = 5A (20MHz BW)
POUT/PIN
Efficiency (see Figure 2)
VIN = 48V, IOUT = 5A
24
MAX
72
V
26.4
V
5
Performance Summary DC2324A-B
UNITS
A
240
kHz
40
mVP–P
95.6
%
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Maximum Output Current, Continuous
fSW
Switching (Clock) Frequency
VOUT P-P
Output Ripple
VIN = 48V, IOUT = 5A (20MHz BW)
POUT/PIN
Efficiency (see Figure 3)
VIN = 48V, IOUT = 5A
MIN
TYP
MAX
36
V
24
26.4
V
18
21.6
5
UNITS
A
240
kHz
30
mVP–P
95.7
%
dc2324af
1
DEMO MANUAL DC2324A
Performance Summary DC2324A-C
SYMBOL
PARAMETER
VIN
Input Supply Range
Specifications are at TA = 25°C
CONDITIONS
MIN
TYP
9
VOUT
Output Voltage
IOUT
Maximum Output Current, Continuous
21.6
fSW
Switching (Clock) Frequency
VOUT P-P
Output Ripple
VIN = 48V, IOUT = 5A (20MHz BW)
POUT/PIN
Efficiency (see Figure 4)
VIN = 48V, IOUT = 5A
24
4
MAX
UNITS
18
V
26.4
V
A
240
kHz
30
mVP–P
94.8
%
Quick Start Procedure
Demonstration circuit 2324A is easy to set up to evaluate the performance of the LT3753. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
5. Once the proper output voltage is established, connect
a variable load capable of sinking 5A at 24V to the
output terminals +VOUT and –VOUT. Set the current
for 0A.
1. Set an input power supply that is capable of covering the input voltage range of the DC2324A (see the
Performance Summary table) to one of these voltages:
a. If efficiency measurements are desired, an ammeter
that is capable of handling 5ADC can be put in series
with the output load in order to measure the DC2324A’s
output current.
48V for the DC2324A-A,
12V for the DC2324A-C.
b. A voltmeter can be placed across the output terminals
in order to get an accurate output voltage measurement.
6. Turn on the power at the input.
24V for the DC2324A-B,
Then turn off the supply.
2. With power off, connect the supply to the input terminals +VIN and –VIN. If efficiency measurements are
desired, an ammeter with proper rating can be put in
series with the input supply in order to measure the
DC2324A’s input current.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed
100V.
4. Check for the proper output voltage of 24V. Turn off
the power at the input.
2
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 voltage is again established,
adjust the load within the operating range and observe
the output voltage regulation, ripple voltage, efficiency
and other desired 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 –VIN, or +VOUT and –VOUT terminals.
dc2324af
DEMO MANUAL DC2324A
Quick Start Procedure
+
VIN
–
–
+
–
IIN
+
VIN
LOAD
+ –
IOUT
+
VOUT
–
+
–
DC2324 F01
100
100
95
95
95
90
85
80
75
1
2
3
LOAD CURRENT (A)
4
5
DC2324 F02
Figure 2. DC2324A-A Efficiency
90
85
80
VIN = 36V
VIN = 48V
VIN = 72V
0
EFFICIENCY (%)
100
EFFICIENCY (%)
EFFICIENCY (%)
Figure 1. Proper Measurement Equipment Setup
75
1
2
3
LOAD CURRENT (A)
4
5
DC2324 F03
Figure 3. DC2324A-B Efficiency
85
80
VIN = 18V
VIN = 24V
VIN = 36V
0
90
75
VIN = 9V
VIN = 12V
VIN = 18V
0
1
2
3
LOAD CURRENT (A)
4
5
DC2324 F04
Figure 4. DC2324A-C Efficiency
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3
DEMO MANUAL DC2324A
Quick Start Procedure
20mV/DIV
2µs/DIV
DC2324 F05
Figure 5. DC2324A-A Output Ripple at 48VIN and 5AOUT (20MHz BW)
20mV/DIV
2µs/DIV
DC2324 F06
Figure 6. DC2324A-B Output Ripple at 24VIN and 5AOUT (20MHz BW)
20mV/DIV
2µs/DIV
DC2324 F07
Figure 7. DC2324A-C Output Ripple at 12VIN and 4AOUT (20MHz BW)
4
dc2324af
DEMO MANUAL DC2324A
Quick Start Procedure
Figure 8. DC2324A-A Thermal Map, Front Side at 48VIN and 5AOUT (TA = 25°C)
Figure 9. DC2324A-A Thermal Map, Back Side at 48VIN and 5AOUT (TA = 25°C)
Figure 10. DC2324A-B Thermal Map, Front Side at 24VIN and 5AOUT (TA = 25°C)
dc2324af
5
DEMO MANUAL DC2324A
Quick Start Procedure
Figure 11. DC2324A-B Thermal Map, Back Side at 24VIN and 5AOUT (TA = 25°C)
Figure 12. DC2324A-C Thermal Map, Front Side at 12VIN and 4AOUT (TA = 25°C)
Figure 13. DC2324A-C Thermal Map, Back Side at 12VIN and 4AOUT (TA = 25°C)
6
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DEMO MANUAL DC2324A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components for DC2324A-A, DC2324A-B, and DC2324A-C
1
1
CO1
CAP., X7R, 10µF, 50V, 10% 1210
MURATA, GRM32ER71H106KA12L
2
1
CSYS
CAP., ALUM., 270µF, 35V, G size
PANASONIC, EEHZA1V271P
3
1
CY1
CAP., X7R, 2200pF, 250V, 10% 2220
MURATA, GA355QR7GF222KW01L
4
3
C1, C3, C5
CAP., X7R, 0.1µF, 50V, 10% 0603
MURATA, GRM188R71H104KA93D
5
1
C2
CAP., X7R, 4.7µF, 25V, 10% 0805
MURATA, GRM21BR71E475KA73L
6
1
C4
CAP., X7S, 1µF, 100V, 10% 0805
MURATA, GRJ21BC72A105KE11L
7
1
C7
CAP., X7R, 2.2nF, 250V, 10% 0805
MURATA, GRM21AR72E222KW01D
8
1
C9
CAP., C0G, 680pF, 50V, 5% 0603
WURTH ELEKTRONIK, 885012006062
9
1
D1
DIODE, CMMR1U-02 SOD-123F
CENTRAL SEMI., CMMR1U-02
10
2
D2, D3
DIODE, BAV21W, SOD-123
MICRO COMMERCIAL CO., BAV21W-TP
11
1
D4
DIODE, BAT54A, SOT23
DIODES., BAT54A-7-F
12
1
D5
DIODE, HIGH-SPEED DIODE, SOD-523
NXP/PHILLIPS SEMI., BAS516
13
1
L1
INDUCTOR, 39µH,
CHAMPS, HRPQA2050-39
14
2
Q3, Q4
N-MOSFET, POWER 56
FAIRCHILD, FDMS86200DC
15
1
R1
RES., CHIP, 31.6k, 0.1W, 1% 0603
VISHAY, CRCW060331K6FKEA
16
1
R2
RES., CHIP, 100k, 0.1W, 1% 0603
VISHAY, CRCW0603100KFKEA
17
1
R6
RES., CHIP, 61.9k, 0.1W, 1% 0603
VISHAY, CRCW060361K9FKEA
18
1
R9
RES., CHIP, 200k, 0.125W, 1% 0805
VISHAY, CRCW0805200KFKEA
19
1
R14
RES., CHIP, 15Ω, 0.1W, 1% 0603
VISHAY, CRCW060315R0FKEA
20
1
R3
RES., CHIP, 10k, 0.1W, 1% 0603
VISHAY, CRCW060310K0FKEA
21
2
R4, R10
RES., CHIP, 10Ω, 0.1W, 1% 0603
VISHAY, CRCW060310R0FKEA
22
1
R11
RES., CHIP, 20k, 3/4W, 1% 2010
VISHAY, CRCW201020K0FKEF
23
2
R12, R13
RES., CHIP, 100Ω, 0.1W, 1% 0603
VISHAY, CRCW0603100RFKEA
24
1
U1
I.C., LT3753EFE#TRPBF, TSSOP-38(31)
LINEAR TECH., LT3753EFE#TRPBF
DC2324A-A Required Circuit Components
25
4
CIN1–CIN4
CAP., X7S, 4.7µF, 100V, 10% 1210
MURATA, GRJ32DC72A475KE11L
26
1
C6
CAP., X7R, 47nF, 250V, 10% 1206
MURATA, GRM31CR72E473KW03L
27
1
Q1
N-MOSFET POWER-56
FAIRCHILD, FDMS86200DC
28
1
Q2
P-MOSFET POWER-33
VISHAY, Si7117DN-T1-E3
29
1
RCS1
RES., CHIP, 0.011Ω, 1W, 1%, WIDE 1206
SUSUMU, PRL1632-R011-F-T5
30
1
R5
RES., CHIP, 28k, 0.1W, 1% 0603
VISHAY, CRCW060328K0FKEA
31
1
R7
RES., CHIP, 3.48k, 0.1W, 1% 0603
VISHAY, CRCW06033K48FKEA
32
1
R8
RES., CHIP, 4.22k, 0.1W, 1% 0603
VISHAY, CRCW06034K22FKEA
33
1
T1
TRANSFORMER,
CHAMPS, G45R2-0808-S01-80R
DC2324A-B Required Circuit Components
25
4
CIN1-CIN4
CAP., X7R, 10µF, 50V, 10% 1210
MURATA, GRM32ER71H106KA12L
26
1
C6
CAP., X7R, 150nF, 250V, 10% 1210
MURATA, GRM32QR72E154KW01L
27
1
Q1
N-MOSFET POWER-56
FAIRCHILD, FDMS86101DC
28
1
Q2
P-MOSFET SOT23
VISHAY, Si2337DS-T1-GE3
29
1
RCS1
RES., CHIP, 0.005Ω, 1W, 1%, 0815
SUSUMU, RL3720WT-R005-F
30
1
R5
RES., CHIP, 40.2k, 0.1W, 1% 0603
VISHAY, CRCW060340K2FKEA
dc2324af
7
DEMO MANUAL DC2324A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
31
32
1
R7
RES., CHIP, 7.32k, 0.1W, 1% 0603
VISHAY, CRCW06037K32FKEA
1
R8
RES., CHIP, 8.66k, 0.1W, 1% 0603
VISHAY, CRCW06038K66FKEA
33
1
T1
TRANSFORMER,
CHAMPS, G45R2-0408-S01-25R
DC2324A-C Required Circuit Components
25
4
CIN1-CIN4
CAP., X7R, 22µF, 25V, 10% 1210
MURATA, GRM32ER71E226KE15L
26
1
C6
CAP., X7R, 330nF, 250V, 10% 1812
MURATA, GRM43DR72E334KW01L
27
1
Q1
N-MOSFET PG-TDSON
INFINEON, BSC010N04LSATMA1
28
1
Q2
P-MOSFET SC-70
VISHAY, SQ1421EEH-T1-GE3
29
1
RCS1
RES., CHIP, 0.003Ω, 1W, 1%, 0815
SUSUMU, RL3720WT-R003-F
30
1
R5
RES., CHIP, 40.2k, 0.1W, 1% 0603
VISHAY, CRCW060340K2FKEA
31
1
R7
RES., CHIP, 16.2k, 0.1W, 1% 0603
VISHAY, CRCW060316K2FKEA
32
1
R8
RES., CHIP, 19.6k, 0.1W, 1% 0603
VISHAY, CRCW060319K6FKEA
33
1
T1
TRANSFORMER,
CHAMPS, G45R2-0208-S01-8R0
Additional Demo Board Circuit Components for All Versions
1
0
CO2(OPT)
CAP., 1210
2
0
C8(OPT)
CAP., 100V, SIZE 12X10
Hardware: For Demo Board Only (All Versions)
1
2
E1, E2
TESTPOINT, TURRET, 0.061" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
2
4
E3, E4, E5, E6
TESTPOINT, TURRET, 0.094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
3
4
J1-J4
BANANA JACK
KEYSTONE, 575-4
4
4
MH1-MH4
STAND-OFF, NYLON 9.5mm
WURTH ELEKTRONIK, 702933000
8
dc2324af
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
-VIN
*
E4
J2
J1
C8
OPT
+
E2
GND
SGND
INTVCC
SYNC
TBLNK
TOS
TAS
TAO
IVSEC
OVLO
UVLO_VSEC
250V
2220
CY1
2200pF
5
EVAL1: EFE PACKAGE (FE38 (31) )
BOARD SIZE: 2.30 BY 1.45
U1
LT3753EFE
R1
C1
31.6K 0.1uF
C2
4.7uF
25V
0805
26
6
100K 14
13
12
11
8
10
9
C4
1uF
100V
0805
X7S
61.9K
0805
INTVCC
R2
R5
*
*
R7
R6
*
R8
R9 200K
R14
15
28
NOTE:
UNLESS OTHERWISE SPECIFIED:
ALL RESISTORS & CAPACITORS ARE 0603 .
ALL RESISTORS ARE 1% RESISTORS.
ALL CERAMIC CAPACITORS ARE X7R
E1
SYNC
*
CIN1
CIN2
CIN3
CIN4
1210
37
VIN
34
NC
E3
SS1
7
RT
3
36
NC
1
TEST2
2
TEST1
GND
18
4
4
0.1uF
C3
5
30
32
20
16
15
21
22
24
*
R12 100
24V / 5A
24V / 4A
18V - 36V
9V - 18V
24V / 5A
36V - 72V
-C
+VOUT
-B
+VIN
FOR ASSEMBLY
C5
0.1uF
C9
680pF
C0G R13 100
Q1
-A
VERSIONS
COMP
SOUT
AOUT
ISENSEN
NC
NC
ISENSEP
OC
OUT
PGND
PGND
38
39
NC
SS2
17
FB
4
PGND
19
+VIN
5
*
CIN1 - CIN4
D5
BAS516
R3
10K
RCS1
22uF / 25V
10uF / 50V
3
4.7uF / 100V,X7S
*
3
*
C6
330nF / 1812
150nF / 1210
47nF / 1206
Q2
C6
250V
12
11
7
5
*
8
*
T1
2
40.2K
40.2K
28K
R5
16.2K
7.32K
3.48K
R7
BAT54A-7-F
D4
FSW
CSW
19.6K
8.66K
4.22K
R8
10
R10
CSW
FSW
2
Si2337DS
SQ1421EEH
Si7117DN
BSC010N04LS
FDMS86101DC
3m / 0815
FDMS86200DC
Q2
20K
2010
R11
5m / 0815
Q1
BAV21W-TP
D3
C7
2.2nF
250V
0805
D1
CMMR1U-02
T1
CO1
10uF
50V
1210
CO2
1210
OPT
G45R2-0208-S01-8R0
G45R2-0408-S01-25R
G45R2-0808-S01-80R
L1
39uH
HRPQA2050-39
11m / Wide 1206
RCS1
10
R4
BAV21W-TP
D2
Q3
FDMS86200DC
Q4
FDMS86200DC
2
1
1
J3
E5
E6
J4
CSYS
+ 270uF
35V
EEHZA1V271P
+VO1
-VOUT
*
+VOUT
A
B
C
D
DEMO MANUAL DC2324A
Schematic Diagram
dc2324af
9
DEMO MANUAL DC2324A
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
10 Linear Technology Corporation
dc2324af
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