DC2015A - Demo Manual

DEMO MANUAL DC2015A
LT8310/LT8311
48VIN to 12V/12A
Forward Converter with
Synchronous Rectification
DESCRIPTION
Demonstration circuit 2015A is a resonant reset forward
converter with synchronous rectification featuring the
LT®8310/LT8311 chipset.
This circuit was designed to demonstrate the high levels of
performance, efficiency, and small solution size attainable
using these parts. It operates at 240kHz and produces a
regulated 12V, 12A output from an input voltage range
of 36V to 72V: suitable for telecom, industrial, and other
applications. It has an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94%.
The DC2015A circuit features soft-start which prevents
output voltage overshoot on startup or when recovering
from overload condition.
The DC2015A takes advantage of the LT8310’s input
undervoltage and overvoltage protection to shutdown the
system when the input voltage is outside of the set limits.
The DC2015A also has precise overcurrent protection
that allows for continuous operation under short-circuit
conditions. The low power dissipation under a short-circuit
condition insures high reliability even during a prolonged
output voltage short-circuit.
The LT8310/LT8311 data sheets give a complete description of the parts, operation and application information.
The data sheets must be read in conjunction with this
quick start guide for demo circuit 2015A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2015A
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
Specifications are at TA = 25°C
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Maximum Output Current, Continuous
fSW
Switching (Clock) Frequency
VOUT(P-P)
Output Ripple
VIN = 48V, IOUT = 12A (20MHz BW)
IREG
Output Regulation
Line and Load (36VIN to 72VIN, 0AOUT to 12AOUT)
POUT/PIN
CONDITIONS
MIN
TYP
36
11.7
200LFM Airflow
Efficiency (See Figure 3)
VIN = 48V, IOUT = 12A
Isolation
Basic
MAX
72
12.0
12
12.3
UNITS
V
V
A
240
kHz
80
mVP-P
±0.1
94
1500
%
%
VDC
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1
DEMO MANUAL DC2015A
QUICK START PROCEDURE
Demonstration circuit 2015A is easy to set up to evaluate
the performance of the LT8310/LT8311. 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 2.
1.Set an input power supply that is capable of 36V to
72V. Then turn off the supply.
2.Direct an airflow of 200LFM across the unit for sustained
operation at full load.
3.With power off, connect the supply to the input terminals
+VIN and –VIN.
a. Input voltages lower than 36V can keep the converter
from turning on due to the undervoltage lockout
feature of the LT8310/LT8311.
b.If efficiency measurements are desired, an ammeter
capable of measuring 10ADC can be put in series with
the input supply in order to measure the DC2015A’s
input current.
c. A voltmeter with a capability of measuring at least
72V can be placed across the input terminals in order
to get an accurate input voltage measurement.
4.Turn on the power at the input.
Note. Make sure that the input voltage does not exceed 100V.
5.Check for the proper output voltage of 12V. Turn off
the power at the input.
6.Once the proper output voltages are established, connect a variable load capable of sinking 12A at 12V to
the output terminals +VOUT and –VOUT. Set the current
for 0A.
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 12ADC
can be put in series with the output load in order to
measure the DC2015A’s output current.
b.A voltmeter with a capability of measuring at least 12V
can be placed across the output terminals in order
to get an accurate output voltage measurement.
7.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.
8.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.
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2
DEMO MANUAL DC2015A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
INPUT OR OUTPUT CAPACITOR
Figure 2. Proper Scope Probe Placement for Measuring Input/Output Ripple
100
98
EFFICIENCY (%)
96
94
92
90
88
86
84
48VIN
36VIN
72VIN
82
80
0
1
2
3
4 5 6 7 8 9 10 11 12
LOAD CURRENT (A)
dc2015a F03
Figure 3. Typical Efficiency Curve
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3
DEMO MANUAL DC2015A
QUICK START PROCEDURE
50mV/DIV
2µs/DIV
Figure 4. Output Ripple at 48VIN and 12AOUT (20MHz BW)
5A/DIV
200mV/DIV
200µs/DIV
Figure 5. Load Transient Response Waveform at 48VIN and 6AOUT to 12AOUT
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4
DEMO MANUAL DC2015A
QUICK START PROCEDURE
Figure 6. Thermal Map, Frontside at 48VIN and 12AOUT (TA = 25°C, 200LFM)
Figure 7. Thermal Map, Backside at 48VIN and 12OUT (TA = 25°C, 200LFM)
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5
DEMO MANUAL DC2015A
PARTS LIST
ITEM
QUANTITY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART #
Cap., X7R 4700pF 250V 20% 1812
Murata GA343DR7GD472KW01L
REQUIRED CIRCUIT COMPONENTS
1
1
C1
2
3
C2, C4, C23
3
1
C3
4
3
C5, C6, C24
Cap., X7S 4.7µF 100V 10% 1210
TDK C3225X7S2A475K
Cap., Alum 10µF 100V 20%
Sun Elect. Ind. Corp. 100HVH10M
Cap., X5R 47µF 16V 20% 1210
Taiyo Yuden EMK325BJ476MM
5
1
C7
Cap., U2J 390pF 250V 5% 0805
Murata GRM21A7U2E391JW31D
6
1
C9
Cap., Alum 470µF 16V 20%
Sun Elect. Ind. Corp. 16SVPE470M
7
2
C10, C14
Cap., X7R 22nF 25V 10% 0603
AVX 06033C223KAT1A
8
1
C11
Cap., X7S 1µF 100V 10% 0805
TDK C2012X7S2A105K
9
1
C12
Cap., X7R 0.01µF 25V 10% 0603
AVX 06033C103KAT2A
10
3
C13, C17, C19
Cap., X5R 4.7µF 16V 20% 0805
TDK C2012X5R1C475M
11
1
C15
Cap., NPO 100pF 25V 5% 0603
AVX 06033A101JAT2A
12
1
C16
Cap., X7R 0.1µF 25V 10% 0603
AVX 06033C104KAT2A
13
1
C18
Cap., X7R 3.9nF 25V 20% 0603
AVX 06033C392MAT2A
14
1
C20
Cap., NPO 220pF 25V 5% 0603
AVX 06033A221JAT1A
15
1
C25
Cap., U2J 3.9nF 250V 5% 0805
Murata GRM21B7U2E392JW32L
16
1
C26
Cap., X5R 1µF 25V 20% 0603
AVX 06033D105MAT2A
17
1
D2
Diode, 1A/200V SOD-123
Central Semi. CMMR1U-02
18
1
ISO1
Opto Iso., 2.5kV TRANS 4SOIC PbF
NEC PS2801C-1-P-A
19
1
L1
Inductor, 8µH
Champs Tech. PQA2050-08-LTC
20
1
L3
Inductor, 1µH
Coilcraft XAL6030-102MEC
21
1
Q1
MOSFET N-Channel, 200V/36A SuperSO8
Infineon BSC320N20NS3G
22
1
Q2
MOSFET, Single N-Chan. 100V/60A POWER-56
Fairchild Semi. FDMS86101
23
1
Q3
MOSFET N-Channel, 75V/100A SuperSO8
Infineon BSC042NE7NS3G
24
1
R1
Res., Chip 86.6k 0.10W 1% 0603
Vishay CRCW060386K6FKEA
25
1
R3
Res., Chip 100k 0.10W 1% 0603
Vishay CRCW0603100KFKEA
26
3
R4, R14, R36
Res., Chip 10k 0.10W 5% 0603
Vishay CRCW060310K0JNEA
27
1
R5
Res., Chip 11.3k 0.10W 1% 0603
Vishay CRCW060311K3FKEA
28
1
R6
Res., Chip 1.74k 0.10W 1% 0603
Vishay CRCW06031K74FKEA
29
4
R7, R17, R34, R35
Res/Jumper, Chip 0Ω 0.25W 5A 0603
Vishay CRCW06030000Z0EA
30
1
R8
Res., Chip 1.43k 0.10W 1% 0603
Vishay CRCW06031K43FKEA
31
1
R10
Res., Chip 10.0Ω 0.10W 1% 0603
Vishay CRCW060310R0FKEA
32
1
R11
Res., RL Vert. 0.010Ω 1W 1% 0815
SSM Thin Film Tech. RL3720WT-R010-F
33
2
R13, R38
Res., Chip 4.02k 0.10W 1% 0603
Vishay CRCW06034K02FKEA
34
1
R16
Res., Chip 3.32k 0.10W 1% 0603
Vishay CRCW06033K32FKEA
35
1
R18
Res., Chip 113k 0.10W 1% 0603
Vishay CRCW0603113KFKEA
36
1
R19
Res., Chip 20.0k 0.10W 1% 0603
Vishay CRCW060320K0FKEA
37
1
R23
Res/Jumper, Chip 0Ω 0.33W 6A
Vishay CRCW08050000ZOEA
38
1
R26
Res., Chip 41.2k 0.10W 1% 0603
Vishay CRCW060341K2FKEA
39
1
R27
Res., Chip 100k 0.10W 5% 0603
Vishay CRCW0603100KJNEA
40
1
R28
Res., Chip 178Ω 0.10W 1% 0603
Vishay CRCW0603178RFKEA
41
1
R29
Res., Chip 499k 0.10W 1% 0603
Vishay CRCW0603499KFKEA
dc2015af
6
DEMO MANUAL DC2015A
PARTS LIST
ITEM
QUANTITY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART #
42
1
R30
Res., Chip 560Ω 0.10W 5% 0603
Vishay CRCW0603560RJNEA
43
44
1
R32
Res., Chip 178Ω 0.125W 1% 0805
Vishay CRCW0805178RFKTA
1
R33
Res., Chip 20k 0.25W 5% 1206
Vishay CRCW120620K0JNED
45
1
R37
Res., Chip 499Ω 0.10W 1% 0603
Vishay CRCW0603499RFKEA
46
1
R39
Res., Chip 61.9k 0.10W 1% 0603
Vishay CRCW060361K9FKEA
47
1
T1
Transformer, 8:4 / (w/4T Pri. Aux)
Pulse PA0423
48
1
T2
Transformer, 1.25:1
Pulse PA3493NL
49
1
U1
I.C., Converter Controller TSSOP20-FE20(16)/CB
Linear Tech. Corp. LT8310EFE#PBF
50
1
U2
I.C., Converter Controller TSSOP20-FE20(16)/CB
Linear Tech. Corp. LT8311EFE#PBF
51
1
FAB, 2015A_Rev3.pcb
Demo Circuit 2015A
ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS
1
0
C27,C28
2
0
D1
Schottky Diode SMA
Cap., 0603
3
0
D3
Diode, Common Cathode SOT-23
Central Semi. Corp. CMSD2838
Inductor
Coilcraft LPS4414 series
4
0
L2
5
0
R9, R12
Res., 0805
6
0
R21, R22
Res., 0603
HARDWARE-FOR DEMO BOARD ONLY
1
8
E1, E2, E3, E4,
E5, E6, E7, E8
2
4
MH1-MH4
3
2
Turret, Testpoint
Mill Max 2501-2-00-80-00-00-07-0
Standoff, Nylon 0.25"
Keystone, 8831 (Snap-On)
Stencil (Top & Bottom)
Stencil DC2015A
dc2015af
7
8
A
B
C
D
SYNC
‐VIN
+VIN
36V to 72V
R14
10k
E5
E3
E1
C15
100pF
GND
100V
+ 10µF
C3
Coilcraft
E
VIN
R19
20.0k
1%
C4
4.7µF
100V
1210
L3
1µH
XAL6030‐102MEC
E
R39
61.9k
1%
C2
4.7µF
100V
1210
R36
10k
R27
100k
SS
FBX
VC
R38
4.02k
1%
R37
499
1%
C26
1µF
GATE
VIN
NC
21
GND
SOUT
INTVCC
RDVIN
SENSE
C18
3.9nF
5
6
INTVcc1
R26
41.2k
1%
DFLT
RT
SYNC
OVLO
UVLO
U1
LT8310EFE#PBF C16
0.1µF
8
10
9
7
3
1
R1
86.6k
1%
INTVcc1
R8
1.43k
1%
R6
1.74k
1%
C23
4.7µF
100V
1210
11
15
16
13
14
18
20
D
D
R10
INTVcc1
GND
C17
4.7µF
16V
0805
R18
113k
1%
10.0
1%
C12
0.01µF
C11
1µF
100V
0805
GND
R11
0.010
1%
0815
Q1
3
1
3
4
T2
PA3493NL
ISO1
PS2801C‐1‐P‐A
GND
220pF
C20
C7
390pF
250V
Murata
0805
6
1
5
T1
PA0423
2
SGND
2
1
4
6
11
7
C1
4700pF
250V
Murata
1812
CSW
C
R30
560
CSW
Q3
BSC042NE7NS3G
C
R32
178
1%
0805
178
1%
R28
CSW
Q2
FDMS86101
SGND
SGND
20
16
5
3
16V
0805
C13
4.7µF
R33
20k
1206
CSP
CG
FG
FSW
CSW
SGND
1
2
8µH
Champs Tech.
PQA2050‐08‐LTC
1
L1
CMMR1U‐02
D2
18
CSN
VIN
7
SS
14
22nF
C10
SGND
PGOOD
13
R29
499k
1%
12
TIMER
B
C19
4.7µF
16V
0805
6
INTVcc
INTVCC
SGND
21
GND
SYNC
OPTO
PMODE
COMP
FB
15
9
8
10
11
R3
100k
1%
PGOOD
E8
R4
10k
LT8311EFE#PBF U2
C25
3.9nF
250V
Murata
0805
B
C14
4.02k
1%
R16
3.32k
1%
INTVcc
22nF
R5
11.3k
1%
R13
SGND
SGND
C5
47µF
16V
1210
C6
47µF
16V
1210
C24
47µF
16V
1210
A
A
E2
E6
E7
E4
C9
+ 470µF
16V
VOUT
‐VOUT
+VOUT
12V / 12A
A
B
C
D
DEMO MANUAL DC2015A
SIMPLE SCHEMATIC DIAGRAM
dc2015af
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
SYNC
‐VIN
+VIN
36V to 72V
R14
10k
E5
E3
E1
C15
100pF
GND
100V
C3
+ 10µF
Coilcraft
E
VIN
R19
20.0k
1%
C4
4.7µF
100V
1210
L3
1µH
XAL6030‐102MEC
E
R39
61.9k
1%
C2
4.7µF
100V
1210
R36
10k
R27
100k
SS
FBX
VC
R38
4.02k
1%
R37
499
1%
C26
1µF
GATE
VIN
NC
21
GND
SOUT
INTVCC
RDVIN
SENSE
C18
3.9nF
5
6
INTVcc1
R26
41.2k
1%
DFLT
RT
SYNC
OVLO
UVLO
U1
LT8310EFE#PBF C16
0.1µF
8
10
9
7
3
1
R1
86.6k
1%
INTVcc1
R8
1.43k
1%
R6
1.74k
1%
C23
4.7µF
100V
1210
11
15
16
13
14
18
20
D
D
R10
INTVcc1
GND
(Opt)
LPS4414
C17
4.7µF
16V
0805
3
R11
0.010
1%
0815
Q1
GND
L2
R18
113k
1%
10.0
1%
C12
0.01µF
0 Ohm
R7
C11
1µF
100V
0805
C20
GND
1
2
3
1
3
4
T2
PA3493NL
ISO1
PS2801C‐1‐P‐A
GND
220pF
(Opt)
SOT‐23
D3
C7
390pF
250V
Murata
0805
GND
6
1
5
T1
PA0423
2
SGND
2
1
4
6
11
7
C1
4700pF
250V
Murata
1812
FSW
CSW
C
R30
560
R23
0 Ohm
CSW
SGND
D2
2
(Opt)
0805
0 Ohm
R12
(Opt)
0805
R35
R9
0 Ohm
R34
R32
178
1%
R28
(Opt)
178
1%
0805
R22
CSW
C28
(Opt)
20
16
5
3
16V
0805
C13
4.7µF
R33
20k
1206
CSP
CG
FG
FSW
CSW
SGND
1
8µH
Champs Tech.
PQA2050‐08‐LTC
1
L1
CMMR1U‐02
Q2
FDMS86101
SGND
CSW
Q3
BSC042NE7NS3G
C
18
CSN
VIN
7
SS
14
22nF
C10
SGND
PGOOD
13
R29
499k
1%
12
TIMER
B
C19
4.7µF
16V
0805
6
INTVcc
INTVCC
SGND
21
GND
SYNC
OPTO
PMODE
COMP
FB
15
9
8
10
11
R3
100k
1%
PGOOD
E8
R4
10k
LT8311EFE#PBF U2
C25
3.9nF
250V
Murata
0805
B
22nF
C14
SGND
SGND
R16
3.32k
1%
SGND
C6
47µF
16V
1210
R21
(Opt)
R17
0 Ohm
INTVcc
4.02k
1%
11.3k
1%
R13
R5
C27
(Opt)
C5
47µF
16V
1210
C24
47µF
16V
1210
A
A
D1
(Opt)
SMA
E2
E6
E7
E4
C9
+ 470µF
16V
VOUT
‐VOUT
+VOUT
12V / 12A
A
B
C
D
DEMO MANUAL DC2015A
FULL SCHEMATIC DIAGRAM
dc2015af
9
DEMO MANUAL DC2015A
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
dc2015af
10 Linear Technology Corporation
LT 0914 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
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