APPLICATION NOTE

Encapsulated AC-DC Converter
APPLICATION NOTE
1. Screws for Switching Power Supply (AQS & AQF Series)
Please be aware the length of screw should not be longer than 3 mm while you mounting/ adopting
our power supply on your end application, in case screw break through Mylar or PCB Board result in short
circuit.
2. AC Input Line Connection
The pin of AC line (L), ac neutral (N), and the third wire safety ground (FG) should be retained from the AC power
outlet to the power supply input terminals without accidental interchange. (Figure 1.1)
(Figure 1.1)
The FG pin should be connected to the equipment where power supply is placed as thicker and shorter to protect
electric shock or noise interference. (Figure 1.2)
(Figure 1.2)
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TEL: +886-2-26989508 FAX: +886-2-26981319
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Encapsulated AC-DC Converter
APPLICATION NOTE
3. Series and parallel operation
I. Series operation
Most power converters can be operated in series if they have overload limitation by either constant current or
constant power circuits. To protect each output from the reverse voltage applied by the other unit in the event
of load short circuits, reverse biased diodes are used as shown in Figure 2.1.
(Figure 2.1)
II. Parallel operation
This is only recommended with power converters specifically designed for parallel connection. In the parallel
redundant scheme illustrated in Figure 2.2 one of the power converters could be replaced by a battery followed
by a DC-DC converter to provide a no-break power system in the event of main supply failure.
(Figure 2.2)
4. Reduce the output ripple and noise
Using a LC filter or a Capacitor reduces the output ripple and noise. (Figure 3.1)
(Figure 3.1)
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TEL: +886-2-26989508 FAX: +886-2-26981319
-2-
Encapsulated AC-DC Converter
APPLICATION NOTE
5. Class I suggested circuit for lowering EMI circuitary connection
Class II suggested circuit for general application circuitary connection
Item
1
Location
F1
Description
AHC/APCN/ATCN/ANCN
Slow blow Fuse 1.5A/250V
AIC/AOC/AUC/AVC/AKC/MTC/MFC15/MTC30
Slow blow Fuse 2A/250V
AOCH/ALC/AHC08
Slow blow Fuse 2A/300V
AYC/AZC/AFC20/ASC/ATC30/AJC/ANC50/AES60/AQC100/MSC/MSC60 Slow blow Fuse 3.15A/250V
2
RV1
3
RV2
4
RV3
5
C1
6
L1
AQC125
Slow blow Fuse 4A/250V
Vin(max)=264
14S471K or 20S471K
Vin(max)=305
14S561K or 20S561K
Vin(max)=264
14S471K or 20S471K
Vin(max)=305
14S561K or 20S561K
Vin(max)=264
14S471K or 20S471K
Vin(max)=305
14S561K or 20S561K
X Capacitor
0.1uF~0.68uF 300V X1
http://www.archcorp.com.tw
TEL: +886-2-26989508 FAX: +886-2-26981319
10~50mH
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Encapsulated AC-DC Converter
APPLICATION NOTE
Item
7
Location
D1
Description
TVS (Vout=3.3V)
SMBJ5.0A or 600W↑ (Peak)
TVS (Vout=5V)
SMBJ7.0A or 600W↑ (Peak)
TVS (Vout=9V)
SMBJ12A or 600W↑ (Peak)
TVS (Vout=12V)
SMBJ20A or 600W↑ (Peak)
TVS (Vout:15V)
SMBJ20A or 600W↑ (Peak)
TVS (Vout=24V)
SMBJ30A or 600W↑ (Peak)
TVS (Vout=48V)
SMBJ64A or 600W↑ (Peak)
8
CY1
Y Capacitor
220pF~4700pF
250V Y2
9
CY2
Y Capacitor
220pF~4700pF
250V Y2
10
RT1
Φ8~Φ20 10R
11
L2
3.3uH~100uH
12
L3
3.3uH~100uH
13
C2
Aluminum
47uF or 47uF↑
14
C3
Soild Capacitor
0.1uF
15
SA1
Surge absorber (Vout=5VDC)
3KV
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TEL: +886-2-26989508 FAX: +886-2-26981319
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