a
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TDK-Lambda
CN-A24 Series
Instruction Manual
11. ON/OFF Control (CNT terminal)
Without turning the input supply on and off, the
output can be enabled and disabled using this function.
This function also can be used for output sequence of
plural power modules.
ON/OFF control circuit is on the primary side (the
input side). For secondary control, isolation can be
achieved through the use of an photo-coupler or relay.
CNT Terminal Level to -Vin Terminal
Output Status
H Level ( 4V
≦
H
≦
35V ) or Open
OFF
L Level ( 0V
≦
L
≦
0.8V ) or Short
ON
Table11-1 CNT Terminal Level
Notes
1. When ON/OFF control function is not used, CNT
terminal should be shorted to –Vin terminal.
2. When using long wiring, for prevention of noise,
attach about 0.1uF capacitor between CNT
terminal and –Vin terminal.
3. At L level, source current from CNT terminal to
–Vin terminal is 0.4mA
‐
0.5mA.
4. The maximum CNT terminal voltage is 35V.
(1)
Output ON/OFF control
Fig.11-1 CNT Connection (1)
(2)
Secondary (output side) control
Fig.11-2 CNT Connection (2)
12. Redundant Operation
Redundant Operation is possible for loads that are
within the maximum one power of module. When one
module is shutdown by the power failure etc., another
one can continue to provide power.
Fig.12-1 Redundant Operation Connection
Note :
In redundant operation, the remote sensing cannot
be done.
13. Parallel Operation
Parallel Operation cannot be used.
14. Series Operation
Series operation is possible for CN-A24 series.
Connections shown in fig. 14-1 and fig. 14-2 are
possible.
Fig.14-1 Series Operation for
High Output Voltage
Fig.14-2
±
Output Series Operation
Fuse
+Vin
-Vin
CNT
Transistor, Relay
or Equivalent
+V
-V
+S
-S
+
-
Load
+V
-V
+S
-S
+V
-V
+S
-S
+
-
Load
+V
-V
+S
-S
Load
+
-
CN-A110
+V
-V
+V
-V
+S
-S
+S
-S
CN-A110
Load
＋
ー
CN-A24
CN-A24