AEE03A48-97 Astec Power, AEE03A48-97 Datasheet - Page 20

• Manufacturer Part Number: AEE03A48-97
• Manufacturer: Astec Power

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FAX:
USA
1-760-930-4600
1-760-930-0698
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 AEE
low power high efficiency series has an internal
switching frequency of 300 kHz (250 kHz for
AEE01B48), so a high frequency capacitor
mounted close to the input terminals produces
the best results. To reduce reflected noise, a
filter can be added to the input as shown in
Figure 3. The parameters are referred to the
page 3.
For conditions where EMI is a concern, a differ-
ent input filter can be used. Figure 4 shows an
input filter designed to reduce EMI effects. L1
is a 5mH common mode choke.
When a filter inductor is connected in series
with the power converter input, an input capac-
itor C
should also be used when the input wiring is
long, since the wiring can act as an inductor.
Failure to use an input capacitor under these
conditions can produce large input voltage
spikes and an unstable output.
Input Filter
47uF/
100V
4700pF
2000V
4700pF
2000V
1
Fig.3 Ripple Rejection Input Filter
Fig.4 EMI Reduction Input Filter
should be added. An input capacitor C
C
0
A A
A A
1 1
1 1
E E
E E
8 8
8 8
E E
E E
L
V V
V V
1
L
d d
d d
L L
L L
1
c c
C
c c
o o
o o
1
w w
w w
47uF/100V
t t
t t
C
o o
o o
1
P P
+V
P P
-V
Europe
44-(0)1384-842-211
44-(0)1384-843-355
3 3
3 3
o o
in
o o
in
6 6
6 6
w w
w w
V V
+V
V V
-V
e e
e e
d d
d d
in
in
r r
r r
c c
c c
H H
H H
& &
& &
i i
i i
g g
g g
3 3
3 3
h h
h h
6 6
6 6
V V
V V
E E
E E
d d
d d
f f
f f
f f
f f
c c
c c
i i
i i
c c
c c
t t
t t
i i
i i
o o
o o
e e
1
e e
n n
n n
Asia
852-2437-9662
852-2402-4426
7 7
7 7
c c
c c
5 5
5 5
y y
y y
V V
V V
d d
S S
d d
S S
CNT Function
Two CNT logic options are available. The CNT
logic, CNT voltage and the module working
state is as the following Table 2.
N--- means “Negative Logic”
P--- means “Positive Logic”
L--- means “Low Voltage”, -0.7V [ L [ 1.2V
H--- means “High Voltage”, 3V [ H [ 10V
ON--- means “module is on”
OFF--- means “module is off”
Open--- means “ CNT pin is left open ”
Note: The V
The following figure 5 to 8 are a few simple
CNT control circuits.
CNT Function
c c
c c
e e
e e
r r
r r
I I
I I
i i
i i
n n
n n
e e
e e
p p
p p
T
s s
T
s s
u u
able 2
u u
able 2
D D
D D
N
P
t t
t t
, ,
, ,
C C
C C
Fig.6 Transistor Control
www.astec.com
1 1
1 1
Fig.7 Isolated Control
-
-
CNT
Fig.5 Simple Control
D D
5 5
Fig.8 Relay Control
D D
5 5
ON
OFF
ON
OFF
C C
C C
L
W W
1000pF
W W
[ 10V
C C
a a
C C
a a
t t
t t
o o
o o
t t
t t
n n
n n
O O
O O
OFF
ON
OFF
ON
1000pF
v v
v v
u u
H
u u
e e
e e
t t
r r
t t
r r
p p
p p
t t
t t
CNT
-V
e e
e e
u u
u u
in
r r
r r
1000pF
t t
t t
s s
s s
Open
-V
OFF
ON
OFF
ON
CNT
CNT
-V
in
CNT
-V
in
in
-20-