A-26
Applications Manual
TUNS300/500/700
When the fuse is blown out, input voltage would be applied between the terminals of
the fuse F11.
Please keep the distance of the pattern between the terminals of the fuse more than
2.5mm if you must be complied safety approvals.
Noise filter is build by Line filters (L11, L12), X capacitor (CX1, CX2) and Y capacitor
(CY2,CY3). And the Noise filter is used to reduce conduction noise from power supply.
Off-the-shelf Noise filter is also available.
If the Line filter is placed near the components which is switching at high frequency,
the conduction noise may be increased because the noise goes into the Line filter.
Therefore, the Line filter should be shielded or keep the distance from the source
of noise.
The effect of noise reduction by Y capacitor depends on the place of the FG connection.
Recommend connecting Y capacitor to the FG terminal of the power supply as close as
possible. Please evaluate before use.
Huge ripple current flows into the capacitor C11.
Place the capacitor C11 near the power supply as close as possible.
①
Input fuse
：
F11
②
Noise filter
③
Input capacitor
：
C11
×
Not good
○
Good
Power supply
C11
Power supply
C
1
1
CX
C
X
LF
LF
Input
Output
Input
Output
The high voltage(Approx. 380VDC) is appeared bBC,R and -BC terminals.
The distance bBC, R and -BC terminals must be 3mm or more.
Huge ripple current flows into the capacitor C20. Place C20 near the power supply
as close as possible.
CY1 should be connected to the FG terminal of the power supply as close as possible.
⑤
Capacitor for boost voltage
：
Cbc,C20
R pin connected capacitor
：
C30
⑥
Y Capacitors
：
CY1
④
Inrush current limiting resistor
：
TFR1
Inrush current will flow through the Cbc TRF1 from the R pin. Please have a pattern
width that is not damaged by the inrush current.
