DC2199A-A - Demo Manual

DEMO MANUAL DC2199A-A
LTC3765/LTC3766
360W Isolated Forward Converter
with Synchronous Rectification
DESCRIPTION
Demonstration circuit 2199A-A is a 360W isolated forward converter with synchronous rectification featuring
the LTC3765/LTC3766. It produces a regulated 12V, 30A
output from an input voltage range of 36V to 60V.
This circuit was designed to demonstrate the high levels
of performance, efficiency, and small solution size attainable using these parts in an active-clamp-reset forward
converter power supply, suitable for telecom, industrial,
and other applications. It has a 4.7in2 solution footprint
area. Synchronous rectification helps to attain an effi-
PERFORMANCE SUMMARY
ciency exceeding 96%. Secondary-side control eliminates
complex opto-coupler feedback, providing fast transient
response with minimum output capacitance. For other
output requirements, see the LTC3766 data sheet or
contact the LTC sales.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2199A-A
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
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Output Current Range, Continuous
fSW
Switching (Clock) Frequency
VOUT(P-P)
Output Ripple
VIN = 24V, IOUT = 30A (20MHz BW)
IREG
Output Regulation
Line and Load (36VIN to 60VIN, 0AOUT to 30AOUT)
POUT/PIN
CONDITIONS
MIN
TYP
36
11.76
200LFM
Efficiency (See Figure 3)
VIN =48V, IOUT = 30A
Isolation
Basic
Approximate Solution Size
Component Area × Top Component Height
12.0
0
MAX
UNITS
60
V
12.24
V
30
A
200
kHz
60
mVP-P
±0.02
96
1500
4.7in2 × 0.6
%
%
VDC
Inches
dc2199aafa
1
DEMO MANUAL DC2199A-A
OPERATING PRINCIPLES
The LTC3765 active clamp forward controller and gate
driver is used on the primary and provides start-up, gate
drive, and protection functions. Once start-up is accomplished, the LTC3766 high efficiency, secondary-side
synchronous forward controller takes over, and provides
the LTC3765 with timing information and bias power
through a small pulse transformer.
When input voltage is applied, the LTC3765 commences
soft-start of the output voltage. When the output reaches
the RUN threshold, the LTC3766 comes alive and takes
control by sending encoded PWM gate pulses to the
LTC3765 through T2. These pulses also provide primary
bias power efficiently over a wide input voltage range.
The transition from primary to secondary control occurs
at some fraction of the nominal output voltage. From then
on, operation and design is reduced to that of a simple
buck converter. Secondary control eliminates delays, tames
large-signal overshoot, and reduces output capacitance
needed to meet transient response requirements.
An optional LC filter stage on the input lowers RMS input
current. The filter must have output impedance that is less
than the converter input impedance to assure stability.
This may require a damping impedance, which is provided
by R1. (See Linear Technology Application Note 19 for a
discussion of input filter stability.) R1 is coupled through
a tiny 2mm × 2mm inductor L1, and provides damping
with arbitrarily low source impedance. For bench testing,
an electrolytic capacitor has been added at the input terminals to provide suitable ripple current capability. The
values selected have a filter resonant frequency that is
below the converter switching frequency, thus avoiding
high circulating currents in the filter.
QUICK START PROCEDURE
Demonstration circuit 2199A-A is easy to set up to evaluate the performance of the LTC3765/LTC3766. Refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
b.If efficiency measurements are desired, an ammeter
capable of measuring 15ADC or a resistor shunt can
be put in series with the input supply in order to
measure the DC2199A-A’s input current.
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.
c. A voltmeter with a capability of measuring at least
60V can be placed across the input terminals in order
to get an accurate input voltage measurement.
1.Set an input power supply that is capable of 36V to 60V
to 36V. 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 LTC3765/LTC3766.
4.Turn on the power at the input.
NOTE: Make sure that the input voltage never exceeds 60V.
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 30A 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 30ADC
can be put in series with the output load in order to
measure the DC2199A-A’s output current.
dc2199aafa
2
DEMO MANUAL DC2199A-A
QUICK START PROCEDURE
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.
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.
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
98
18
97
16
96
14
95
12
94
10
93
8
92
36VIN
48VIN
60VIN
48VIN_PD
91
90
0
5
10
15
IOUT (A)
20
25
30
6
POWER DISSIPATION (W)
EFFICIENCY? (%)
Figure 1. Proper Measurement Equipment Setup
4
2
dc2199aa F02
Figure 2. Efficiency and Power Dissipation
dc2199aafa
3
DEMO MANUAL DC2199A-A
QUICK START PROCEDURE
Figure 3. Output Ripple at 48VIN and 30AOUT (50mV, 10A, 2µs/DIV, 20MHz)
Figure 4. Transient Response Waveform at 48VIN and 15A to 30A to 15AOUT (10A, 500mV, 200µs/DIV)
dc2199aafa
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DEMO MANUAL DC2199A-A
QUICK START PROCEDURE
Figure 5. Thermal Map, Front Side at 48VIN and 30AOUT (TA = 25°C, 200LFM)
Figure 6. Thermal Map, Back Side at 48VIN and 30AOUT (TA = 25°C, 200LFM)
dc2199aafa
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DEMO MANUAL DC2199A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
PANASONIC, EEHZA1K330P
Required Circuit Components
1
2
C1, C22
Cap., Alum., Elect., 33µF, 80V, CAP-10X12.5
2
5
C2, C3, C4, C5, C6
CAP., X7R, 4.7µF, 100V, 10%, 1210
MURATA, GRM32ER72A475KE14
3
4
C7, C31, C33, C68
CAP., POSCAP, 150µF, 16V, 20%, 7343
PANASONIC, 16TQC150MYF
4
1
C10
CAP., X7R, 2.2nF, 630V, 5%, 1206
MURATA, GRM31A7U2J222JW31
5
1
C11
CAP., X7R, 0.015µF, 25V, 10%, 0603
AVX, 06033C153KAT2A
6
2
C24, C71
CAP., X7R, 1.0µF, 16V, 10%, 0805
MURATA, GRM21BR71C105KA01
7
1
C30
CAP., X7R, 2200pF, 250V, 10%, 1812
MURATA, GA343QR7GD222KW01L
8
1
C34
CAP., X5R, 22µF, 16V, 20%, 1206/1210
MURATA, GRM32ER71C226MEA8L
9
1
C51
CAP., C0G, 470pF, 630V, 5%, 1206
MURATA, GRM31A5C2J471JW01
10
1
C66
CAP., X7R, 0.047µF, 200V, X7R, 10% 1206
MURATA, GRM31CR72D473KW03
11
1
C69
CAP., X7R, 1.5nF, 630V, 5%, 1206
MURATA, GRM31A7U2J152JW31
12
2
C70, C76
CAP., X7R, 3.3nF, 25V, 10%, 0603
AVX, 06033C332KAT2A
13
2
C72, C102
CAP., X7R, 0.1µF, 25V, 10%, 0805
AVX, 08053C104KAT2A
14
4
C55, C73, C80, C119
CAP., X7R, 1nF, 25V, 10%, 0603
MURATA, GRM188R71E102KA01
15
1
C75
CAP., NPO, 100pF, 25V, 5%, 0603
AVX, 06033A101JAT2A
16
1
C77
CAP., X7R, 4.7µF, 25V, 10%, 1206
AVX, 12063C475KAT2A
17
1
C78
CAP., NPO, 0.033µF, 25V, 5%, 0805
TDK, C2012C0G1E333J
18
1
C79
CAP., X7R, 4.7nF, 25V, 10%, 0603
MURATA, GRM188R71E472KA01
19
1
C101
CAP., NPO, 220pF, 25V, 5%, 0603
AVX, 06033A221JAT2A
20
1
C106
CAP., COG, 150pF, 250V, 5%, 0603
TDK, C1608C0G2E151J080AA
21
1
C112
CAP., X7R, 0.22µF, 250V, 10%, 1206/1210
TDK C3225X7R2E224K
22
1
C113
CAP., X7R, 0.033µF, 25V, 10%, 0603
AVX, 06033C333KAT2A
23
1
C118
CAP., NPO, 1500pF, 5%, 0603
AVX, 06033A152JAT2A
24
2
D1, D34
DIODE ULTRA FAST 1A, 200V, SMP
VISHAY, ES1PD-M3 / 84A
25
3
D27, D29, D30
DIODE SCHOTTKY 60V, 0.5A, SOT23
DIODES INC, ZHCS506TA
26
1
D40
DIODE, 1N4148WS, SOD323
VISHAY, 1N4148WS-E3-08
27
1
L1
INDUCTOR, 1.0µH, 20%
COILCRAFT, XPL2010-102ML
28
1
L2
INDUCTOR, 2.0µH, 20%
VISHAY, IHLP4040DZER2R0M11
29
1
L3
INDUCTOR, 3.3µH, 10%
COILCRAFT, SER2915L-332KL
30
2
Q8, Q9
MOSFET N-CH 150V, POWERPAK-SO-8
INFINEON, BSC190N15NS3 G
31
4
Q12, Q13, Q14, Q15
MOSFET N-CH 80V, POWERPAK-SO-8
INFINEON, BSC028N06NS3
32
1
Q27
TRANS., NPN 40V, 1A, SOT-89
DIODE INC., FCX491ATA
33
1
Q28
MOSFET, N-CH, SUPER, SOT-6
FAIRCHILD, FDC2512-NL
34
1
Q29
MOSFET, P-CH, IRF6217, POWERPAK-SO-8
IR, IRF6217TRPBF
35
1
R1
RES., CHIP, 0.33, 1/4W, 5%, 2512
PANASONIC, ERJ-1TRQJR33U
36
1
R4
RES., CHIP, 8.2k, 1W, 5%, 2512
PANASONIC, ERJ-1TYJ822U
37
1
R18
RES., CHIP, 102k, 1/8W, 1%, 0805
VISHAY, CRCW0805102KFKEA
38
1
R22
RES., CHIP, 3.74k, 1/16W, 1%, 0603
VISHAY, CRCW06033K74FKEA
39
2
R23, R24
RES., CHIP, 8.2, 1/4W, 5%, 1206
VISHAY, CRCW12068R20JKEA
40
1
R29
RES., CHIP, 100k, 1/8W, 5%, 0805
VISHAY, CRCW0805100KJNEA
41
1
R41
RES., CHIP, 11.5k, 1/16W, 1%, 0603
VISHAY, CRCW060311K5FKEA
dc2199aafa
6
DEMO MANUAL DC2199A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
42
43
1
R42
RES., CHIP, 1k, 1/16W, 1%, 0603
VISHAY, CRCW06031K00FKEA
1
R46
RES., CHIP, 604, 1/16W, 1%, 0603
VISHAY, CRCW0603604RFKEA
44
2
R51, R52
RES., CHIP, 3.0, 1/4W, 5%, 1206
PANASONIC, ERJ-8GEYJ3R0V
45
1
R53
RES., CHIP, 6.8, 1/2W, 1%, 1206
PANASONIC, ERJ-8RQF6R8V
46
1
R68
RES., CHIP, 2.15k, 1/16W, 1%, 0603
VISHAY, CRCW06032K15FKEA
47
1
R69
RES., CHIP, 46.4k, 1/16W, 1%, 0603
VISHAY, CRCW060346K4FKEA
48
1
R75
RES., CHIP, 215, 1/8W, 1%, 0805
VISHAY, CRCW0805215RFKEA
49
1
R76
RES., CHIP, 4.22, 1/8W, 1%, 0805
VISHAY, CRCW08054R22FKEA
50
1
R84
RES., CHIP, 1.21k, 1/8W, 1%, 0805
VISHAY, CRCW08051K21FKEA
51
4
R101, R148, R149, R151
RES., CHIP, 100, 1/16W, 1%, 0603
VISHAY, CRCW0603100RFKEA
52
1
R109
RES., CHIP, 10k, 1/16W, 1%, 0603
VISHAY, CRCW060310K0FKEA
53
1
R110
RES., CHIP, 1.20, 1/2W, 1%, 1206
SUSUMU, RL1632S-1R20-F
54
1
R114
RES., CHIP, 28.7k, 1/16W, 1%, 0603
VISHAY, CRCW060328K7FKEA
55
1
R117
RES., CHIP, 12.7k, 1/16W, 1%, 0603
VISHAY, CRCW060312K7FKEA
56
1
R118
RES., CHIP, 681k, 1/16W, 1%, 0603
VISHAY, CRCW0603681KFKEA
57
1
R121
RES., CHIP, 133k, 1/16W, 1%, 0603
VISHAY, CRCW0603133KFKEA
58
1
R123
RES., CHIP, 118k, 1/16W, 1%, 0603
VISHAY, CRCW0603118KFKEA
59
1
R125
RES., CHIP, 17.4k, 1/16W, 1%, 0603
VISHAY, CRCW060317K4FKEA
60
1
R136
RES., CHIP, 0.005, 1W, 1%, 1225
SUSUMU, KRL6432D-M-R005-F-T5
61
1
R139
RES., CHIP, 26.7k, 1/16W, 1%, 0603
VISHAY, CRCW060326K7FKEA
62
1
R140
RES., CHIP, 274, 1/8W, 1%, 0805
PANASONIC, ERJ-6ENF2740V
63
1
R150
RES., CHIP, 14.3k, 1/16W, 1%, 0603
VISHAY, CRCW060314K3FKEA
64
1
T1
TRANSFORMER
CHAMPS TECH., LTC-PQ26-0402
65
1
T2
TRANSFORMER, 1.25:1
Pulse, PA3493NL
66
1
T3
TRANSFORMER, 1:100, CT02-100
ICE COMPONENTS, CT02-100 = 1:100
67
1
U1
I.C. LTC3765EMSE, MSOP-16PIN
LINEAR TECH., LTC3765EMSE#PBF
68
1
U2
I.C. LTC3766EGN, SSOP-GN28
LINEAR TECH., LTC3766EGN#PBF
Additional Demo Board Circuit Components
1
0
C12, C13, C14, C16, C20
CAP., OPT, 0603
OPT
2
0
C8, C9, C18, C19, C103, C111
CAP., OPT, 0603
OPT
3
0
C15, C21, C114
CAP., OPT, 0805
OPT
4
0
C17, C116
CAP., OPT, 1206
OPT
5
0
C23, C25, C26
CAP., OPT, CAP-SVPF-E12
OPT
6
2
C74, C105
CAP, 0Ω, JUMPER 0603
VISHAY, CRCW06030000Z0EA
7
0
D2
DIODE TBD SOD323
OPT
8
0
D4, D35
DIODE OPT, SOD323
OPT
9
0
D28, D37, D38
DIODE OPT, SOT23
OPT
10
0
L4
INDUCTOR, OPT, DO1606T
OPT
11
0
Q1, Q2
MOSFET, OPT, SOT23-6
OPT
12
0
Q4
MOSFET, OPT, D-PAK
OPT
13
0
Q11, Q23, Q24
MOSFET, OPT, POWERPAK-SO-8
OPT
14
0
R5
RES., OPT, 2512/2010
OPT
dc2199aafa
7
DEMO MANUAL DC2199A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
15
13
R6, R7, R8, R9, R49, R103, R111, R112,
R113, R122, R124, R137, R146
RES., CHIP, 0Ω, 0603
VISHAY, CRCW06030000Z0EA
16
0
R10, R13, R14, R15
RES., OPT, 2512
OPT
17
0
R17, R108, R116, R127
RES., OPT, 1206
OPT
18
0
R25, R26, R27, R28, R30, R31, R32, R33,
R34, R35, R43, R106, R107, R119, R120,
R126, R138, R147
RES., OPT, 0603
OPT
19
1
R77
RES., CHIP, 0, 1/8W, 0805
VISHAY, CRCW08050000Z0EA
20
1
R102
RES., CHIP, 0Ω, 1225
TEPRO,RN5326
21
1
R115
RES., CHIP, 0, 1/4W, 1206
VISHAY, CRCW12060000Z0EA
22
0
R152
RES., OPT, 0805
OPT
23
0
U3
I.C. OPT, SO16
OPT
Hardware: For Demo Board Only
1
4
E1, E2, E3, E4
TESTPOINT, TURRET, .094"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
3
E5, E6, E7
TESTPOINT, TURRET, .061"
MILL-MAX, 2308-2-00-80-00-00-07-0
3
0
J1
HEADER, OPT, 2×7PIN, 0.079CC
OPT, MOLEX, 87331-1420
4
2
J3, J4
STUD, TEST PIN
PEM, KFH-032-10
5
4
J3, J4(2 EACH)
NUT, BRASS, #10-32
ANY #10-32
6
2
J3, J4
WASHER, STAR #10 BRASS NICKEL
ANY, #10EXT BZ TN
7
2
J3, J4
Ring, Lug Ring # 10
KEYSTONE, 8205
8
0
TP1-TP6
PAD-SMD
PAD-SMD
9
4
(STAND-OFF)
STAND-OFF, NYLON 0.25"
KEYSTONE, 8831 (SNAP ON)
10
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 2199A
dc2199aafa
8
A
B
C
D
R29
100K
0805
VIN
IS+
D27
ZHCS506
U1
R139
26.7K
UV
LTC3765EMSE
C118
1.5nF
R148
100
R76
4.22 0805
1.21K
0805
3
4
R84
2
1
T3
CT02-100
R117
12.7K
1/16W = 0402, 1/10W = 0603, 1/8W = 0805,
1/4W = 1206, 1W = 2512.
RCORE
SSFLT
RUN
VCC
R150
14.3K
11
13
12
3
C3,4,5,6
4x4.7uF
100V
1210
VIN
5
NOTE:
4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210)
4.7uF 25V AVX, 12063C475KAT2A (X7R 1206)
22uF 16V MURATA, GRM32ER71C226MEA8L (1210 X5R)
2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812)
150uF 16V PANASONIC, 16TQC150MYF
33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm)
L2 Vishay IHLP4040DZER2R0M11
L3 Coilcraft SER2915L-332KL
Unless otherwise specified:
0.005 ohm Susumu KRL6432D-M-R005-F-T5 (1225)
All resistors are in ohms 0603.
R110 SUSUMU, RL1632S-1R20-F (1206)
All capacitors are in microfarads 0603.
T1 Champs, LTC-PQ26-0402
All capacitors are 25V.
T2 Pulse, PA3493NL
PSS
VCP
Q28
FDC2512
D29
ZHCS506
2512
R1
0.33
C113
33nF
L2
2.0uH
C2
4.7uF
100V
1210
C24
1uF
16V
0805
SGNDP
C55
1nF
-VIN
2x33uF
80V
+ C1,22
R18
102K
0805
SGNDP
R22
3.74K
-VIN
36V-60VIN
+VIN
1
3
1
3
4
D30
ZHCS506
4
16
15
100
R151
R109
10K
C102
0.1uF
0805
R101
100
Q29
IRF6217
C101 0.1uF
220pF 0805
C72
250V
1812
C30
2.2nF
-VOUT
RS-
C66
47nF
200V
1206
4
1T
6
C11
15nF
D34
ES1PD
ND
T2
R110
1.20
1206
1/2W
3
1.25T
1
FG
R140
274
1/8W
0805
C112
0.22uF
200V
1210
1uF
16V
0805
C71
3
+VOUT
25
26
C73
1nF
PT-
PT+
28.7K
R118
681K
SGND
C10
2.2nF
630V
1206
D1
ES1PD
SGND PGND
R23,24
2x8.2
1206
R114
Q15 BSC028N06NS3
BSC028N06NS3
R51,52 Q14
2x3.0 Q24 OPT
1206
TRANS-PA3493NL
-VIN
SGNDP
R136
0.005
1225/2512
PGNDP
C106
150pF
250V
R53
6.8
1206
C69
1.5nF
630V
1206
12 13
6 5
C51
470pF
630V
1206
R121
133K
COG
0805
C78
33nF
R75
215
0805
FG
L3
3.3uH
1
C34
22uF
16V
1210
2
LTC3766EGN28
R123
118K
PGND
C77
4.7uF
1206
Q27
FCX491A
R69
46.4K
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
IS+
C75
100pF
SCALE = NONE
DAVID B.
LT
APPROVALS
R125
17.4K
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.
CUSTOMER NOTICE
U2
Q12 BSC028N06NS3
Q13 BSC028N06NS3
Q23 OPT
R4
8.2K
2512
Simplified Schematic (without Unneeded Components)
SGNDP
C119
1nF
C80
1nF
AG
IN-
IN+
R149
100
Q8 BSC190N15NS3
Q9 BSC190N15NS3
Q11 OPT
SGND
ND
9 10
32
14
T1
LTCP26-0402
8
3
2
1
L1
14
NDRV
PGND
1
GND
17
FS/UV
10
GND2
9
2
PG
8
IS+
DELAY
6
7
ISISMAG
5
23
1.0uH
1
3
20
FGD/SWB
RUN
8
3
VSEC
SS
9
SW
2
14
REGSD
16
FG
GND
1
SG
24
PHASE
5
IPK
10
2
3
28
4
4
PGND
27
VAUX
22
VIN
21
NDRV
MODE
VCC
FS/SYNC
15
SGD
19
17
IS-
18
IS+
ITH
7
VSOUT
11
5
C70
6
13
12
DATE:
N/A
SIZE
DATE
1
SHEET 1
LTC3765EMSE / LTC3766EGN28
DC2199A
OF 2
REV.
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
8-18-14
ACTIVE CLAMP FORWARD CONVERTER
WITH DIRECT FLUX LIMIT
Friday, October 31, 2014
IC NO.
R42
1K
C76
3.3nF
-VOUT
12VOUT / 30A
TECHNOLOGY
SGND
R46
604
R41
11.5K
+VOUT
-VOUT
4x150uF
16V
7343
+ C7,31,33,68
+VOUT
DAVID B.
+VOUT
APPROVED
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
TITLE: SCHEMATIC
C79
4.7nF
R68
2.15K
FB
VS-
VS+
3.3nF SGND
__
ECO
A
B
C
D
DEMO MANUAL DC2199A-A
SCHEMATIC DIAGRAM
dc2199aafa
9
A
B
C
D
1
D40
SGNDP
R22
3.74K
2
33uF
80V
+ C22
R18
102K
0805
-VIN
33uF
80V
+ C1
1N4148WS
E7
E2
E1
PSS
VCP
3
C24
1uF
16V
0805
SGNDP
C55
1nF
C113
33nF
C6
4.7uF
100V
1210
Q28
FDC2512
D29
ZHCS506
C2
4.7uF
100V
1210
L2
2.0uH
C4
4.7uF
100V
1210
R29
100K
0805
VIN
IS+
D27
ZHCS506
1210
C5
4.7uF
100V
R139
26.7K
UV
5
1
C118
1.5nF
R148
100
R117
12.7K
4
AG
IN-
IN+
4
16
15
4
FG
AS
R109
10K
C102
0.1uF
0805
AG1
R8
0
AG
SGNDP
C119
1nF
D30
ZHCS506
C80
1nF
AS
1
SGND
Q3
OPT
Q8 BSC190N15NS3
Q9 BSC190N15NS3
Q11 OPT
R149
100
R9
0
R76
4.22 0805
D28
OPT
1.21K
0805
3
4
R84
2
1
LTC3765EMSE
U1
0
R49
3
OPT
2512
T3
CT02-100
1/16W = 0402, 1/10W = 0603, 1/8W = 0805,
1/4W = 1206, 1W = 2512.
RCORE
SSFLT
RUN
VCC
R150
14.3K
11
13
12
3
C3
4.7uF
100V
1210
VIN
NOTE:
4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210)
4.7uF 25V AVX, 12063C475KAT2A (X7R 1206)
22uF 16V MURATA, GRM32ER71C226MEA8L (1210 X5R)
2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812)
150uF 16V PANASONIC, 16TQC150MYF
33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm)
L2 Vishay IHLP4040DZER2R0M11
L3 Coilcraft SER2915L-332KL
Unless otherwise specified:
0.005 ohm Susumu KRL6432D-M-R005-F-T5 (1225)
All resistors are in ohms 0603.
R110 SUSUMU, RL1632S-1R20-F (1206)
All capacitors are in microfarads 0603.
T1 Champs, LTC-PQ26-0402
All capacitors are 25V.
T2 Pulse, PA3493NL
RUN
-VIN
36V-60VIN
+VIN
2512
1
3
R10
3
2
1.0uH
1
3
6
5
2
1
4
C72
-VIN
R151
ND
C11
15nF
D34
ES1PD
C66
47nF
200V
1206
4
1T
6
1uF
16V
0805
C71
FG
SW
C51
470pF
630V
1206
R140
274
1/8W
0805
3
C112
0.22uF
200V
1210 +VOUT
PT-
25
26
R114
C73
1nF
RUN
PT-
PT+
28.7K
R118
681K
SGND
OPT 1206
R108
R23
R121
133K
SSS
R111
0
PGND
C10
2.2nF
630V
1206
C78
33nF
COG
0805
R112
0
R77
0
0805
FG
321
8765
R75
215
0805
D1
ES1PD
8.2 1206
8.2 1206
R24
R146
0
SGND
4
RS- R102 RS+
321
Q15 BSC028N06NS3
0
Q14 BSC028N06NS3 1225
Q24 OPT
8765
-VOUT
RS-
R52
3.0
1206
SWB
PGND
VA
Full Schematic, Page 1
R110
1.20
1206
1/2W
Q31
OPT
4
Q29
IRF6217
3
1.25T
1
T2
1
AG1
AG
R101
100
250V
1812
C30
2.2nF
R51
3.0
1206
C69
1.5nF
630V
1206
OPT
R3
R2
OPT
TRANS-PA3493NL
SGNDP
C101 0.1uF
220pF 0805
100
C106
150pF
200V
R136
0.005
1225/2512
PGNDP
123
R53
6.8
1206
12 13
6 5
5678
ND
9 10
32
14
T1
LTCP26-0402
8
2
1
R1
0.33
GND
17
PGND
1
FS/UV
10
GND2
9
14
NDRV
2
PG
8
IS+
DELAY
6
2
7
ISISMAG
5
C8
OPT
VAUX
R138
OPT
PGND OPT
R147
OPT
0
LTC3766EGN
R122
0
R123
118K
OPT
1206
R116
1
R124
0
R43
OPT
VCC
C34
22uF
16V
1210
0603
0
R113
VCC
R69
46.4K
SYNC
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
150uF
16V
7343
+ C33
OPT
C103
R125
17.4K
SCALE = NONE
DAVID B.
LT
APPROVALS
ITH-
C75
100pF
ITH
IS+
R126
OPT
C77
4.7uF
1206
DATE:
N/A
SIZE
SGND
C9
OPT
R42
1K
DATE
10-29-14
1
SHEET 1
LTC3765EMSE / LTC3766EGN
DC2199A
2
OF 2
REV.
ACTIVE CLAMP FORWARD CONVERTER
WITH DIRECT FLUX LIMIT
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
R46
604
R41
11.5K
C76
3.3nF
-SENSE
+SENSE
-
-VOUT
12VOUT / 30A
+VOUT
+
Wednesday, October 29, 2014
IC NO.
R127
OPT
1/4W
1206
R115
0
1/4W
1206
C74
0
+VOUT
E6
E5
E4
J4
150uF
16V
7343
+ C68
TECHNOLOGY
PGND
VCC
VS-
TITLE: SCHEMATIC
C79
4.7nF
OPT
OPT
R120
R119
6
13
12
R68
2.15K
FB
VS-
VS+
VS+
-VOUT
OPT
C23
C25
+ C26
J3
E3
DAVID B.
+VOUT
APPROVED
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
150uF
16V
7343
+ C7
__
ECO
3.3nF SGND
C70
R107
OPT
VCC
150uF
16V
7343
+ C31
RS+
R106
OPT
R7 RS0
Q27
FCX491A
VPK
R5
OPT
2512
CUSTOMER NOTICE
U2
RUN
C111
0603
R6
0
R137
R4
8.2K
2512
2
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.
C105
0
R103
0
4
CLAMP
L3
3.3uH
Q12 BSC028N06NS3
Q13 BSC028N06NS3
Q23 OPT
-VOUT
1
L1
3
2
20
FGD/SWB
RUN
8
3
VSEC
SS
9
23
16
2
3
28
3
5
SW
REGSD
24
VAUX
PHASE
FG
GND
14
22
VIN
IPK
10
SG
PGND
27
21
NDRV
MODE
4
VCC
FS/SYNC
15
17
4
1
3
5
6
7
8
1
2
3
SGD
19
ISITH
18
IS+
VSOUT
7
10
11
5
A
B
C
D
DEMO MANUAL DC2199A-A
SCHEMATIC DIAGRAM
dc2199aafa
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
5
AG
C18
OPT
PGNDP
AG
CRX
5
2
Q2
OPT
PGNDP
3
4
6
1
VCCP
Q1
4
AG1
OPT
C19
7
Q1
3
4
6
1
ZXGD3002E6
5
2
PGNDP
AG1
C16
56pF
C14
0.1uF
VCC
C15
0.1uF
0805
C20
0.1uF
ACTIVE SNUBBER
D2
OPT
RS-
OPTIONAL CIRCUITS
SO16
U3
HEF4528BT
AC DRIVER
C13
10pF
2
R12
4.99K
47pF
C12
FG
5
R11
1.00K
4
A1
VSS
1
16
VDD
3
B1
RES
VSS1
8
2
1
VSS2
15
4
RS-
+VOUT
2
R14
6.8
2512
R15
6.8
2512
OPT
D4
R17
100K
1206
Q4
FQD4P25
6.8
2512
R13
C17
15nF
200V
1206
1
SW
3
CLAMP
C21
OPT
0805
VA
Full Schematic, page 2
R19
1.5K
SW
3
VA
R31 OPT
VS-
1
3
PGND
C116
OPT
1206
2
OPT
D35
1
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C114
OPT
0805
PGND
VPK
SCALE = NONE
DAVID B.
LT
APPROVALS
OPT
0805
R152
PEAK CHARGE VCC
R33 OPT
SYNC
VA
R32 OPT
R28 OPT
VS+
PT-
CUSTOMER NOTICE
D38
OPT
OPT
SYNC
PT-
VS+
ITH
R27 OPT
OPT
R34
OPT
R25
ITH
PSS
SGNDP
2
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.
OPT
D37
VAUX
R30 OPT
ITH-
L4
R35 OPT
R26 OPT
PSS
SGNDP
SSS
VCC FROM T1
VS-
ITH-
SSS
SGND
3
1
D
5
14
13
12
11
10
9
8
7
6
5
4
3
2
1
DATE:
N/A
SIZE
1
SHEET 2
LTC3765EMSE / LTC3766EGN
DC2199A
2
OF 2
REV.
ACTIVE CLAMP FORWARD CONVERTER
WITH DIRECT FLUX LIMIT
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Wednesday, October 29, 2014
IC NO.
TITLE: SCHEMATIC
OPT
HD2X7-MOLEX
14
13
12
11
10
9
8
7
6
5
4
3
2
1
J1
1
A
B
C
D
DEMO MANUAL DC2199A-A
SCHEMATIC DIAGRAM
dc2199aafa
11
DEMO MANUAL DC2199A-A
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
dc2199aafa
12 Linear Technology Corporation
LT 1114 REV A • 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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