A-27
Applications Manual
TUNS300/500/700
Connecting the output capacitor (Co,C40) to the power module as close as possible for
stable operation and radiation noise reduction.
The output line impedence could cause unstable output voltage, which can be reduced
by adding the output capacitor close to the load.
When the output ripple and ripple noise must be reduced, ceramic capacitor C40 which
has good characteristics at high frequency should be used.
If through-hole type ceramic capacitor is used, the effect of the noise reduction would be
reduced by the impedance of the lead frame of the components.
Please evaluate before using.
Connect the FG terminal of the power supply to the PWB by screw. If the FG terminals
of the power supply is not connected properly, malfunction or failure could happen.
Expose the solder mask around the hole of the FG connection on the PWB to connect
FG terminals by screws.
⑦
Output capacitors
：
Co, C40
⑧
FG terminals of the power supply
⑨
Surge Suppression
Device：
SK11,SK21,SK22, and SA11
In isolation test, test voltage is applied to the SA11. When the test voltage beyond the
specification of the SA11 is applied, please remove the SA11 during the test, or lower
the test voltage.
Note. When conducting isolation test between the primary and the secondary,
high voltage is applied to SA11,SK11,SK21, and SK22, by the partial pressure of the
Y capacitor.
Please keep distance between electrodes, when using multiple resistors as R1 due to
the power loss dispersion.
In the case of obtaining safety standards, please keep insulation distance
required by the standards.
⑩
Discharging resistor
：
R1
Resistance
PWB Pattern
