DC2306A - Demo Manual

DEMO MANUAL DC2306A
LT3753
Active Clamp
Forward Converter
Description
Demonstration circuit 2306A is an active clamp forward
converter featuring the LT®3753.
This circuit was designed to demonstrate the high level of
performance and efficiency that can be attained with the
LT3753. It operates at 100kHz and produces a regulated
54V, 1.5A output from a wide input voltage range of 10V
to 54V, making it suitable for telecom, industrial, and other
applications. The output voltage of this circuit is jumper
selectable between 54V and 48V.
The DC2306 circuit features soft-start which prevents
output voltage overshoot during startup or when recovering from overload condition.
Performance Summary
SYMBOL
PARAMETER
VIN
Input Supply Range
The DC2306 also has precise overcurrent protection circuit
that allows for continuous operation under short circuit
conditions. The low power dissipation under short circuit
conditions insures high reliability even during short circuits.
Please refer to LT3753 data sheet for design details and
applications information.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2306A
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
MIN
TYP
10
VOUT
Output Voltage
53
IOUT
Maximum Output Current, Continuous
1.5
fSW
Switching (Clock) Frequency
VOUT P-P
Output Ripple
VIN = 12V, IOUT = 1.5A (20MHz BW)
IREG
Output Regulation
Line and Load (10VIN to 54VIN, 0A to 1.5AOUT)
POUT /PIN
Efficiency (See Figure 2)
VIN =12V, IOUT = 1.5A
54
MAX
UNITS
54
V
55
V
A
100
kHz
40
mVP–P
±0.1
%
93
%
dc2306af
1
DEMO MANUAL DC2306A
Quick Start Procedure
Demonstration circuit 2306A 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:
NOTE: When measuring the 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 and ground ring directly across the last output
capacitor as shown in Figure 1.
1.Set an input power supply that is capable of 10V to 54V
to 10V. Then turn off the supply.
2.With power off, connect the supply to the input terminals
+VIN and –VIN.
a. Input voltages lower than 10V can keep the converter
from turning on due to the undervoltage lockout
feature of the LT3753.
b.If efficiency measurements are desired, an ammeter
capable of measuring 9Adc can be put in series with
the input supply in order to measure the DC2306A’s
input current.
c. A voltmeter with a capability of measuring at least
54V can be placed across the input terminals in order
to get an accurate input voltage measurement.
2
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 54V. Turn off
the power at the input.
5.Once the proper output voltages are established, connect a variable load capable of sinking 1.5A at 54V to
the output terminals +VOUT and –VOUT. Set the current
for 0A.
a. If efficiency measurements are desired, an ammeter
that is capable of handling 1.5Adc can be put in
series with the output load in order to measure the
DC2306A’s output current.
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.
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.
dc2306af
DEMO MANUAL DC2306A
Quick Start Procedure
Figure 1. Proper Measurement Equipment Setup
100
95
PERCENTAGE (%)
90
85
80
75
70
VIN = 10V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 54V
65
60
55
50
0
0.3
0.6
0.9
LOAD CURRENT(A)
1.2
1.5
DC2306A F02
Figure 2. Efficiency vs Load Current
dc2306af
3
DEMO MANUAL DC2306A
Quick Start Procedure
500mA/DIV
20mV/DIV
500mV/DIV
5µs/DIV
DC2306A F03
Figure 3. Output Ripple at 12VIN and 1.5AOUT (20MHz BW)
Figure 5. Thermal Map, Front Side
at 12VIN and 1.5AOUT (TA = 25°C)
4
500µs/DIV
DC2306A F04
Figure 4. Transient Response Waveform
at 12VIN and 0.75AOUT to 1.5AOUT
Figure 6. Thermal Map, Backside at
12VIN and 1.5AOUT (TA = 25°C)
dc2306af
DEMO MANUAL DC2306A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
8
CIN1-CIN6, CO1, CO2
CAP., X7S, 4.7µF, 100V, 10%, 1210
TDK, CGA6M3X7S2A475K
2
1
CIN7
CAP., ALUM, 56µF, 63V
SUN ELEC., 63HVH56M
3
1
CSYS
CAP., ALUM, 47µF, 63V
SUN ELEC., 63HVH47M
4
1
CY1
CAP., X7R, 2200pF, 250V, 10%, 1812
MURATA, GA343QR7GD222KW01L
5
1
C1
CAP., X7R, 1µF, 25V, 10%, 0603
MURATA, GRM188R71E105KA12D
6
1
C2
CAP., X7R, 4.7µF, 25V, 10%, 0805
MURATA, GRM21BR61E475KA12L
7
1
C3
CAP., X7R, 22nF, 25V, 10%, 0603
MURATA, GRM188R71E223KA01D
8
1
C4
CAP., X7S, 1µF, 100V, 10%, 0805
TDK, C2012X7S2A105K
9
1
C5
CAP., X7R, 100pF, 50V, 10%, 0603
AVX, 06035C101KAT2A
10
1
C7
CAP., X7R, 2200pF, 50V, 10%, 0603
MURATA, GRM188R71H222KA01D
11
1
C8
CAP., U2J, 2200pF, 630V, 10%, 1206
MURATA, GRM31A7U2J222JW31D
12
1
C12
CAP., X7R, 0.1µF, 50V, 10%, 0603
MURATA, GRM188R71H104KA93D
13
1
C13
CAP., X5R, 2.2µF, 25V, 10%, 0603
TDK, C1608X5R1E225K080AB
14
1
C14
CAP., X7R, 0.22µF, 100V, 10%, 1206
TDK, C3216X7R2A224K115AA
15
1
C18
CAP., C0G, 4.7nF, 50V, 5%, 0603
MURATA, GRM1885C1H472JA01D
16
1
C21
CAP., NP0, 3900pF, 50V, 10%, 0603
MURATA, GRM1885C1H392JA01D
17
1
C22
CAP., X7R, 2.2pF, 50V, 10%, 0805
MURATA, GRM21BR71E225KA73L
18
1
D1
DIODE,SiC SCHOTTKY, DIODE, 600V, 4A, DPAK
INFINEON, IDD04SG60C
19
1
D2
DIODE, 600V, 10A, TLM364
CENTRAL SEMI., CTLHR10-06
20
1
D3
DIODE, 600V, 1A, SOD123F
CENTRAL SEMI., CMMR1U-06
21
1
D4
DIODE, ZENER, 10V, SOD-123
CENTRAL SEMI., CMHZ4697
22
1
D5
DIODE, HIGH-SPEED DIODE, SOD-523
NXP/PHILLIPS SEMI., BAS516
23
1
L1
INDUCTOR, 330µH
CHAMPS, PQA2050-330
24
1
Q1
MOSFET, N-CH, 100V, PG-TDSON-8
INFINEON, BSC040N10NS5
25
1
Q3
MOSFET, P-CH, 100V, 4.2A, DPAK
INFINEON, SPD04P10PL G
26
1
RCS1
RES., CHIP, 0.004Ω, 1W, 1%, 0815
SUSUMU, RL3720WT-R004-F
27
1
R1
RES., CHIP, 82.5k, 0.1W, 1%, 0603
VISHAY, CRCW060382K5FKEA
28
1
R2
RES., CHIP, 100k, 0.1W, 1%, 0603
VISHAY, CRCW0603100KFKEA
29
2
R4, R17
RES., CHIP, 0Ω, 0.1W, 1%, 0603
VISHAY, CRCW06030000Z0EA
30
1
R5
RES., CHIP, 44.2k, 0.1W, 1%, 0603
VISHAY, CRCW060344K2FKEA
31
1
R6
RES., CHIP, 187k, 0.1W, 1%, 0603
VISHAY, CRCW0603187KFKEA
32
1
R7
RES., CHIP, 2.55k, 0.1W, 1%, 0603
VISHAY, CRCW06032K55FKEA
33
1
R8
RES., CHIP, 12.7k, 0.1W, 1%, 0603
VISHAY, CRCW060312K7FKEA
34
1
R9
RES., CHIP, 100k, 1/8W, 1%, 0805
VISHAY, CRCW0805100KFKEA
35
3
R10, R11, R23
RES., CHIP, 100Ω, 0.1W, 1%, 0603
VISHAY, CRCW0603100RFKEA
36
2
R12, R13
RES., CHIP, 124k, 1W, 1%, 2512
VISHAY, CRCW2512124KFKEG
37
1
R15
RES., CHIP, 1.5k, 0.1W, 5%, 0603
VISHAY, CRCW06031K50JNEA
38
1
R16
RES., CHIP, 56.2k, 0.1W, 1%, 0603
VISHAY, CRCW060356K2FKEA
39
1
R18
RES., CHIP, 100k, 0.1W, 5%, 0603
VISHAY, CRCW0603100KJNEA
40
1
R19
RES., CHIP, 59k, 0.1W, 1%, 0603
VISHAY, CRCW060359K0FKEA
41
1
R20
RES., CHIP, 196k, 0.1W, 1%, 0603
VISHAY, CRCW0603196KFKEA
dc2306af
5
DEMO MANUAL DC2306A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
42
1
R21
RES., CHIP, 3.01k, 0.1W, 1%, 0603
VISHAY, CRCW06033K01FKEA
43
1
R22
RES., CHIP, 2k, 0.1W, 1%, 0603
VISHAY, CRCW06032K00FKEA
44
1
R24
RES., CHIP, 340Ω, 0.1W, 1%, 0603
VISHAY, CRCW0603340RFKEA
45
1
R25
RES., CHIP, 10k, 0.1W, 1%, 0603
VISHAY, CRCW060310K0FKEA
46
1
R27
RES., CHIP, 1.5M, 0.1W, 1%, 0603
VISHAY, CRCW06031M50FKEA
47
1
R28
RES., CHIP, 9.53k, 0.1W, 1%, 0603
VISHAY, CRCW06039K53FKEA
48
1
R29
RES., CHIP, 10k, 0.25W, 1%, 1206
VISHAY, CRCW120610K0FKEA
49
1
T1
TRANSFORMER
CHAMPS, P26R2-0322-18R0
50
1
U1
I.C., LT3753EFE#TRPBF, TSSOP-38(31)
LINEAR TECH., LT3753EFE#TRPBF
51
1
U2
I.C., PS2801C-1-P-A
NEC, PS2801C-1-P-A
52
1
U3
I.C. LT1431CS8, SO8
LINEAR TECH., LT1431CS8#TRPBF
Additional Demo Board Circuit Components
1
0
CO3 (OPT)
CAP., 1210
2
0
C6 (OPT)
CAP., 0603
3
0
C15 (OPT)
CAP., X7R, 0.47µF, 100V, 10%, 1206
4
0
C20 (OPT)
CAP., 0603
5
0
R3 (OPT)
RES., 0603
6
0
R26 (OPT)
RES., CHIP, 200, 1/2W, 1%, 1210
Hardware: For Demo Board Only
6
1
2
E1, E2
TESTPOINT, TURRET, .061" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
2
4
E3-E6
TESTPOINT, TURRET, .094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
3
2
J1, J2
BANANA JACK
KEYSTONE, 575-4
4
1
JP1
CONN., HEADER, 1×3, 2mm
WURTH ELEKTRONIK, 620 003 111 21
5
1
XJP1
SHUNT, 2mm
WURTH ELEKTRONIK, 608 002 134 21
6
4
MH1-MH4
STAND-OFF, NYLON 0.25"
KEYSTONE, 8831(SNAP ON)
7
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 2306A
8
2
STENCIL (TOP & BOTTOM)
STENCIL DC2306A
dc2306af
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
-VIN
+VIN
10V - 54V
E4
J2
J1
E3
GND
SYNC
+
5
R22
2K
C6
4.7uF
100V
1210
44.2K 11
R5
13
12
8
C2
4.7uF
25V
0805
INTVCC
SYNC
TBLNK
TOS
TAS
TAO
IVSEC
OVLO
UVLO_VSEC
100KHz
R1
82.5K
250V
1812
CY1
2200pF
26
6
100K 14
INTVCC
R2
187K
R6
10
2.55K
R7
9
12.7K
0805
100K
C4
1uF
100V
0805
R8
OPT
R9
R17
0
EVAL1: EFE PACKAGE (FE38 (31) )
BOARD SIZE: 4.70" BY 2.90"
4
LT3753EFE
U1
COMP
SOUT
AOUT
22nF
1uF
4
NC
NC
ISENSEN
C3
SGND
OC
OUT
ISENSEP
C1
NOTE:
UNLESS OTHERWISE SPECIFIED:
ALL RESISTORS & CAPACITORS ARE 0603 .
ALL RESISTORS ARE 1% MULTILAYER RESISTORS.
ALL CERAMIC CAPACITORS ARE X7R
E1
E2
CIN7
56uF
63V
63HVH56M
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
28
D
37
VIN
34
NC
3
SS1
7
RT
36
NC
1
TEST2
2
TEST1
GND
18
38
39
NC
17
SS2
PGND
PGND
FB
4
PGND
19
5
5
30
32
20
16
15
21
22
24
100pF
C5
0
OPT
R18
100K
C7
2.2nF
R21 3.01K
R4
R3
R19
59K
INTVCC
R11
100
R10
100
C12
0.1uF
C13
2.2uF
R23
100
Q1
BSC040N10NS5
3
3
R24
340
3
4
C22
2.2uF
25V
0805
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
CO1
4.7uF
100V
1210
DATE:
N/A
SIZE
5
GND-S
TECHNOLOGY
6
GND-F
RMID
RTOP
REF
COMP
2
CO3
OPT
1210
COLLECTOR
V+
3
CO2
4.7uF
100V
1210
+VO1
R20
196K
+VO1
E6
CSYS
47uF
63V
63HVH47M
R28
9.53K
R27
1.5M
C20
OPT
-VOUT
JP1
+VOUT
+54V / 1.5A
54V
48V
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
7
4
8
+
E5
1
1
SHEET
LT3753EFE
DEMO CIRCUIT 2306A
Thursday, July 23, 2015
IC NO.
1
OF
1
4
REV.
10-54VIN, 54VOUT ACTIVE CLAMP FORWARD CONVERTER
TITLE: SCHEMATIC
U3
LT1431CS8
C21
3.9nF
R16
56.2K
R13
124K
2512
D4
CMHZ4697
R29
10K
1206
+VO1
CUSTOMER NOTICE
C18
4.7nF
R12
124K
2512
C8
2.2nF
630V
1206
D3
CMMR1U-06
L1
330uH
PQA2050-330
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.
2
1
R15
1.5K
Q3
SPD04P10PL G
U2
PS2801-1
D5
BAS516
0.004
0815
R26
200
OPT
1210
C15
0.47uF
OPT
1206
100V
CTLHR10-06
D2
D1
IDD04SG60C
C14
220nF
1206
100V
13
6
RCS1
9
2
R25
10K
T1
P26R2-0322-18R0
2
A
B
C
D
DEMO MANUAL DC2306A
Schematic Diagram
dc2306af
7
DEMO MANUAL DC2306A
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
8
dc2306af
Linear Technology Corporation
LT 0815 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2015
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