DC607A - Demo Manual

DEMO MANUAL DC607A
LTC3722, LTC4440, LTC3901,
and LT1431
Isolated Full Bridge Converter
DESCRIPTION
Demonstration circuit 607A is an isolated full bridge
converter featuring the LTC3722, LTC4440, LTC3901,
and LT1431. This circuit was designed to demonstrate the
phase-shifted full bridge power supply to generate 12V
at 35A from a typical telecom input voltage range of 36V
to 72V. Isolation voltage is 1500VDC. Fixed zero-voltage
transition timing was chosen because of the relatively fast
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Output Current Range
fSW
Switching (Clock) Frequency
VOUT(P-P)
Output Ripple
bridge leg transition times with a 48V input. The DC607A
PCB layout includes options to implement adaptive timing.
Design files for this circuit board are available at
http://www.linear.com/demo/DC607A
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
36
MAX
72
12.0
200LFM
0
VIN = 48V, IOUT = 35A (20MHz BW)
UNITS
V
V
35
A
200
kHz
200
mVP-P
IREG
Output Regulation
Line and Load (9V to 36V, 0V to 8.4A)
±0.06
%
POUT/PIN
Efficiency
VIN = 48V, IOUT = 35A
>92
%
POUT/PIN
Efficiency
VIN = 48V, IOUT = 25A
>93
%
Isolation
Basic
Approximate Size
Component Area × Top Component Height
1500
4.3 × 2.9 × 0.4
VDC
Inches
OPERATING PRINCIPLES
The LTC3722 synchronous dual mode phase modulated
full bridge controller is used on the primary and works
together with the LTC3901 secondary side synchronous
driver to provide a synchronous rectified output. When an
input voltage is applied, the LTC3722 begins a controlled
soft-start of the output voltage. As this voltage begins
to rise, the LT1431 programmable reference is quickly
powered up via the output voltage. The LT1431 provides
feedback via opto-coupler ISO1 to set the output voltage
at 12V. The LTC4440 high voltage gate driver is used to
level shift the high side primary MOSFETs gate signals.
The LTC3722 provides precise control of gate signals to
primary MOSFETs and secondary MOSFETs via T3 and
U1 (LTC3901). The LTC3901 includes a timer and current
sense to limit reverse inductor current.
For large values of input inductance, a 100V, 47µF electrolytic capacitor can be added across the input terminals to
damp the input filter and provide adequate stability. See
Linear Technology Application Note 19 for a discussion
on input filter stability analysis. A recommended part is
the Sanyo 100MV47AX.
dc607af
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DEMO MANUAL DC607A
QUICK START PROCEDURE
Demonstration circuit 607A is easy to set up to evaluate
the performance of the LTC3722, LTC4440, LTC3901,
and LT1431. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below:
NOTE. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the output (or input) voltage
ripple by touching the probe tip and probe ground directly
across the +Vout and –Vout (or +Vin and –Vin) terminals
or input/output capacitors. See Figure 2 for proper scope
probe technique.
1. Set an input power supply that is capable of 36V to 72V
to a voltage of 36V. Then turn off the supply.
2. 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 LTC3722.
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 DC607A’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.
3. Turn on the power at the input.
NOTE. Make sure that the input voltage never exceeds
72V.
4. Check for the proper output voltage of 12V ±1%. Turn
off the power at the input.
5. Once the proper output voltage is established, connect
a variable load capable of sinking 35A 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 35Adc
can be put in series with the output load in order to
measure the DC607A’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.
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.
dc607af
2
DEMO MANUAL DC607A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
GND
VIN
Figure 2. Measuring Input or Output Ripple
dc607af
3
DEMO MANUAL DC607A
QUICK START PROCEDURE
Figure 3. Transient Response, 0A to 35A, 48VIN (200mV and 0.5ms/Div)
dc607af
4
DEMO MANUAL DC607A
QUICK START PROCEDURE
Figure 4. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Frontside
Figure 5. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Backside
dc607af
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DEMO MANUAL DC607A
QUICK START PROCEDURE
Figure 6. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Frontside
Figure 7. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Backside
dc607af
6
DEMO MANUAL DC607A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., X7R, 0.82µF, 100V, 10%, 1812
VITRAMON, VJ1812Y824KXBAT
Required Circuit Components
1
6
C1, C2, C3, C4, C5, C46
2
2
C24, C31
CAP., X7R, 1.0µF, 25V, 10%, 1206
AVX, 12063C105KAT2A
3
1
C7
CAP., NPO, 470pF, 200V, 10%, 1206
AVX, 12062A471KAT2A
4
1
C16
CAP., X7R, 0.1µF, 25V, 10%, 0805
AVX, 08053C104KAT2A
5
2
C13, C36
CAP., OSCON, 180µF, 16V, 20%,
PANASONIC, 16SEP180M
6
1
C14
CAP., TANT., 68µF, 20V, 20%, 7343
AVX, TPSE686M020R0150
7
1
C21
CAP., X7R, 0.047µF, 25V, 10%, 0805
AVX, 08053C473KAT2A
8
1
C23
CAP., X7R, 0.022µF, 25V, 10%, 0805
AVX, 08053C223KAT2A
9
1
C26
CAP., X7R, 0.47µF, 25V, 10%, 1206
AVX, 12063C474KAT2A
10
1
C27
CAP., NPO, 330pF, 25V, 10%, 0805
AVX, 08053A331KAT2A
11
1
C28
CAP., NPO, 180pF, 25V, 10%, 0805
AVX, 08053A181KAT2A
12
2
C32, C49
CAP., NPO, 220pF, 25V, 10%, 0805
AVX, 08053A221KAT2A
13
1
C29
CAP., X7R, 0.068µF, 25V, 10%, 0805
AVX, 08053C683KAT2A
14
1
C30
CAP., CER., 2.2nF, 250V, +20, –55%
MURATA, DE2E3KH222MB3B
15
2
C34, C35
CAP., X7R, 0.22µF, 25V, 10% 0805
AVX, 08053C224KAT2A
16
1
C40
CAP., X7R, 2.2nF, 25V, 10%, 0603
AVX, 06033C222KAT2A
17
1
C41
CAP., NPO, 220pF, 25V, 10%, 0603
AVX, 06033AA221JAT2A
18
2
C42, C43
CAP., NPO, 22pF, 25V, 10%, 0603
AVX, 06033AA220JAT2A
19
2
C44, C45
CAP., X7R, 0.47µF, 100V, 10% 1210
TDK C3225X7R2A474K
20
2
C47, C48
CAP., X5R, 1µF, 25V, 10% 0603
AVX, 06033D105KAT2A
21
1
C50
CAP., NPO 330pF, 25V, 10% 0603
AVX, 06033A331KAT2A
22
2
C58, C59
CAP., X7R 0.1µF, 16V, 10%, 0603
AVX, 0603YC104KAT2A
23
3
D21, D22, D25
SUPER-FAST RECTIFIER, MURS120
DIODES INC., MURS120-13-F
24
4
D12, D14, D23, D24
DIODE, FAST SWITCHING DIODE, SOT23
DIODES INC., BAS21-7-F
25
1
D16
DIODE, 10V, SOT23,
DIODES INC., MMBZ5240B-7-F
26
1
D20
DIODE, 5.1V, SOT23
DIODES INC., MMBZ5231B-7-F
27
1
D26
DIODE, 3.3V, SOT23
DIODES INC., MMBZ5226B-7-F
28
1
D28
DIODE, SCHOTTKY, SOT23
DIODES INC., BAT54-7-F
29
1
ISO1
I.C., OPTOISOLATORS, SO8
FAIRCHILD SEMI., MOC207M
30
1
L1
INDUCTOR, 0.85µH,
PULSE, PA1294.910NL
31
1
L2
INDUCTOR, 150nH,
PULSE, PA0651NL
32
1
L4
INDUCTOR, 1.0mH, DO1608C
COILCRAFT, DO1608C-105
33
1
L5
INDUCTOR, 1.3µH, CDEP105
SUMIDA, CDEP105-1R3MC-50
34
4
Q7, Q9, Q25, Q26
XSTR., NPN, SOT23
ZETEX, FMMT619TA
35
16
Q3, Q4, Q8, Q11-Q15, Q23, Q24,
Q27-Q30, Q32, Q33
N-MOSFET, Si7852DP, POWERPAK-SO-8
VISHAY, Si7852DP-T1-GE3
36
4
Q10, Q16-Q18
XSTR., PNP, SOT23
DIODE INC., FMMT718TA
37
2
Q34, Q35
XSTR., SWITCHING NPN, SOT23
DIODE INC., MMBT3904-7-F
38
2
R2, R5
RES., 3.9k, 1/4W, 5%, 1206
VISHAY, CRCW12063K90JNEA
39
5
R1, R4, R6, R8, R10
RES., 240Ω, 1/4W, 5%, 1206
VISHAY, CRCW1206240KJNEA
40
2
R3, R91
RES., 1k, 1/16W, 5%, 0603
VISHAY, CRCW06031K00JNEA
dc607af
7
DEMO MANUAL DC607A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
41
1
R18
RES., 182k, 1/8W, 1%, 0805
VISHAY, CRCW0805182KFKEA
42
1
R22
RES., 30.1k, 1/8W, 1%, 0805
VISHAY, CRCW080530K1FKEA
43
1
R30
RES., 20k, 1/8W, 5%, 0805
VISHAY, CRCW080520K0JNEA
44
2
R32, R33
RES., 4.99k, 1/16W, 1%, 0603
VISHAY, CRCW06034K99FKEA
45
1
R37
RES., 470Ω, 1/8W, 5%, 1206
VISHAY, CRCW1206470RJNEA
46
1
R38
RES., 330Ω, 1/8W, 5%, 0805
VISHAY, CRCW0805330RJNEA
47
1
R39
RES., 150Ω, 1/16W, 5%, 0805
VISHAY, CRCW0805150RJNEA
48
1
R40
RES., 2.7k, 1/16W, 5%, 0805
VISHAY, CRCW08052K70JNEA
49
1
R41
RES., 10k, 1/8W, 5%, 0805
VISHAY, CRCW080510K0JNEA
50
1
R42
RES., 9.53k, 1/8W, 1%, 0805
VISHAY, CRCW08059K53FKEA
51
1
R43
RES., 750Ω, 1/8W, 5%, 0603
VISHAY, CRCW0603750RJNEA
52
1
R44
RES., 5.1k, 1/16W, 5%, 0603
VISHAY, CRCW06035K10JNEA
53
1
R46
RES., 2.49k, 1/8W, 1%, 0805
VISHAY, CRCW08052K49FKEA
54
1
R47
RES., 33k, 1/16W, 5%, 0603
VISHAY, CRCW060333K0JNEA
55
2
R48, R49
RES., 0.020Ω 1.5W, 2%, 2512
IRC, LRC-LRF2512LF-01-R020-G
56
1
R53
RES., 22Ω, 1/8W, 5%, 0805
VISHAY, CRCW080522R0JNEA
57
1
R58
RES., 10k 1/16W, 5%, 0603
VISHAY, CRCW060310K0JNEA
58
2
R54, R55
RES., 80.6k, 1/16W, 1%, 0603
VISHAY, CRCW060380K6FKEA
59
1
R56
RES., 20.0k, 1/16W, 1%, 0603
VISHAY, CRCW060320K0FKEA
60
2
R65, R66
RES., 18.2k, 1/16W, 1%, 0603
VISHAY, CRCW060318K2JNEA
61
1
R71
RES., 8.25k, 1/16W, 1%, 0603
VISHAY, CRCW06038K25FKEA
62
4
R72-R75
RES., 100Ω, 1W, 5%, 2512
VISHAY, CRCW2512100RJNEA
63
1
R84
RES., 100Ω, 1/4W, 5%, 1206
VISHAY, CRCW1206100RJNEA
64
2
R85, R88
RES., 4.87k, 1/4W, 1%, 1206
VISHAY, CRCW12064K87FKEA
65
2
R86, R89
RES., 2.21k, 1/16W, 1%, 0603
VISHAY, CRCW06032K21FKEA
66
2
R87, R90
RES., 1.50Ω, 1/16W, 1%, 0603
VISHAY, CRCW06031K50FKEA
67
1
R92
RES., 39.2k, 1/16W, 1%, 0603
VISHAY, CRCW060339K2FKEA
68
1
R93
RES., 100Ω, 1/16W, 5%, 0603
VISHAY, CRCW0603100RJNEA
69
1
R94
RES., 100Ω, 1/8W, 5%, 0805
VISHAY, CRCW0805100RFKEA
70
1
R95
RES., 200k, 1/16W, 5%, 0603
VISHAY, CRCW0603200KJNEA
71
1
R15
RES., 1M, 1/16W, 5%, 0603
VISHAY, CRCW06031M00JNEA
72
2
T1, T4
TRANSFORMER,
PULSE, PA0526NL
73
1
T5
TRANSFORMER,
PULSE, PA0297NL
74
1
U1
I.C., LTC3901EGN SSOP-16
LINEAR, LTC3901EGN#PBF
75
1
U2
I.C., LTC3722EGN-1, SSOP-24GN
LINEAR, LTC3722EGN-1#PBF
76
1
U3
I.C., LT1431CS8, SO8
LINEAR, LT1431CS8#PBF
77
2
U5, U6
I.C., LTC4440EMS8E, MSOP-8/EXPOSED
LINEAR, LTC4440EMS8E#PBF
dc607af
8
DEMO MANUAL DC607A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1
0
C19, C20, C22, C53, C56, C57
CAP., 0805
OPT
2
0
Q37 (OPT.)
XSTR., PNP, SOT23
OPT
3
0
R7 (OPT.)
RES., 1206
OPT
4
0
R9, R11, R12, R14, R31, R61, R62
RES., 0603
OPT
5
15
R13, R57, R59, R60, R63, R64,
R76-R83, R98
RES., 0 JUMPER, 0603
VISHAY, CRCW06030000Z0EA
6
0
R23-R28, R34 (OPT.)
RES., 0805
OPT
7
1
R45
RES., 0 JUMPER, 0805
VISHAY, CRCW08050000Z0EA
8
2
R50, R51
RES., 33Ω, 1/8W, 5%, 0805
VISHAY, CRCW080533R0JNEA
Hardware: For Demo Board Only
1
4
P1, P2, P3, P4
MICRO PINS, 0.08 PIN-SWAGE MOUNT
KEYSTONE, 1455-2
2
4
STANDOFF
STAND-OFF, NYLON 0.50" TALL
KEYSTONE, 8833(SNAP ON)
3
1
PRINTED CIRCUIT BOARD
DEMO CIRCUIT #607A
dc607af
9
C59
0.1uF
C3,C4,C5,C46
4x0.82uF
100V
A
1
IN
R22
30.1K
R18
182K
VIN
C24
1.0uF
12V
R39
150
C32
220pF
20K
1/4W
R30
12
18
10
R32
4.99k
B R65
18.2K
22pF
C42
UVLO
VIN
SBUS
C26
0.47uF
5VREF
D23
7
6
C34
0.22uF
20.0K
R56
22pF
C43
R55
80.6K
R48
0.020
1.5W
A
R3
220pF
C28
180pF
R44
5.1K
B
1K
R49
0.020
1.5W
1
C
R47
33K
IN
D
U6
7
C35
0.22uF
C45
0.47uF
100V
R53
22
+
12V
Q16
Q9
12V
CS
MMBT3904 330pF
68nF
C27
Q35 1M
R15
8.25K
C29
D28
R71
3
0.1uF
C16
1
8
5
C30
2.2nF
250V
6
R43
750
2.2nF
C40
200K
D14
D12
T5
1(1.5mH):0.5
1.0mH
L4
2
2
1
5
4
R86
2.21K
R37
2.7K
REF
U3
R89
2.21K
R42
9.53K
-VOUT
R46
2.49K
1
C23
22nF
R41
10K
C50
330pF
PVCC
C48
1uF
D16
10V
CUSTOMER NOTICE
LINEAR TECHNOLOGY CORPORATION
CONFIDENTIAL
THIS CIRCUIT IS DISTRIBUTED
TO CUSTOMERS ONLY FOR USE
WITH LTC PARTS.
C47
1uF
R93
100
R91
1K
Q34
MMBT3904
-Vout
+VOUT
-VOUT
C31
1.0uF
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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY
AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
-VOUT
R92
39.2K
+VOUT
R51
33
Q26
Q18
R90
1.50K
+VOUT
LT1431CS8
8
470 1/4W
R40
COLL
C21
0.047uF
D20
5.1V
R50 R88
33 4.87K
1/4W
+VOUT
LTC3901EGN
U1
1
Q17
Q25
+Vout
12V/35A
+VOUT
VHIGH
C7
470pF
200V
R1,R4,R6,R8,R10
5x240,0.25W=48
VLOW
0.85uH
Q14,Q15,Q24,Q33
+
4xSi7852DP
C13,C36
2x180uF
16V
L1
-VOUT
D25
C1
0.82uF
100V
+VOUT
R2,R5
2x3.9K,0.25W=2k
Q12,Q13,Q23,Q32
4xSi7852DP
R87
1.50K
VHIGH
SYNC
C49
220pF
R94
100
9
R85
4.87K
1/4W
7
8
10
11
7
8
10
11
ISO1
MOC207
R38
330
1
6
T4
5:5(105uH):1:1
Q11,Q30
2xSi7852DP
2xSi7852DP
4
2
R74,R75
2x100,
1W=50
Q4,Q28
4
C44
100V
0.47uF T1
5:5(105uH):1:1
D21
VLOW
D22
ISNS 5VREF
R95
3.3V
100
D26
R84
LTC4440-EMS8E
C14
68uF
20V
D
TG
BOOST
6
D24
R72,R73
2x100,1W=50
Figure 8. Schematic without Optional Components
R58
10K
C
ISNS
12V
Q8,Q29
2xSi7852DP
150nH
L2
C58
0.1uF
Q3,Q27
2xSi7852DP
LTC3722EGN-1
U2
C41
R33
4.99k
C R66
18.2K
Q10
LTC4440-EMS8E
12V
B
Q7
U5
TG
BOOST
R54
80.6K
0.47uF, 100V TDK C3225X7R2A474K (1210)
0.82uF, 100V Vishay VJ1812Y824KXBAT (1812)
180uF, 16V Sanyo 16SP180M
C14 AVX TPSE686M020R0150
C30 MuRata DE2E3KH222MB3B
D21,D22,D25 MURS120T3
D23,D24,D12,D14 BAS21
D26 3.3V MMBZ5226B
D28 BAT54
D16 10V MMBZ5240B
D20 5.1V MMBZ5231B
L1 PA1294.910
L2 Pulse PA0651
L4 Coilcraft DO1608C-105
L5 Sumida CDEP105-1R3MC-50
Q7,Q9,Q25,Q26 Zetex FMMT619
Q10,Q16,Q17,Q18 Zetex FMMT718
T1,T4 Pulse PA0526
5VREF
T5 Pulse PA0785
-Vin
C2
0.82uF
100V
3
VCC
GND
GND
4
2
3
VCC
GND
GND
36-72Vin
12V
TS
8
VIN
TS
8
11
ADLY
6
CSE+
12
L5
1.3uH
NC
8
CT
24
VREF
14
SYNC
1
SPRG
13
DPRG
2
9
PDLY
21
OUTA
20
OUTB
RLEB
5
19
OUTC
FB
6
3
4
2
PGND
22
GND
23
17
OUTD
16
OUTE
15
OUTF
SS
7
2
5
COMP
GND
8
6
GND2
10
RTOP
RMID
V+
GND-F
PGND
4
4
GND-S COMP
7
4
PGND2
13
5
CSE-
2
ME
3
ME2
11
CSF+
14
CSF-
TIMER
7
15
MF
16
MF2
10
VCC
+Vin
DEMO MANUAL DC607A
SCHEMATIC DIAGRAM
dc607af
C59
0.1uF
C3,C4,C5,C46
4x0.82uF
100V
A
1
IN
R22
30.1K
R18
182K
VIN
C24
1.0uF
12V
R39
150
C32
220pF
20K
1/4W
R30
12
18
10
R32
4.99k
B R65
18.2K
22pF
C42
UVLO
VIN
SBUS
C26
0.47uF
5VREF
D23
7
6
C34
0.22uF
20.0K
R56
22pF
C43
R55
80.6K
R48
0.020
1.5W
A
R3
220pF
C28
180pF
R44
5.1K
B
1K
R49
0.020
1.5W
R58
10K
C
1
C
ISNS
12V
Q8,Q29
2xSi7852DP
150nH
L2
C58
0.1uF
Q3,Q27
2xSi7852DP
LTC3722EGN-1
U2
C41
R33
4.99k
C R66
18.2K
Q10
LTC4440-EMS8E
12V
B
Q7
U5
TG
BOOST
R54
80.6K
0.47uF, 100V TDK C3225X7R2A474K (1210)
0.82uF, 100V Vishay VJ1812Y824KXBAT (1812)
180uF, 16V Sanyo 16SP180M
C14 AVX TPSE686M020R0150
C30 MuRata DE2E3KH222MB3B
D21,D22,D25 MURS120T3
D23,D24,D12,D14 BAS21
D26 3.3V MMBZ5226B
D28 BAT54
D16 10V MMBZ5240B
D20 5.1V MMBZ5231B
L1 PA1294.910
L2 Pulse PA0651
L4 Coilcraft DO1608C-105
L5 Sumida CDEP105-1R3MC-50
Q7,Q9,Q25,Q26 Zetex FMMT619
Q10,Q16,Q17,Q18 Zetex FMMT718
T1,T4 Pulse PA0526
5VREF
T5 Pulse PA0785
-Vin
C2
0.82uF
100V
3
VCC
GND
GND
4
2
IN
D
U6
7
C35
0.22uF
C45
0.47uF
100V
R53
22
+
12V
Q16
Q9
12V
CS
MMBT3904 330pF
68nF
C27
Q35 1M
R15
8.25K
C29
D28
R71
3
0.1uF
C16
1
8
5
C30
2.2nF
250V
6
R43
750
2.2nF
C40
200K
D14
D12
T5
1(1.5mH):0.5
1.0mH
L4
2
2
1
5
4
R86
2.21K
R37
2.7K
REF
U3
R89
2.21K
R42
9.53K
-VOUT
R46
2.49K
1
C23
22nF
R41
10K
C50
330pF
PVCC
C48
1uF
D16
10V
CUSTOMER NOTICE
LINEAR TECHNOLOGY CORPORATION
CONFIDENTIAL
THIS CIRCUIT IS DISTRIBUTED
TO CUSTOMERS ONLY FOR USE
WITH LTC PARTS.
C47
1uF
R93
100
R91
1K
Q34
MMBT3904
-Vout
+VOUT
-VOUT
C31
1.0uF
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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY
AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
-VOUT
R92
39.2K
+VOUT
R51
33
Q26
Q18
R90
1.50K
+VOUT
LT1431CS8
8
470 1/4W
R40
COLL
C21
0.047uF
D20
5.1V
R50 R88
33 4.87K
1/4W
+VOUT
LTC3901EGN
U1
1
Q17
Q25
+Vout
12V/35A
+VOUT
VHIGH
C7
470pF
200V
R1,R4,R6,R8,R10
5x240,0.25W=48
VLOW
0.85uH
Q14,Q15,Q24,Q33
+
4xSi7852DP
C13,C36
2x180uF
16V
L1
-VOUT
D25
C1
0.82uF
100V
+VOUT
R2,R5
2x3.9K,0.25W=2k
Q12,Q13,Q23,Q32
4xSi7852DP
R87
1.50K
VHIGH
SYNC
C49
220pF
R94
100
9
R85
4.87K
1/4W
7
8
10
11
7
8
10
11
ISO1
MOC207
R38
330
1
6
T4
5:5(105uH):1:1
Q11,Q30
2xSi7852DP
2xSi7852DP
4
2
R74,R75
2x100,
1W=50
Q4,Q28
4
C44
100V
0.47uF T1
5:5(105uH):1:1
D21
VLOW
D22
ISNS 5VREF
R95
3.3V
100
D26
R84
LTC4440-EMS8E
C14
68uF
20V
D
TG
BOOST
6
D24
R72,R73
2x100,1W=50
Figure 9. Schematic with Optional Components
R47
33K
3
VCC
GND
GND
36-72Vin
12V
TS
8
VIN
TS
8
11
ADLY
6
CSE+
12
L5
1.3uH
NC
8
CT
24
VREF
14
SYNC
1
SPRG
13
DPRG
2
9
PDLY
21
OUTA
20
OUTB
RLEB
5
19
OUTC
FB
6
3
4
2
PGND
22
GND
23
17
OUTD
16
OUTE
15
OUTF
SS
7
2
5
COMP
GND
8
6
GND2
10
RTOP
RMID
V+
GND-F
PGND
4
4
GND-S COMP
7
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.
4
PGND2
13
5
CSE-
2
ME
3
ME2
11
CSF+
14
CSF-
15
MF
TIMER
7
MF2
16
VCC
+Vin
DEMO MANUAL DC607A
SCHEMATIC DIAGRAM
dc607af
11
DEMO MANUAL DC607A
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
dc607af
12 Linear Technology Corporation
LT 0315 • 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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