DC2199A-B - Demo Manual

DEMO MANUAL DC2199A-B
LTC3765/LTC3766
360W Isolated Forward Converter
with Synchronous Rectification
DESCRIPTION
Demonstration circuit 2199A-B is a 360W isolated forward
converter with synchronous rectification featuring the
LTC3765/LTC3766 chip-set. It produces a regulated 24V,
15A 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 efficiency
PERFORMANCE SUMMARY
approaching 96%. Secondary-side control eliminates
complex opto-coupler feedback, providing fast transient
response with minimum output capacitance. For other
output requirements, see the LTC3765 and LTC3766 data
sheets or contact the LTC sales.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2199A-B
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 = 48V, IOUT = 30A (20MHz BW)
IREG
Output Regulation
Line and Load (36VIN to 60VIN, 0AOUT to 15AOUT)
POUT/PIN
CONDITIONS
MIN
TYP
36
MAX
60
24.0
300LFM
Efficiency (See Figure 3)
VIN =48V, IOUT = 15A
Isolation
Basic
Approximate Solution Size
Component Area × Top Component Height
0
UNITS
V
V
15
A
200
kHz
60
mVP-P
±0.02
96
1500
4.7in2 × 0.6
%
%
VDC
Inches
dc2199abf
1
DEMO MANUAL DC2199A-B
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-B 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-B’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 300LFM 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 24V. Turn off
the power at the input.
6.Once the proper output voltages are established, connect a variable load capable of sinking 15A 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 15ADC
can be put in series with the output load in order to
measure the DC2199A-A’s output current.
dc2199abf
2
DEMO MANUAL DC2199A-B
QUICK START PROCEDURE
b.A voltmeter with a capability of measuring at least 24V
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
1
3
5
7
9
IOUT (A)
11
13
15
6
POWER DISSIPATION (W)
EFFICIENCY (%)
Figure 1. Proper Measurement Equipment Setup
4
2
dc2199ab F02
Figure 2. Efficiency and Power Dissipation
dc2199abf
3
DEMO MANUAL DC2199A-B
QUICK START PROCEDURE
Figure 3. Output Ripple at 48VIN and 15AOUT (100mV, 2µs/DIV, 20MHz)
Figure 4. Transient Response Waveform at 48VIN and 7.5A to 15A to 7.5AOUT (5A, 500mV, 500µs/DIV)
dc2199abf
4
DEMO MANUAL DC2199A-B
QUICK START PROCEDURE
Figure 5. Thermal Map, Front Side at 48VIN and 15AOUT (TA = 25°C, 300LFM)
Figure 6. Thermal Map, Back Side at 48VIN and 15AOUT (TA = 25°C, 300LFM)
dc2199abf
5
DEMO MANUAL DC2199A-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
C1, C22
CAP., ALUM., ELECT., 33µF, 80V, CAP-10X12.5
PANASONIC, EEHZA1K330P
2
5
C2, C3, C4, C5, C6
CAP., X7R, 4.7µF, 100V, 10%, 1210
MURATA, GRM32ER72A475KE14
4
1
C10
CAP., X7R, 2.2nF, 630V, 5%, 1206
MURATA, GRM31A7U2J222JW31
5
1
C11
CAP., X7R, 0.015µF, 25V, 10%, 0603
AVX, 06033C153KAT2A
7
2
C24, C71
CAP., X7R, 1.0µF, 16V 10%, 0805
MURATA, GRM21BR71C105KA01
4
2
C25, C26
CAP., OSCON, 82µF, 35V, 20%, CAP-SVPF-E12
PANASONIC, 35SVPF82M
8
1
C30
CAP., X7R, 2200pF, 250V, 10%, 1812
MURATA, GA343QR7GD222KW01L
8
1
C34
CAP., X5R, 10µF, 50V, 20%, 1210
MURATA, GRM32ER61H106MA12
9
1
C51
CAP., C0G, 330pF, 630V, 5%, 1206
MURATA, GRM31A5C2J331JW01
12
4
C55, C73, C80, C119
CAP., X7R, 1nF, 25V, 10%, 0603
MURATA, GRM188R71E102KA01
9
1
C66
CAP., X7R, 0.047µF, 200V, X7R, 10%, 1206
MURATA, GRM31CR72D473KW03
11
2
C72, C102
CAP., X7R, 0.1µF, 25V, 10%, 0805
AVX, 08053C104KAT2A
14
1
C75
CAP., NPO, 100pF, 25V, 5%, 0603
AVX, 06033A101JAT2A
10
1
C76
CAP., X7R, 3.3nF, 25V, 10%, 0603
AVX, 06033C332KAT2A
15
1
C77
CAP., X7R, 4.7µF, 25V, 10%, 1206
AVX, 12063C475KAT2A
16
1
C78
CAP., NPO, 0.033µF, 25V, 5%, 0805
TDK, C2012C0G1E333J
17
1
C79
CAP., X7R, 4.7nF, 25V, 10%, 0603
MURATA, GRM188R71E472KA01
18
1
C101
CAP., NPO, 220pF, 25V, 5%, 0603
AVX, 06033A221JAT2A
10
1
C103
CAP., NPO, 470pF, 25V, 5%, 0603
AVX, 06033A471JAT2A
19
1
C106
CAP., COG, 150pF, 250V, 5%, 0603
TDK, C1608C0G2E151J080AA
20
1
C112
CAP., X7R, 0.22µF, 250V, 10%, 1206/1210
TDK C3225X7R2E224K
21
1
C113
CAP., X7R, 0.033µF, 25V, 10%, 0603
AVX, 06033C333KAT2A
11
1
C116
CAP., X7R, 4.7µF, 25V, 10%, 1206
AVX, 12063C475KAT2A
22
1
C118
CAP., NPO, 1500pF, 5%, 0603
AVX, 06033A152JAT2A
23
2
D1, D34
DIODE ULTRA FAST 1A 200V SMP
VISHAY, ES1PD-M3 / 84A
25
3
D29, D30
DIODE SCHOTTKY 60V 0.5A, SOT23
DIODES INC, ZHCS506TA
27
1
D40
DIODE, 1N4148WS, SOD323
VISHAY, 1N4148WS-E3-08
14
2
D37, D38
DIODE, BAS21, SOT23
DIODES INC., BAS21
15
1
L3
INDUCTOR, 6.8µH, 10%
COILCRAFT, SER2915L-682KL
16
1
L4
INDUCTOR, 680µH, DO1606T
COILTRONICS SD25-681
19
4
Q12, Q13, Q14, Q15
MOSFET, N-CH, 120V, POWERPAK-SO-8
FAIRCHILD FDMS86201
35
1
L1
INDUCTOR, 1.0µH, 20%
COILCRAFT, XPL2010-102ML
36
1
L2
INDUCTOR, 2.0µH, 20%
VISHAY, IHLP4040DZER2R0M11
40
2
Q8, Q9
MOSFET, N-CH 150V, POWERPAK-SO-8
INFINEON, BSC190N15NS3 G
42
1
Q27
TRANS., NPN, 40V, 1A, SOT-89
DIODE INC., FCX491ATA
43
1
Q28
MOSFET, N-CH, SUPER, SOT-6
FAIRCHILD, FDC2512-NL
44
1
Q29
MOSFET, P-CH, IRF6217, POWERPAK-SO-8
IR, IRF6217TRPBF
45
1
R1
RES., CHIP, 0.33Ω, 1/4W, 5%, 2512
PANASONIC, ERJ-1TRQJR33U
47
1
R4
RES., CHIP, 8.2k, 1W, 5%, 2512
PANASONIC, ERJ-1TYJ822U
51
1
R18
RES., 102k, 1/8W, 1%, 0805
VISHAY, CRCW0805102KFKEA
52
1
R22
RES., 3.74k, 1/16W, 1%, 0603
VISHAY, CRCW06033K74FKEA
dc2199abf
6
DEMO MANUAL DC2199A-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
27
2
R23, R24
RES., CHIP, 20Ω, 1/4W, 5%, 1206
VISHAY, CRCW120620R0JKEA
54
1
R29
RES., CHIP, 100k, 1/8W, 5%, 0805
VISHAY, CRCW0805100KJNEA
28
1
R41
RES., CHIP, 23.7k, 1/16W, 1%, 0603
VISHAY, CRCW060323K7FKEA
55
1
R42
RES., CHIP, 1k, 1/16W, 1%, 0603
VISHAY, CRCW06031K00FKEA
56
1
R46
RES., CHIP, 604Ω, 1/16W, 1%, 0603
VISHAY, CRCW0603604RFKEA
57
1
R53
RES., CHIP, 6.8Ω, 1/2W, 1%, 1206
PANASONIC, ERJ-8RQF6R8V
58
1
R68
RES., CHIP, 2.15k, 1/16W, 1%, 0603
VISHAY, CRCW06032K15FKEA
59
1
R69
RES., CHIP, 46.4k, 1/16W, 1%, 0603
VISHAY, CRCW060346K4FKEA
29
1
R75
RES., CHIP, 2.87k, 1/8W, 1%, 0805
VISHAY, CRCW08052K87FKEA
60
4
R101, R148, R149, R151
RES., CHIP, 100Ω, 1/16W, 1%, 0603
VISHAY, CRCW0603100RFKEA
32
1
R102
RES., CHIP, 0.003Ω, 3W, 1%, 1225
SUSUMU, KRL6432D-M-R003-F-T5
33
2
R106, R107
RES., CHIP, 100Ω, 1/16W, 1%, 0603
VISHAY, CRCW0603100RFKEA
34
1
R108
RES., CHIP, 5.62k, 1/4W, 1%, 1206
VISHAY, CRCW12065K62FKEA
61
1
R109
RES., CHIP, 10k, 1/16W, 1%, 0603
VISHAY, CRCW060310K0FKEA
62
1
R110
RES., CHIP, 1.20Ω, 1/2W, 1%, 1206
SUSUMU, RL1632S-1R20-F
63
1
R114
RES., CHIP, 28.7k, 1/16W, 1%, 0603
VISHAY, CRCW060328K7FKEA
35
1
R115
RES., CHIP, 4.42k, 1/4W, 1%, 1206
VISHAY, CRCW12064K42FKEA
64
1
R117
RES., CHIP, 12.7k, 1/16W, 1%, 0603
VISHAY, CRCW060312K7FKEA
65
1
R118
RES., CHIP, 681k, 1/16W, 1%, 0603
VISHAY, CRCW0603681KFKEA
66
1
R121
RES., CHIP, 133k, 1/16W, 1%, 0603
VISHAY, CRCW0603133KFKEA
36
1
R123
RES., CHIP, 86.6k, 1/16W, 1%, 0603
VISHAY, CRCW060386K6FKEA
67
1
R125
RES., CHIP, 17.4k, 1/16W, 1%, 0603
VISHAY, CRCW060317K4FKEA
37
1
R127
RES., CHIP, 10k, 1/4W, 1%, 1206
VISHAY, CRCW120610K0FKEA
68
1
R136
RES., CHIP, 0.005Ω, 1W, 1%, 1225
SUSUMU, KRL6432D-M-R005-F-T5
69
1
R139
RES., CHIP, 26.7k, 1/16W, 1%, 0603
VISHAY, CRCW060326K7FKEA
70
1
R140
RES., CHIP, 274Ω, 1/8W, 1%, 0805
PANASONIC, ERJ-6ENF2740V
71
1
R150
RES., CHIP, 14.3k, 1/16W, 1%, 0603
VISHAY, CRCW060314K3FKEA
38
1
T1
TRANSFORMER, 4T:4T:2T
CHAMPS TECH., LTC-PQ26-0404-S02
73
1
T2
TRANSFORMER, 1.25:1
PULSE, PA3493NL
74
1
U1
I.C. LTC3765EMSE, MSOP-16PIN
LINEAR TECH., LTC3765EMSE#PBF
75
1
U2
I.C. LTC3766EGN, SSOP-GN28
LINEAR TECH., LTC3766EGN#PBF
Additional Demo Board Circuit Components
2
0
C7, C31, C33, C68
CAP., OPT, 7343
OPT
3
0
C8, C9, C18, C19, C111
CAP., OPT, 0603
OPT
5
0
C12, C13, C14, C16, C20, C70
CAP., OPT, 0603
OPT
6
0
C15
CAP., OPT, 0805
OPT
7
0
C17, C69
CAP., OPT, 1206
OPT
6
0
C21, C114
CAP., OPT, 0805
OPT
3
0
C23
CAP., OPT, CAP-SVPF-E12
OPT
13
2
C74, C105
CAP, 0Ω, JUMPER, 0603
VISHAY, CRCW06030000Z0EA
12
0
D2
DIODE, TBD, SOD323
OPT
24
0
D4, D35
DIODE, OPT, SOD323
OPT
dc2199abf
7
DEMO MANUAL DC2199A-B
PARTS LIST
ITEM
QTY
13
0
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
D27
DIODE OPT, SOT23
OPT
26
0
D28
DIODE, OPT, SOT23
OPT
17
0
Q1
MOSFET, OPT, SOT23-6
OPT
18
0
Q4
MOSFET, OPT, D-PAK
OPT
20
0
Q23
MOSFET, OPT, POWERPAK-SO-8
OPT
21
0
Q24
MOSFET, OPT, POWERPAK-SO-8
OPT
37
0
Q2
MOSFET, OPT, SOT23-6
OPT
38
0
Q3
MOSFET, OPT, SOT23
OPT
39
0
Q31
TRANS, OPT, SOT23
OPT
41
0
Q11
MOSFET, OPT, POWERPAK-SO-8
OPT
22
3
R2, R3, R43
RES., CHIP, 0Ω, 0603
VISHAY, CRCW06030000Z0EA
48
0
R5
RES., OPT, 2512/2010
OPT
23
0
R6, R9, R11, R12, R19, R113, R124
RES., OPT, 0603
OPT
49
9
R7, R8, R49, R103, R111, R112
RES., CHIP, 0Ω, 0603
VISHAY, CRCW06030000Z0EA
24
1
R10
RES., CHIP, 0.00Ω, 1225
TEPRO, RN5326
25
0
R13, R14, R15
RES., OPT, 2512
OPT
26
0
R17, R51, R52
RES., OPT, 1206
OPT
46
0
R25, R26, R27, R28, R30, R31, R32, R33,
R34, R35, R119, R120, R126, R138, R147
RES., OPT, 0603
OPT
R76, R84
RES., OPT, 0805
OPT
50
30
R122, R137, R146
0
31
1
R77
RES., CHIP, 0Ω, 1/8W, 0805
VISHAY, CRCW08050000Z0EA
53
0
R116
RES., OPT, 1206
OPT
72
0
R152
RES., OPT, 0805
OPT
39
0
T3
TRANSFORMER, 1:100, CT02-100
OPT
40
0
U3
I.C. OPT, SO16
OPT
Hardware: For Demo Board Only
1
4
E1, E2, E3, E4
TESTPOINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
3
E5, E6, E7
TESTPOINT, TURRET, 0.061"
MILL-MAX, 2308-2-00-80-00-00-07-0
3
0
J1
HEADER, OPT, 2X7PIN, 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
dc2199abf
8
A
B
C
D
3
R29
100K
0805
VIN
U1
C118
1.5nF
R148
100
R139
26.7K
UV
LTC3765EMSE
1/4W = 1206, 1W = 2512.
RCORE
SSFLT
RUN
VCC
R150
14.3K
11
13
12
C3,4,5,6
4x4.7uF
100V
1210
VIN
R117
12.7K
5
NOTE:
4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210)
4.7uF 25V AVX, 12063C475KAT2A (X7R 1206)
10uF 50V MURATA, GRM32ER61H106MA12 (1210 X5R)
2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812)
82uF 16V PANASONIC, 35SVPF82M
33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm)
L1 Coilcraft XPL2010-102ML
L2 Vishay IHLP4040DZER2R0M11
L3 Coilcraft SER2915L-682KL
Unless otherwise specified:
L4 Coiltronics SD25-681
All resistors are in ohms 0603.
0.005 Ohm Susumu KRL6432D-M-R005-F-T5 (1225)
0.003 Ohm Susumu KRL6432D-M-R003-F-T5 (1225)
All capacitors are in microfarads 0603.
R110 SUSUMU, RL1632S-1R20-F (1206)
All capacitors are 25V.
T1 Champs, LTC-PQ26-0404-S02
1/16W = 0402, 1/10W = 0603, 1/8W = 0805,
T2 Pulse, PA3493NL
PSS
VCP
Q28
FDC2512
D29
ZHCS506
2512
C113
33nF
L2
2.0uH
C2
4.7uF
100V
1210
1.0uH
C24
1uF
16V
0805
SGNDP
C55
1nF
-VIN
2x33uF
80V
+ C1,22
R18
102K
0805
SGNDP
R22
3.74K
-VIN
36V-60VIN
+VIN
R1
0.33
4
D30
C106
150pF
250V
R53
6.8
1206
R109
10K
C102
0.1uF
0805
R101
100
Q29
IRF6217
C101 0.1uF
220pF 0805
4
1T
6
-VOUT
C66
47nF
200V
1206
C11
15nF
D34
ES1PD
ND
L4
RS-
R140
274
1/8W
0805
3
R108
C73
1nF
PT-
PT+
28.7K
R114
R118
681K
25
26
C10
2.2nF
630V
1206
D1
ES1PD
SGND PGND
R23,24
2x20
1206
5.62K 1206
RS+
SGND
0.003
1225
R102
C51
330pF
630V
1206
PGND
C116
4.7uF
25V
1206
VAUX
+VOUT
FG
680uH
D38
BAS21
C112
0.22uF
200V
1210
1uF
16V
0805
C71
Q14,15
FDMS86201
PA3493NL
T2
R110
1.20
1206
1/2W
3
1
250V
1812
C30
2.2nF
12 13
1.25T
-VIN
SGNDP
PGNDP
C72
R136
0.005
1225
6 5
4T
9 10
BAS21
D37
R121
133K
COG
0805
C78
33nF
FG
R75
2.87K
0805
VAUX
C34
10uF
50V
1210
2
LTC3766EGN28
R123
86.6K
VCC
PGND
C77
4.7uF
1206
VCC
Q27
FCX491A
R69
46.4K
RS-
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C103
470pF
C75
100pF
LT
SCALE = NONE
DAVID B.
6
13
12
__
R127
10K
1206
DATE:
N/A
SIZE
DATE
1
SHEET 1
LTC3765EMSE / LTC3766EGN28
DC2199A-B
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
TECHNOLOGY
R42
1K
C76
3.3nF
-VOUT
24VOUT / 15A
Friday, December 12, 2014
IC NO.
R46
604
R41
23.7K
SGND
R115
4.42K
1206
+VOUT
-VOUT
2x82uF
35V
+VOUT
DAVID B.
+VOUT
APPROVED
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
+ C25,26
ECO
TITLE: SCHEMATIC
C79
4.7nF
R68
2.15K
FB
VS-
VS+
R107
100
RS+
R106
100
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
R4
8.2K
2512
Q12,13
FDMS86201
L3
6.8uH
Simplified Schematic (without Unneeded Components)
100
R151
ZHCS506
4
16
15
SGNDP
C119
1nF
C80
1nF
AG
IN-
IN+
R149
100
Q8,9
BSC190N15NS3
ND
4T
32
T1
LTCP26-0404-S02
8
2T
14
23
3
28
L1
GND
17
PGND
1
FS/UV
10
GND2
9
14
NDRV
2
PG
8
IS+
DELAY
6
7
ISISMAG
5
20
FGD/SWB
RUN
8
3
VSEC
SS
9
SW
2
14
REGSD
16
FG
GND
1
SG
24
VAUX
PHASE
5
IPK
10
4
4
PGND
27
22
VIN
21
NDRV
MODE
VCC
FS/SYNC
15
SGD
19
17
IS-
18
IS+
ITH
7
VSOUT
11
5
A
B
C
D
DEMO MANUAL DC2199A-B
SCHEMATIC DIAGRAM
dc2199abf
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
C5
4.7uF
100V
1210
IS+
D27
OPT
U1
0
R49
3
R139
26.7K
UV
0
2512
1
5
R9
OPT
C118
1.5nF
R148
100
R76
OPT 0805
D28
OPT
OPT
0805
3
4
R84
2
1
T3
OPT
LTC3765EMSE
1/4W = 1206, 1W = 2512.
RCORE
SSFLT
RUN
VCC
R150
14.3K
11
13
12
3
C3
4.7uF
100V
1210
VIN
R117
12.7K
NOTE:
4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210)
4.7uF 25V AVX, 12063C475KAT2A (X7R 1206)
10uF 50V MURATA, GRM32ER61H106MA12 (1210 X5R)
2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812)
82uF 16V PANASONIC, 35SVPF82M
33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm)
L1 Coilcraft XPL2010-102ML
L2 Vishay IHLP4040DZER2R0M11
L3 Coilcraft SER2915L-682KL
L4 Coiltronics SD25-681
Unless otherwise specified:
0.005 Ohm Susumu KRL6432D-M-R005-F-T5 (1225)
All resistors are in ohms 0603.
0.003 Ohm Susumu KRL6432D-M-R003-F-T5 (1225)
All capacitors are in microfarads 0603.
R110 SUSUMU, RL1632S-1R20-F (1206)
All capacitors are 25V.
T1 Champs, LTC-PQ26-0404-S02
1/16W = 0402, 1/10W = 0603, 1/8W = 0805,
T2 Pulse, PA3493NL
RUN
-VIN
36V-60VIN
+VIN
2512
1
3
R10
1
SGND
Q3
OPT
4
FG
AG
IN-
IN+
R149
100
AS
R109
10K
C102
0.1uF
0805
AG1
R8
0
AG
SGNDP
C119
1nF
D30
ZHCS506
4
16
15
Q8 BSC190N15NS3
Q9 BSC190N15NS3
Q11 OPT
C80
1nF
AS
4
3
2
C72
-VIN
R151
ND
R52
OPT
1206
SWB
C11
15nF
D34
ES1PD
C66
47nF
200V
1206
4
1T
6
3
1uF
16V
0805
C71
R140
274
1/8W
0805
3
C112
0.22uF
200V
1210 +VOUT
PT-
25
26
C73
1nF
RUN
PT-
PT+
28.7K
R114
5.11K 1206
C10
2.2nF
630V
1206
R121
133K
SSS
R111
0
C78
33nF
COG
0805
FG
R112
0
R77
0
0805
R75
2.61K
0805
321
8765
C51
330pF
630V
1206
D1
ES1PD
SW
PGND
R146
0
SGND
3M
1225
R108
R118
681K
SGND
PGND
C116
4.7uF
25V
1206
VAUX
RS- R102 RS+
D38
BAS21
FG
4
L4
680uH
321
Q15 FDMS86201
Q14 FDMS86201
Q24 OPT
8765
D37
BAS21
-VOUT
RS-
R3
0
1
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
OPT
1206
C69
OPT
1206
12 13
4T
9 10
R2
0
TRANS-PA3493NL
SGNDP
C101 0.1uF
220pF 0805
100
C106
150pF
200V
R53
6.8
1206
R136
0.005
1225/2512
PGNDP
123
5678
ND
6 5
4T
32
T1
LTCP26-0404-S02
8
2T
14
3
1
1.0uH
1
3
6
5
2
1
4
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
R103
0
4
VAUX
R138
OPT
PGND OPT
R147
OPT
0
LTC3766EGN
R122
0
R123
86.6K
OPT
1206
R116
R124
OPT
R43
0
VCC
C34
10uF
50V
1210
0603
OPT
R113
VCC
R69
46.4K
SYNC
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
OPT
7343
+ C33
C103
470pF
R125
17.4K
SCALE = NONE
DAVID B.
LT
APPROVALS
ITH-
C75
100pF
ITH
SGND
IS+
R126
OPT
DATE:
N/A
SIZE
-VOUT
C77
4.7uF
1206
R127
10K
1/4W
1206
R115
4.42K
1/4W
1206
C74
0
SGND
C9
OPT
DATE
12-01-14
Monday, December 01, 2014
1
SHEET 1
LTC3765EMSE / LTC3766EGN
DC2199A-B
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
R42
1K
C76
3.3nF
-SENSE
+SENSE
-
-VOUT
24VOUT / 15A
+VOUT
+
R41
23.7K
+VOUT
E6
E5
E4
J4
OPT
7343
+ C68
TECHNOLOGY
PGND
VCC
VS-
IC NO.
C23
C25
82uF
35V
+ C26
J3
E3
DAVID B.
+VOUT
APPROVED
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
TITLE: SCHEMATIC
C79
4.7nF
OPT
OPT
R120
R119
6
13
VS+
OPT
7343
__
ECO
+ C7
12
R68
2.15K
FB
VS-
VS+
OPT
C70
R107
100
VCC
OPT
7343
+ C31
RS+
R106
100
R7 RS0
Q27
FCX491A
VPK
R5
OPT
2512
1
R137
R4
8.2K
2512
CUSTOMER NOTICE
U2
RUN
C111
0603
R6
OPT
Q12 FDMS86201
Q13 FDMS86201
Q23 OPT
CLAMP
L3
6.8uH
-VOUT
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
1206
R24
R23
20 1206
20
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-B
SCHEMATIC DIAGRAM
dc2199abf
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
VCCP
Q1
PGNDP
3
4
6
1
4
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
VSS2
15
2
1
D
5
RS-
+VOUT
2
R14
6.8
2512
R15
6.8
2512
OPT
D4
R17
100K
1206
Q4
FQD4P25
R13
6.8
2512
C17
15nF
200V
1206
1
SW
3
CLAMP
C21
OPT
0805
VA
Full Schematic, page 2
R19
1.5K
SW
3
R31 OPT
VS-
SYNC
PT-
VS+
ITH
VA
2
OPT
D35
1
OPT
0805
R152
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PGND
SCALE = NONE
DAVID B.
LT
APPROVALS
C114
OPT
0805
VPK
PEAK CHARGE VCC
R33 OPT
SYNC
R28 OPT
R27 OPT
R32 OPT
VS+
ITH
OPT
R34
OPT
R25
PT-
CUSTOMER NOTICE
R30 OPT
R35 OPT
ITH-
SSS
R26 OPT
PSS
SGNDP
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.
VS-
ITH-
SSS
SGND
PSS
SGNDP
2
14
13
12
11
10
9
8
7
6
5
4
3
2
1
DATE:
N/A
SIZE
1
SHEET 2
LTC3765EMSE / LTC3766EGN
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
ACTIVE CLAMP FORWARD CONVERTER
WITH DIRECT FLUX LIMIT
TECHNOLOGY
Monday, December 01, 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-B
SCHEMATIC DIAGRAM
dc2199abf
11
DEMO MANUAL DC2199A-B
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
dc2199abf
12 Linear Technology Corporation
LT 0215 • 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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