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AV45C Datasheet(PDF) 16 Page - Astec America, Inc

Part # AV45C
Description  1.5V, 1.8V, 3.3V, 5V Single Output 48V Input, 100W DC-DC Converter
PDF  25 Pages
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Manufacturer  ASTEC [Astec America, Inc]
Direct Link  http://www.astecinc.com/
Logo ASTEC - Astec America, Inc

AV45C Datasheet(HTML) 16 Page - Astec America, Inc

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-16-
USA
Europe
Asia
TEL:
1-760-930-4600
44-(0)1384-842-211
852-2437-9662
FAX:
1-760-930-0698
44-(0)1384-843-355
852-2402-4426
www.astec.com
Pin Location
Pin Location
The +Vin and -Vin input connection pins are
located as shown in Figure 1. AV45C series
converters have a 2:1 input voltage range and
can accept 36-75 Vdc input.
Care should be taken to avoid applying
reverse polarity to the input which can dam-
age the converter.
Input Characteristic
Input Characteristic
Fusing
Fusing
The AV45C power module has no internal
fuse. An external fuse must always be
employed!
To
meet
international
safety
requirements, a 250 Volt rated fuse should be
used. If one of the input lines is connected to
chassis ground, then the fuse must be placed in
the other input line.
Standard safety agency regulations require
input fusing. Recommended fuse ratings for the
AV45C quarter-brick are shown in Table 1.
Note: the fuse is normal blow type.
Input Reverse V
Input Reverse Voltage Protection
oltage Protection
Under installation and cabling conditions where
reverse polarity across the input may occur,
reverse polarity protection is recommended.
Protection can easily be provided as shown in
Figure 2. In both cases the diode rating is deter-
mined by the power of the converter.
Placing the diode across the inputs rather
than in-line with the input offers an advan-
tage in that the diode only conducts in a
reverse polarity condition, which increases
circuit efficiency and thermal performance.
Input Undervoltage Protection
Input Undervoltage Protection
The AV45C quarter-brick series is protected
against undervoltage on the input. If the input
voltage drops below the acceptable range, the
converter will shut down. It will automatically
restart when the undervoltage condition is
removed.
Input Filter
Input Filter
Input filters are included in the converters to
help achieve standard system emissions certifi-
cations. Some users however, may find that
additional input filtering is necessary. The
AV45C quarter-brick series has an internal
switching frequency of 250 kHz so a high fre-
quency capacitor mounted close to the input
terminals produces the best results. To reduce
reflected noise, a capacitor can be added
across the input as shown in Figure 3, forming
-Vin
CNT
+Vin
-Vo
-Sense
TRIM
+Sense
+Vo
Fig.1 Pins Location ( Pin-side View )
T
Table 1
able 1
Series
Fuse Rating(48Vin)
AV45C 5Vout
10A (Pout=100W)
AV45C 3.3Vout
8A (Pout=66W)
AV45C 1.8Vout
5A (Pout=36W)
AV45C 1.5Vout
5A (Pout=30W)
+Vin
-Vin
+Vin
-Vin
Fig.2 Reverse Polarity Protection Circuits



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