Linear LTC4440 User manual

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DEMO MANUAL DC607A
Description
LTC3722, LTC4440, LTC3901,
and LT1431
Isolated Full Bridge Converter
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
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
performance summary
operating principles
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
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 36 72 V
VOUT Output Voltage 12.0 V
IOUT Output Current Range VIN = 48V, 200LFM 0 35 A
fSW Switching (Clock) Frequency 200 kHz
VOUT(P-P) Output Ripple VIN = 48V, IOUT = 35A (20MHz BW) 140 mVP-P
IREG Output Regulation Line and Load (36V to 72V, 0A to 35A) ±0.08 %
POUT/PIN Efficiency VIN = 48V, IOUT = 35A >93.9 %
POUT/PIN Efficiency VIN = 48V, IOUT = 25A >94.6 %
Isolation Basic 1500 VDC
Approximate Size Component Area × Top Component Height 4.3 × 2.9 × 0.4 Inches
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 electro-
lytic 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 SUNCON 100ME47AX.

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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. Withpoweroff,connectthesupplytotheinputterminals
+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. Avoltmeterwithacapabilityofmeasuringatleast12V
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.

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DEMO MANUAL DC607A
Figure 2. Measuring Input or Output Ripple
Figure 1. Proper Measurement Equipment Setup
Quick start proceDure
GND
VIN

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DEMO MANUAL DC607A
Quick start proceDure
Figure 3. Transient Response, 0A to 35A, 48VIN (200mV and 0.5ms/Div)

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DEMO MANUAL DC607A
Quick start proceDure
Figure 5. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Backside
Figure 4. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Frontside

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DEMO MANUAL DC607A
Quick start proceDure
Figure 7. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Backside
Figure 6. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Frontside

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DEMO MANUAL DC607A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 6 C1, C2, C3, C4, C5, C46 CAP, X7R, 0.82µF, 100V, 10%, 1812 VISHAY, VJ1812Y824KXBAT
2 2 C24, C31 CAP, X7R, 1µF, 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+TSS
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, 5%, 0805 AVX, 08053A221JAT2A
13 1 C29 CAP, X7R, 0.068µF, 25V, 10%, 0805 AVX, 08053C683KAT2A
14 1 C30 CAP, CER, 2.2nF, 250V, +20,-55% MURATA, DE2E3KH222MB3BM02F
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, 5%, 0603 AVX, 06033A221JAT2A
18 2 C42, C43 CAP, NPO, 22pF, 25V, 10%, 0603 AVX, 06033A220KAT2A
19 2 C44, C45 CAP, X7R, 0.47µF, 100V, 10% 1210 TDK CGA6M2X7R2A474K200AA
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 IC, 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, 1mH, DO1608C COILCRAFT, DO1608C-105MLB
33 1 L5 INDUCTOR, 1.3µH, CDEP105 SUMIDA, CDEP105-1R3MC-50
34 4 Q7, Q9, Q25, Q26 XSTR, NPN, SOT23 DIODE INC, FMMT619TA
35 16 Q3, Q4, Q8, Q11 TO Q15, Q23,
Q24, Q27 TO Q30, Q32, Q33
N-MOSFET, 80V, PowerPak-SO-8 INFINEON, BSC072N08NS5ATMA1
36 4 Q10, Q16 TO Q18 XSTR, PNP, SOT23 DIODE INC., FMMT718TA
37 2 Q34, Q35 XSTR, 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, 240, 1/4W, 5%, 1206 YAGEO, RC1206JR-07240RL

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DEMO MANUAL DC607A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
40 2 R3, R91 RES, 1k, 1/16W, 5%, 0603 VISHAY, CRCW06031K00JNEA
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, 470, 1/8W, 5%, 1206 VISHAY, CRCW1206470RJNEA
46 1 R38 RES, 330, 1/8W, 5%, 0805 VISHAY, CRCW0805330RJNEA
47 1 R39 RES, 150, 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, 750, 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, 0.020, 2W,1%, 2512 STACKPOLE ELE. CSRN2512FK20L0
56 1 R53 RES, 22, 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, 20k, 1/16W, 1%, 0603 VISHAY, CRCW060320K0FKEA
60 1 R71 RES, 8.25k, 1/16W, 1%, 0603 VISHAY, CRCW06038K25FKEA
61 4 R72 TO R75 RES, 100, 1W, 5%, 2512 VISHAY, CRCW2512100RJNEA
62 1 R84 RES, 100, 1/4W, 5%, 1206 VISHAY, CRCW1206100RJNEG
63 2 R85, R88 RES, 4.87k, 1/4W, 1%, 1206 VISHAY, CRCW12064K87FKEA
64 2 R86, R89 RES, 9.09k, 1/16W, 1%, 0603 VISHAY, CRCW06039K09FKEA
65 2 R87, R90 RES, 3.16k, 1/16W, 1%, 0603 VISHAY, CRCW06033K16FKEA
66 1 R92 RES, 39.2k, 1/16W, 1%, 0603 VISHAY, CRCW060339K2FKEA
67 2 R65, R66 RES, 18.2k 1/16W, 1%, 0603 VISHAY, CRCW060318K2FKEA
68 1 R15 RES, 1M, 1/16W, 5%, 0603 VISHAY, CRCW06031M00JNEA
69 1 R93 RES, 100Ω 1/16W, 5%, 0603 VISHAY, CRCW0603100RJNEA
70 1 R94 RES, 100Ω 1/16W, 1%, 0805 VISHAY, CRCW0805100RFKEA
71 1 R95 RES, 200k, 1/16W, 5%, 0603 VISHAY, CRCW0603200KJNEA
72 2 T1, T4 TRANSFORMER PULSE, PA0526NL
73 1 T5 TRANSFORMER PULSE, PA0297NL
74 1 U1 IC, LTC3901EGN SSOP-16 LINEAR, LTC3901EGN#PBF
75 1 U2 IC, LTC3722EGN-1, SSOP-24GN LINEAR, LTC3722EGN-1#PBF
76 1 U3 IC, LT1431CS8, SO8 LINEAR, LT1431CS8#PBF
77 2 U5, U6 IC, LTC4440EMS8E,MSOP-8/Exposed LINEAR, LTC4440EMS8E#PBF

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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, OPT, 0805 OPT
2 0 Q37 (OPT) XSTR, PNP, SOT23 OPT
3 0 R7 (OPT) RES, OPT, 1206 OPT
4 0 R9, R11, R12, R14, R31, R61,
R62
RES, OPT, 0603 OPT
5 15 R13, R57, R59, R60, R63, R64,
R76 TO R83, R98
RES, 0 JUMPER, 0603 VISHAY, CRCW06030000Z0EA
6 0 R23 TO R28, R34 (OPT) RES, OPT, 0805 OPT
7 1 R45 RES, 0 JUMPER, 0805 VISHAY, CRCW08050000Z0EA
8 2 R50, R51 RES, 33, 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 STANDOFF, NYLON 0.50" TALL.HOLE 0.125 WURTH ELEKTRONIK, 702935000
3 1 PRINTED CIRCUIT BOARD DEMO CIRCUIT #607A

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DEMO MANUAL DC607A
Figure 8. Schematic without Optional Components
schematic Diagram
LINEAR TECHNOLOGY CORPORATION CONFIDENTIAL THIS CIRCUIT IS DISTRIBUTED TO CUSTOMERS ONLY FOR USE WITH LTC PARTS.
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.
CUSTOMER NOTICE
+Vin
-Vin
36-72Vin 0.47uF, 100V TDK C3225X7R2A474K (1210) 0.82uF, 100V Vishay VJ1812Y824KXBAT (1812) 180uF, 16V Panasonic 16SEP180M+TSS 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 Diodes Inc FMMT619 Q10,Q16,Q17,Q18 Diodes Inc FMMT718 T1,T4 Pulse PA0526 T5 Pulse PA0297
+Vout
-Vout
12V/35A
08NS5
ISNS
12V
C
VIN
12V
-VOUT
5VREF
+VOUT
+VOUT
A5VREF
-VOUT
ISNS
+VOUT
+VOUT
+VOUT
-VOUT
D
B
VLOW
A
B
12V
D
VHIGH
12V
B
C
-VOUT
+VOUT
12V
VIN
5VREF
C
12V
VHIGH
VLOW
0.047uF
C21
9.09K
R89
220pF C49
470 1/4W
R37
2xBSC072N08NS5
Q8,Q29
T1
5:5(105uH):1:1
4 11 2
7 10
8
0.47uF
C26
2xBSC072N Q3,Q27
D22
+
C14 68uF 20V
D20 5.1V
4.99k
R32
3.16K R90
MOC207
ISO1
1 2
6
5
D14
330 R38
4.87K
1/4W
R85
0.020
2W R49
D23 D21
1uF
C47
1.0uF C31
750
R43
1K R91
MMBT3904
Q34
D24
+
C13,C36
2x180uF 16V
0.1uF
C59
20K
1/4W
R30
0.82uF 100V
C2
9.09K R86
LTC3901EGN
U1
PVCC 1
CSE+6
VCC 16
MF 14
CSF+ 11
GND2
10
CSF- 12
PGND
4
ME 2
PGND2
13
CSE-5
MF215
GND
8
ME2 3
SYNC
9
TIMER
7
LTC3722EGN-1
U2
SYNC
1
VREF
14
CT
24
OUTC 19
DPRG
2
FB
6
ADLY 11
GND
23
RLEB
5
COMP
4
OUTD 17
OUTB 20
OUTA 21
OUTE 16
OUTF 15
CS 3
PDLY 9
VIN
18
SBUS
10
SS
7
NC
8
UVLO
12
PGND
22
SPRG
13
8.25K
R71 D28
LT1431CS8
U3
COLL
1
COMP 2
V+ 3
GND-S
5
GND-F
6
REF 8
RTOP 4 RMID
7
4xBSC072N08NS5
Q14,Q15,Q24,Q33
22 R53
20.0K
R56
Q7
100 R93
C30
2.2nF
250V
80.6K
R55
220pF
C41
D16
10V
182K
R18
22pF
C43
C1 0.82uF 100V
39.2K R92
9.53K
R42
Q25
0.47uF
100V C44
Q17
1M
R15
2x3.9K,0.25W=2k R2,R5
220pF C32
MMBT3904
Q35
10K
R41
Q10
68nF
C29
2x100,1W=50 R72,R73
180pF
C28
0.22uF
C34
1uF
C48
30.1K R22
0.1uF
C58
200K R95
Q9
2xBSC072N08NS5
Q11,Q30
2.49K
R46
4xBSC072N08NS5
Q12,Q13,Q23,Q32
L5
1.3uH
2xBSC072N08NS5
Q4,Q28
D25
150 R39
18.2K
R66
80.6K
R54
D12
1.0uF
C24
4.87K 1/4W
R88
0.22uF
C35
100
R94
18.2K
R65
L4
1.0mH
2.7K
R40
T4
5:5(105uH):1:1
1 411 2
6
7 10 8
LTC4440-EMS8E
U6
VCC 3
GND
2
IN
1
TS
8
TG 7
BOOST 6
GND
4
5x240,0.25W=48 R1,R4,R6,R8,R10
T5
1(1.5mH):0.5
8
1
5
4
LTC4440-EMS8E
U5
VCC 3
GND
2
IN
1
TS
8
TG 7
BOOST 6
GND
4
Q16
L2
150nH
2x100,
1W=50
R74,R75
0.020 2W
R48
0.47uF
100V
C45
L1
0.85uH
4.99k
R33
D26
3.3V
4x0.82uF
100V
C3,C4,C5,C46
5.1K R44
330pF C27
0.1uF
C16
Q26
3.16K
R87
C7
470pF 200V
22nF
C23
1K
R3 100
R84
Q18
10K
R58
330pF C50
22pF
C42
2.2nF
C40
33K
R47

11
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DEMO MANUAL DC607A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 9. Schematic with Optional Components
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
36-72Vin
-Vin
+Vin
Note: UNLESS NOTED: All caps 25V; All resistors 0603 (1/16W) or 0805 (1/8W); Q3, Q4, Q8, Q11-15,Q23,Q24,Q27-Q30, Q32,Q33 Infineon BSC072N08NS5; Q7, Q9,Q25,Q26 Diodes Inc FMMT619; Q10, Q16-18 Diodes Inc FMMT718; D12, D14, D23, D24 BAS21; L2 Pulse PA0651; L1 PA1294.910; L5 Sumida CDEP105-1R3MC-50; L4 Coilcraft DO1608C-105; T5 Pulse PA0297; T1,T4 Pulse PA0526; D21,D22,D25 MURS120;
12V/35A
+Vout -Vout
12V
VIN
12V
VLOW
+VOUT
ISNS
SBUS
VIN B
ADLY
C DA
5VREF
ADLY
SBUS
P_LEG
A_LEG
VIN
PDLY5VREF 5VREF
12V
P_LEG
A
12V
MB
B
MD
D
CB
-VOUT
VHIGH
VLOW +VOUT
ISNS
P_LEG
C
12V
5VREF
CT
-VOUT
+VOUT
-VOUT
VHIGH
-VOUT
VHIGH
+VOUT +VOUT
ME MF
ME VLOW MF
12V
PDLY
A_LEG
CT
-VOUT
+VOUT
5VREF
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
A
DC607A
Tuesday, April 11, 2017 11
LTC3722EGN-1, 36-72Vin to 12V/35A Isolated Supply
June Wu 9/13/02
Kurk Mathews 9/13/02
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
A
DC607A
Tuesday, April 11, 2017 11
LTC3722EGN-1, 36-72Vin to 12V/35A Isolated Supply
June Wu 9/13/02
Kurk Mathews 9/13/02
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
A
DC607A
Tuesday, April 11, 2017 11
LTC3722EGN-1, 36-72Vin to 12V/35A Isolated Supply
June Wu 9/13/02
Kurk Mathews 9/13/02
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
CUSTOMER NOTICE
R98
0
R86
9.09K
R54
80.6K
C26
0.47uF
T1
5:5(105uH):1:1
1 4 11 2 6
7 10 8
R27
OPT.
R37
470 1/4W
R33
4.99K
R39 150
C21
0.047uF
D14
ISO1
MOC207
1 2
6
5
34
7
8
U1
LTC3901EGN
PVcc 1
ME 2
ME2 3
PGND
4
CSE- 5
CSE+ 6
TIMER
7
GND
8
SYNC
9
GND2
10
CSF+ 11
CSF- 12
PGND2
13
MF 14
MF2 15
Vcc 16
R31
OPT.
R15 1M
R3
1K
R80
0
Q12
4
5
23 678
1
Q27
4
5
2 3 678
1
R57
0
Q32
4
5
23 678
1
R30
20K
C29 68nF
D20 5.1V
MMBZ5231B
R48
0.020
2W
P2
C45
0.47uF 100V
R42
9.53K
Q14
4
5
23 678
1
R84 100
C31
1.0uF
R26
OPT.
Q30
4
5
2 3 678
1
D23
BAS21
Q37
opt.
R49
0.020 2W
R6
240 1/4W
R38 330
C2 0.82uF 100V
R41
10K
Q15
4
5
23 678
1
R92 39.2K
P4
R78
0
P3
Q34
MMBT3904
1
32
+
C13
180uF
16V
R83
0
R11
opt.
U3
LT1431CS8
COLL
1
COMP 2
V+ 3
GND-S
5
GND-F
6
REF 8
RTOP 4 RMID
7
D21
Q18
R74
100
1W
R88
4.87K 1/4W
C59
0.1uF
16V
C49
220pF
U2
LTC3722EGN-1
SYNC
1
VREF
14
CT
24
OUTC 19
DPRG
2
FB
6
ADLY 11
GND
23
RLEB
5
COMP
4
OUTD 17
OUTB 20
OUTA 21
OUTE 16
OUTF 15
CS 3
PDLY 9
VIN
18
SBUS
10
SS
7
NC
8
UVLO
12
PGND
22
SPRG
13
Q23
4
5
23 678
1
R25
OPT.
D28 BAT54
R63
0
D24
BAS21
R61
opt
C30
2.2nF 250V
R34
opt.
Q7
R12
opt.
R56
20.0K
R53
22
R94
100
R91
1K
Q24
4
5
23 678
1
Q28
4
5
2 3 678
1
C46 0.82uF 100V
Q35 MMBT3904
C50
330pF
D16
MMBZ5240B 10V
Q13
4
5
23 678
1
C5 0.82uF 100V
C1 0.82uF 100V
R24
OPT.
Q3
4
5
2 3 678
1
R5 3.9K
1/4W
R18
182k
R4
240 1/4W
R93
100
C32
220pF
C22 opt.
Q29
4
5
2 3 678
1
R90
3.16K
R51
33
U6
LTC4440-EMS8E
VCC 3
GND
2
IN
1
TS
8
TG 7
BOOST 6
GND
4
R13
0
R71 8.25K
C34
0.22uF
C56
opt.
C28
180pF
R95 200K
R77
0
R28
OPT.
Q17
R82
0
Q10
P1
C43
22pF
C35
0.22uF
Q8
4
5
2 3 678
1
C57 opt.
R9
opt.
R43
750
Q9
R76
0
R22
30.1k
D22
D25
MURS120
C53
opt.
R7 opt.
1/4W
L5
1.3uH
R1
240 1/4W
C20
OPT.
Q11
4
5
2 3 678
1
Q26
C4 0.82uF 100V
R64
0
C24
1.0uF
R10
240
1/4W
D12
R65
18.2K
R87
3.16K
U5
LTC4440-EMS8E
VCC 3
GND
2
IN
1
TS
8
TG 7
BOOST 6
GND
4
C19
OPT.
D26
MMBZ5226B
3.3V
C42
22pF
T4
5:5(105uH):1:1
1 4 11 2 6
7 10 8
R32
4.99K
R40
2.7K
L4
1.0mH
+
C14
68uF
20V
C47
1uF
C44
0.47uF 100V
C3 0.82uF 100V
L1
0.85uH
R59
0
R46 2.49K
+
C36
180uF
16V
R50
33
R62
opt
R81
0
R2 3.9K
1/4W
L2
150nH
Q16
R89
9.09K
C16
0.1uF
C48
1uF
C41
220pF C27
330pF
R44
5.1K
R72
100 1W
Q25
R75
100
1W
R66 18.2K
R45
0
Q4
4
5
2 3 678
1
C23
0.022uF
R55
80.6K
C7
470pF 200V
R79
0
R8
240 1/4W
R73
100 1W
R47 33K
Q33
4
5
23 678
1
C58
0.1uF
16V
C40
2.2nF
T5
8 1
5 4
R14
OPT.
R23
OPT.
R60
0
R58
10K
R85
4.87K 1/4W

12
dc607afa
DEMO MANUAL DC607A
LT 0417 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2015
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation