Quick Start Guide for Demo Board DC418
DC418 is an isolated triple output power supply based on the LT1737CS high power isolated
flyback controller IC. This demo board is intended to provide power to data acquisition cards in
industrial control applications. The input to this demo board is 8–32 Volts DC and there are three
outputs. The outputs are +5V at 0–200mA, +15V at 0–100mA and –15V at 0–100mA. The
isolation between the primary and the secondary is 1500VDC. Regulation of the output voltage is
within 5% for all line voltages with any combination of loads between 10 and 100%. In the event
that one output is totally unloaded and both other outputs are fully loaded output regulation on the
unloaded output is within 7%.
Quick Start Procedure
Refer to Figure 1 for proper measurement equipment setup and follow the procedure below:
Input Side
1.
2.
Connect the positive output of the power source (8–36V, 10W) to VIN+.
Connect the negative output of the power source to the input GND terminal.
Optional: Add an ammeter in series with the power supply (1A full scale).
Optional: Connect a voltmeter across the input terminals.
Optional: If you want to be able to turn the board on and off, connect a switch between the
GND and the SD pins.
Output Side
3.
4.
5.
Connect voltmeters between the COM and output terminals.
Connect ammeters in series with the loads on the outputs.
Return all the loads to the COM terminal.
Once all the connections are made, turn on the power source and measure the performance of
the board.
DC418 Quick Start Guide
Page 1 of 2
+
–
+
+
LOAD
+VIN
Linear Technology
(408) 432-1900
www.linear-tech.com
+15V
–
+
+
–
+
LOAD
200Ω
2W
–
1k
2W
OPTIONAL
OPEN = RUN
DC418 Quick Start Guide
–
8V–36V
10W
–
GND
SD
+
+
+
–
+5V
COM
–15V
–
–
+
–
–
+
LOAD
DC418
LT1737CS
ISOLATED, TRIPLE OUPUT
POWER SUPPLY
+
–
1k
2W
Figure 1. Proper Measurement Equipment Setup
Page 2 of 2
5
4
3
2
1
R20
75K
R21
3
D
100K
1
2
D
Q3
MMBT3906
2
D9
R22
C14
1N4148W
D3
BAW56
1
3
X1
VI+
E1
+VIN
+VIN
8 TO 36 VIN
C7
C2
C1
R7
R17
3
L1
4
2
2
10
1
T1
390
1206
22PF 100V
0805
D7
R11
X4
31314R
2
1.8
B160
1
0.25W
1206
+15V
E4
VO2+
+15V
@100mA
33UH
E5
5
9
2
D5
1
1
+5V
1
+5V
@200mA
B120
7
C8
X5
D8
C9
VO1+
C
0.1UF
C
10UF
50V
2220
10UF
50V
2220
1
47
0805
Q1
R2
1
2
50V
0805
E2
GND
X2
VI-
GND
22K
D4
22UF
MMBT3904
13
D2
C13
1
6
25V
2220
2
BZT52C12
12V
2
BZT52C3V3
3.3V
100UF
6.3V
2220
X6
100PF
0805
R1
5
6
7
8
R13
2
Q2
Si4482DY
C3
1
2
3
1N4148W
1
C5
4
D1
BZT52C10
10V
2
1K
1206
47
1206
E6
COM
COM
COM
0.1UF
R4
R3
25V
15
16
R10
33
22UF
25V
2220
1
R18
ISENSE
2
9
14
1
2
D6
R8
-15V
E7
-15V
@100mA
25.5K
1%
1M
8
FB
UVLO
VC
OSCAP
SFST
SGND
MINENAB
E3
B
R6
GATE
VCC
1K
10
7
100
B160
1.8
0.25W
1206
X7
VO3-
B
SD
X3
SD
U1
6
3
11
LT1737CS
ROCMP
RCMPC
5
ENDLY
3VOUT
TON
PGND
12
13
4
R12
R5
R16
C12
C10
C11
3.01K
1%
243K
1%
1000PF
25V
33PF
1000PF
25V
R15
R14
R9
1%
C6
R19
0.12
0.25W
1206
C4
100K 100K 2.0K
0.1UF
25V
47K
LINEAR TECHNOLOGY CORP
LTC CONFIDENTIAL-FOR CUSTOMER USE ONLY
1630 McCARTHY BLVD. MILPITAS, CA 95035
PH. (408) 954-8400 FAX (408) 434-0507
Title
A
2.2NF 250V
A
ISOLATED, TRIPLE OUTPUT POWER SUPPLY
Size
Document Number
Monday, July 16, 2001
Sheet
1
Rev
A
Date:
5
4
3
2
DC418A-2 * LT1737CS
A
1
of
1
Linear Technology Corporation
LT1737CS
BILL OF MATERIALS
DC418A-2
6/16/2005
4:17 PM
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Qty
2
2
1
2
1
1
1
2
1
1
1
2
1
1
1
2
1
7
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
3
1
1
1
1
1
1
1
1
7
Reference
C1,C2
C3,C8
C4
C5,C6
C7
C9
C10
C11,C12
C13
C14
D1
D2,D9
D3
D4
D5
D6,D7
D8
E1-E7
L1
Q1
Q2
Q3
R1
R2
R3
R4
R5
R6
R7
R8,R11
R9
R10
R12
R13
R14,R15,R21
R16
R17
R18
R19
R20
R22
T1
U1
X1-X7
Part Description
CAP., 10UF 50V,2220
CAP., 22UF 25V,2220
CAP., 2.2NF 250V,+/-10%
CAP., Y5V 0.1UF 25V,0603
CAP., Y5V 0.1UF 50V,0805
CAP., 100UF 6.3V,2220
CAP., NPO 33PF 50V
CAP., X7R 1000PF 50V
CAP., NPO 100PF 50V
CAP., NPO 22PF 100V
ZDIODE, 10V 350mW, BZT52C10, SOD123
DIODE, 75V 500mA, 1N4148W, SOD123
DIODE, BAW56, SOT23
ZDIODE, 12V 350mW, BZT52C12, SOD123
DIODE, 1A 20V, B120, SMA-DIODE
DIODE, 1A 60V, B160, SMA-DIODE
ZDIODE, 3.3V 350mW, BZT52C3V3, SOD123
TP, TURRET, .094"
IND, 33UH, DO1608C-332
TRANSISTOR, NPN,MMBT3904, SOT23
TRANSISTOR, Si4482DY,SO8
TRANSISTOR, PNP,MMBT3906, SOT23
RES, CHIP 1K, 5%,1206
RES, CHIP 13, 5%,0603
RES, CHIP 1M, 5%,0603
RES, CHIP 25.5K, 1%,0603
RES, CHIP 3.01K, 1%,0603
RES, CHIP 1K, 5%,0603
RES, CHIP 47, 5%,0805
RES, CHIP 1.8, .25W, 5%,1206
RES, CHIP 2.0K, 5%,0603
RES, CHIP 33, 5%,0603
RES., CHIP 0.12 1/4W 1%, 1206
RES, CHIP 47, 5%,1206
RES, CHIP 100K, 5%,0603
RES, CHIP 243K, 1%,0603
RES, CHIP 22K, 5%,0603
RES, CHIP 100, 5%,0603
RES, CHIP 47K, 5%,0603
RES, CHIP 75K, 5%,0603
RES, CHIP 390, 5%,1206
TRANSFROMER, 31314R
IC, LT1737CS, SO16
PIN 0.040" X 0.32" TIN, PAD080-043
Manufacture / Part #
TDK C5750X5R1H106M
TDK C5750X5R1E226M
MURATA GHM3045X7R222K-GC
AVX 06033G104ZAT1A
AVX 08055G104ZAT1A
TDK C5750X5R0J107MT
AVX 06035A330MAT1A
AVX 06035C102MAT1A
AVX 08055A101MAT1A
AVX 08051A220MAT1A
DIODES INC. BZT52C10-7
DIODES INC. 1N4148W-7
DIODES INC. BAW56-7
DIODES INC. BZT52C12-7
DIODES INC. B120-13
DIODES INC. B160-13
DIODES INC. BZT52C3V3-7
MILL-MAX 2501-2
COILCRAFT DO1608C-332
DIODES MMBT3904-7
SILICONIX Si4482DY
DIODES MMBT3906-7
AAC CR18-102JM
AAC CR16-130JM
AAC CR16-105JM
AAC CR16-2552FM
AAC CR16-3011FM
AAC CR16-102JM
AAC CR10-470JM
AAC CR18-1R8JM
AAC CR16-202JM
AAC CR16-330JM
IRC, LR1206-01-R120-F
AAC CR18-470JM
AAC CR16-104JM
AAC CR16-2433FM
AAC CR16-223JM
AAC CR16-101JM
AAC CR16-473JM
AAC CR16-753JM
AAC CR18-391JM
MIDCOM 31314R
LINEAR TECH. LT1737IS
KEYSTONE 1425-2
NOTES: X1-X7 ARE MOUNTED ON BOTTOM SIDE.
Page 1 - of - 1
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