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TDK-Lambda
CN-A110 Series
Instruction Manual
7. Over Current Protection (OCP)
This power module has built-in OCP function.
When output current is overload conditions, output voltage
lowers. Output will recover when short circuit or overload
conditions are released. OCP setting value is fixed and
therefore, can not be externally adjusted.
Take note that power module might be damaged continuing
output short circuit or over load conditions depending on
thermal conditions
.
For 5V Model Only
Take note, when output voltage drops down below lower side
of adjustment range by output short circuit or over load
conditions, output might be shut down. Output can be
recovered by manual reset of the CNT terminal or by turning
input line off and then turning it on again.
5V Model
OCP(shut down) release input voltage value
: 45VDC and below
8. Over Voltage Protection (OVP)
This power module has built-in OVP function.
OVP set point is relative to the rated output voltage value.
When output voltage exceed OVP set point, output voltage
shut down. OVP setting value is fixed and therefore, can not be
externally adjusted.
When OVP is triggered, output can be recovered by manual
reset of the CNT terminal or by turning input line off and then
turning it on again.
OVP reset input voltage value : 45VDC and below
Verifying OVP function shall be done by increasing output
voltage with external resistor. For verifying OVP function,
avoid applying external voltage to output terminal because this
will cause power module damage.
9. Over Temperature Protection (OTP)
This power module has built-in OTP function. This function
operates and shuts down the output when ambient temperature
or internal temperature of power module abnormally rises.
OTP operates at 105
℃
to 120
℃
baseplate temperature.
OTP can be released when baseplate temperature drops down
approximately to within 80
℃
to 95
℃
. However, take note
that OTP will operate again unless the cause of abnormal heat
of the power module is eliminated.
10. Remote Sensing (+S,
–
S terminal)
Remote sensing terminal is provided to compensate for
voltage drop across the wirings from the power module output
terminal to the load input terminal.
When remote sensing function is not used (local sensing),
short +S terminal to +V terminal and, -S terminal to –V
terminal.
When using remote sensing function, output power of power
module should be within maximum output power. Also, use
within maximum output adjustable voltage at output terminal.
When wire is long, Power Supply operation might be
unstable due to noise. Moreover, please do enough prior
evaluation for remote sensing function by using shielded wire,
twist pair, or parallel pattern.
Fig.10-1 Remote Sensing is used
Fig.10-2 Remote Sensing is not used (Local Sensing)
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 opto-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
+
V
-
V
+
S
-
S
+
-
Load
CN
-
A
110
C
2
Stabilize the output voltage at load
C
3
+V
-V
+S
-S
+
-
Load
CN-A110
Stabilize the output voltage at output
C2
C3
