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参数资料
| 型号： | PT4483A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 100 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | HORIZONTAL THROUGH HOLE-26 |
| 文件页数： | 4/8页 |
| 文件大小： | 177K |
| 代理商： | PT4483A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4483
Configuring PT4483 DC/DC Converters
for N+1 Operation
‘N+1’ vs OR’ing
The PT4483 DC/DC converter modules may be
operated with other PT4483 modules in ‘N+1’
configurations. A simple OR’ing connection allows
a number of converters to share the load current. An
‘N+1’ configuration adds redundancy by employing
at least one more converter than is necessary to
supply the load. This ensures that upon the loss of
one converter, sufficient capacity remains to supply
the load without interruption. As an example, a 29-A
load configured for ‘N+1’ would require no less than
three PT4483 converters. Two are needed to meet
the load demand, plus one additional converter to
ensure redundancy. Figure 1-1 shows the schematic
for operating two PT4483 converters in an ‘N+1’
configuration for a 15-A load application.
Blocking Diodes
A true ‘N+1’ redundant system must also protect the
output bus against fault current back-feeding a con-
verter. Without a blocking diode, a converter will sink
current as a result of a fault at its output, or due to the
loss of its input source. The blocking diodes 4, (D1
PT4483
1
2
8–13
20
7
REMOTE SENSE (+)
REMOTE SENSE (–)
PROGRAMMING PINS
3
C
OUT, 150F
(Required)
+
18–13
14–19
25
24
23
22
14–19
2
626
20
626
7
REMOTE SENSE (+)
22
23
24
25
3
PROGRAMMING PINS
D
2, OR'ing Diode
(Required)
–V
IN
+V
IN
15-A
LOAD
Inhibit
–V
OUT
+V
OUT
+V
IN
–V
IN
+V
OUT
–V
OUT
VID4 – VID1
+Sns
–Sns
Share
Sync
Inhibit
–Sns
Share
Sync
Inhibit
+Sns
+V
IN
–V
IN
+V
OUT
–V
OUT
VID4 – VID0
C
IN
+
C
IN
+
D
1, OR'ing Diode
(Required)
F1
F2
C
OUT, 150F
(Required)
+
Figure 1-1; Connection Schematic for Operation in Parallel/N+1 Configuration
& D2 in Figure 1-1), protect against reverse current
flow under such conditions.
Notes
1. For ‘N+1’ redundancy, always use one more
converter than is required to supply the load.
2. The VID pins for all converter modules must be
independently set to the same voltage program code.
3. All converters connected for ‘N+1’ operation
must be located on the same printed circuit
board. A similar footprint and trace layout for
each converter will facilitate current sharing.
4 A number of high-current rectifier diodes are
available with a low forward voltage drop. They
are specifically designed for OR’ing applications
in ‘N+1’ systems. Eg. The 82CNQ030, and
MBRB2515.
5. As a result of excess capacity and the losses in the
blocking diodes, system efficiency is reduced.
6. The interconnection of pin 6 (Sync), and pin 26
(Share) between all modules are required for load
current sharing and operation at a common
frequency.
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