■
■
Fig.10.2
Same Surface
Mount
■
Fig.10.3
Recommended
external circuit
①
Input fuse
：
F11
⑥
Y Capacitors
：
CY1
②
Noise filters
⑦
Output capacitors
Line filter
：
L11
、
L12
Electrolytic capacitor
：
Co
Interphase capacitor
：
CX1
、
CX2
Ceramic capacitor
：
C40
Y capacitor
：
CY2
、
CY3
⑧
FG terminals
③
Input capacitor
：
C11
⑨
Surge Suppression
④
Inrush current limiting resistor
：
TFR1
Varistor
：
SK11
、
SK21
、
SK22
⑤
Capacitor for boost voltage
Surge absorber
：
SA11
Electrolytic capacitor
：
Cbc
⑩
Discharging resistor
：
R1
Film Capacitors
：
C20
、
C30
When installing the electrolytic capacitor and the power supply on the same surface of the printed
circuit board, please pay attention to the distance between the base plate and electrolytic
capacitor. Exterior of the electrolytic capacitor is assumed to be the same potential as the negative
electrode.
High-frequency noise radiates directly from the unit to the atmosphere. Therefore, design the
shield pattern on the printed circuit board and connect to FG. The shield pattern prevents noise
radiation.
There are notes for printed circuit board design at recommended circuit in this applications
manual. Please see below.
A-24
Applications Manual
TUNS300/500/700
Aluminum base plate, Heatsink
：
FG
Electrolytic
capacitor
Peripheral
components
Heatsink
AC1
AC2
+VOUT
-VOUT
-BC
FG
F11
+BC
Co
+
Load
C40
AC
INPUT
L11
CY2
CX1
SK11
SK21
SA11
CX2
CY3
L12
SK22
Noise
Filter
C11
-S
+S
R
+
C30
TFR1
Cbc
C20
CY1
R1
FG
