¡
The specified ripple and ripple noise are measured by the method
introduced in Fig.2.13.
C1(TUHS25)
SK1
+Vout
+BC
AC1
AC2
-BC
-Vout
F1
R1
Load
Cbc
Co
R
C
Oscilloscope
BW:100MHz
Coaxial Cable
F
50mm
Measuring
board
+
Fig.2.13 Method of Measuring Output Ripple and Ripple noise
¡
When connect the output to FG of an equipment, a noise may be-
come big. The noise can be reduced by connecting external filter
and grounding capacitor on the input side.
C1
+Vout
+BC
AC1
AC2
-BC -Vout
F1
L1
R1
Load
+
Cbc
C11
C12
C13
SK1
Fig.2.14 Recomemended circuit of connect output to FG
3 Function
3.1 Input voltage range
¡
The range is from AC85V to AC264V or DC120V to DC370V
(please see SPECIFICATIONS for details).
¡
In case of less than AC85V or DC120V, it is possible to operate
continuously by input voltage derating as shown in ‟Derating”.
¡
In cases that conform with safety standard, input voltage range is
AC100-AC240V (50/60Hz) and DC120-DC370V.
3.2 Overcurrent protection
¡
Overcurrent protection is built-in and comes into effect over 105%
of the rated current.
Overcurrent protection prevents the unit from short circuit and
overcurrent condition. The unit automatically recovers when the
fault condition is cleared.
¡
When the output voltage drops at overcurrent, the average output
current is reduced by hiccup operation of power supply.
3.3 Overvoltage protection
¡
The overvoltage protection circuit is built-in and comes into effect
at 110% to 160% of the rated output voltage. When the load fac-
tor is less than 30%, output voltage may be increased more than
maximum voltage depending on the failure mode.
¡
Please note that devices inside the power supply might fail when
voltage more than rated output voltage is applied to output pin of
the power supply. This could happen when the customer tests the
overvoltage performance of the unit.
3.4 Isolation
¡
For a receiving inspection, such as Hi-Pot test, increase (de-
crease) the voltage gradually for a start (shut down). Avoid using
Hi-Pot tester with timer because it may generate voltage a few
times higher than the applied voltage, at ON/OFF of a timer.
3.5 Reducing standby power
¡
A circuit reducing standby power is built in TUHS.
(standby power of AC100V input : 0.5W max)
The load factor: Io=0-30%, the internal switch element is intermit-
tent operated, and the switching loss is decreased. The speci-
fication of the Ripple/Ripple Noise changes by this intermittent
operation. The value of the ripple/ripple Noise when intermittent
operates changes in the input voltage and the output current.
Please contact us for details.
AC-DC Power Supplies PCB Mount Type
Instruction Manual
TUHS-18
June 26, 2020
