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參數(shù)資料
| 型號： | 722 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Dual Isolated DC/DC Converter(雙路隔離DC/DC變換器) |
| 中文描述： | 雙隔離式DC / DC轉(zhuǎn)換器（雙路隔離的DC / DC變換器） |
| 文件頁數(shù)： | 5/5頁 |
| 文件大小： | 84K |
| 代理商： | 722 |
722
5
DISCUSSION
OUTPUT CURRENT RATINGS
At rated output voltage accuracy, the 722 is capable of
providing 64mA divided among its four outputs
(1)
. A mini-
mum average output current of 3mA is recommended at
each output to maintain voltage accuracy.
Output channels
(2)
may be connected in series or parallel for
higher output voltage or current.
ISOLATION CONFIGURATIONS
The fact that the two outputs of the 722 are isolated from the
input and from each other allows both two-port and three-
port isolation connections.
Figure 1 shows Burr-Brown’s 3650 optically coupled isola-
tion amplifier connected in three-port configuration. One of
the 722 channels provides power to the 3650’s input. The
other channel supplies power to the 3650’s output. The
amplifier’s input and output are isolated from each other and
the system’s power supply common. In this configuration,
the 722’s channel-to-channel isolation specification applies
to the amplifier input-to-output voltage.
NOTES: (1) “Output” denotes a single output terminal
(+V or –V) and its associated common. (2) “Channel”
denotes a pair of outputs (+V and –V) and their
associated common.
FIGURE 1. Three-Port Isolation.
Figure 3 illustrates how the 722 may provide isolated input
power to the input stage of two 3650’s connected in the two-
port configuration. Power for the output stage is provided by
the system +15V and –15V supplies. Input stages are iso-
lated from each other and from the system supply. In this
situation, the 722’s input-to-output isolation specification
applies to the amplifier’s input-to-output voltages, while the
channel-to-channel 722 specification applies to the voltage
existing between “I/P Com #1” and “I/P Com #2.”
SHORT CIRCUIT PROTECTION
The circuit in Figure 2 may be added to the input of the 722
to protect it from damage in situations where too much
current is demanded from the outputs—such as a short
circuit from an output to its common. The circuit limits input
current to approximately 150mA for an input voltage of
15VDC (for of 2N2219 of 50).
FIGURE 2. Short Circuit Protection.
FIGURE 3. Two-Port Isolation with Two 3650’s.
+V
O1
C
1
–V
O1
+V
O2
C
2
–V
O2
P+
V+
E
V–
C
R
1
V
IN
Com
+15V
Power
Supply
Common
O/P
Com
I/P Com
3
722
+V
O1
C
1
–V
O1
+V
O2
C
2
–V
O2
P+
V+
E
V–
C
R
1
V
IN
Com
+15V
O/P Com
O/P Com
3
3
+15V–15V
O/P Com
+15V–15V
I/P
Com #2
I/P
Com #1
722
–15V
+V
O1
C
1
P+
V+
E
V–
R
1
2N2219
V
IN
IN4148
100
+
3.6k
1
–V
O1
+V
O2
C
2
–V
O2
722
–
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