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參數(shù)資料
| 型號： | PWS740 |
| 英文描述： | Distributed Multi-Channel Isolated DC-TO-DC CONVERTER |
| 中文描述： | 分布式多通道隔離型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 117K |
| 代理商： | PWS740 |
PWS740
7
Isolation
Amplifier
ISO102
(3)
5
6
7
12
11
10
9
16
A
A
V
O
O
+15V
(1)
–15V
(1)
Gnd1
0.1μF
24
1
4
13
–15V
12
14
4
13
Input
From
Other 7
Channels
1
8
GND
System Uses:
1 Oscillator/Driver
8 Transformers
8 Bridges
8 ISO102s
1 Multiplexer
Not all components are shown.
14
3
–15V
22
21
Offset
NOTES: (1) Supplies ±15mA of isolated supply current per channel.
(2) WestCap DKM-10 or equivalent. (3) Or ISO120 or ISO122.
2
V 1
10
0.1μF
10μH
(2)
0.3μF2
1
6
5
0.3μF
V
20μH
10μF
0.3μF
+15V
4
8
6
3
5
PWS740-1
T
O
T
O
+V
IN
3
4
0.3μF
PWS740-2
Switch Power to
Other 7 Channels
+
16
MPC8S
Multiplexer
1
(
BAV99
BAV99
FIGURE 3. Low Cost Eight-Channel Isolation Amplifier Block with Channel-to-Channel Isolation.
Critical consideration should go to minimizing electromag-
netic radiation from the switching signal’s lines. T
O
and T
O
.
You can identify the path of the switching current by starting
at the +V
IN
pin. The dynamic component of the current is
supplied primarily from the bypass capacitor. The high
frequency current flows through the inductor and down the
V
DRIVE
line, through one side of the transformer windings,
returning in the T
O
with the “on” FET switch, and then back
up through the bypass capacitor. This current path defines a
loop antenna which transmits magnetic energy. The mag-
netic field lines reinforce at the center of the loop, while the
field lines reinforce at the center of the loop, while the field
lines from opposite points of the loop oppose each other
outside the loop. Cancellation of magnetic radiation occurs
when the loop is collapsed to two tightly spaced parallel line
segments, each carrying the same current in opposite direc-
tions. For this reason, the printed circuit traces for both T
O
connections should lay directly over a power plane forming
the V
DRIVE
connection. This plane need not extend much
wider than T
O
and T
O
. All of the current in the plane will
flow directly under the T
O
traces because this is the path of
least inductance (and least radiation).
Another potential problem with the T
O
lines is electric field
radiation. Fortunately, the V
DRIVE
plane is effective at termi-
nating most of the field lines because of its proximity to
these lines. Additional shielding can be obtained by running
ground trace(s) along the T
O
lines, which also facilitate
minimum loop area connections for the transformer’s center
tap bypass capacitors.
The connections between the secondary (output side) of the
transformer and the diode bridges should be kept as short as
possible. Unnecessary stray capacitance on these lines could
cause tuned circuit peaking to occur, resulting in a slight
increase of output voltage.
The PWS740 is intended for use with the ISO102, ISO120
or ISO122 isolation amplifiers (see Figure 3). Place the
PWS740-2 transformer on the V
OUT
side of the buffer rather
than on the C
1
(bandwidth control) side to prevent possible
pickup of switch signal by the ISO102.
The best ground connection ties the ISO102 output analog
common pin to the PWS740-1 ground pin with a ground
plane. This is where a four-layer board design becomes
convenient. The digital ground of the ISO102 can be con-
nected to the ground plane or closer to the +V supply. If
possible, you should include the analog components that the
ISO102 drives on the same board. For example, if several
ISO102s are multiplexed to an analog/digital converter, then
having all components sharing the same ground plane will
significantly simplify ground errors. Avoid connecting
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