■
Install a film capacitor of 2uF or more into C20 and C30.
■
If C20 and C30 are not connected, the power supply or external components could be
damaged.
■
Ripple current flows in. Check the maximum allowable ripple current of the capacitor
when selecting. The frequency of the ripple current is 100 kHz to 200 kHz.
■
Ripple current values flowing into C20 and C30 as listed in Table 2.1 are shown in
Fig.2.5 and Fig.2.6.
■
The ripple current changes with PCB patterns, external parts, ambient temperature, etc.
Check the actual ripple current values flowing through C20 and C30.
■
The boost voltage varies depending on the input voltage. (See item 3.1)
Fig.2.5
Ripple current
values
C20
※
Ripple current value is the sum of parallel capacitors.
Fig.2.6
Ripple current
values
C30
※
Ripple current value is the sum of parallel capacitors.
2.7
Capacitor for boost voltage :C20,C30
A-6
Applications Manual
TUNS1200
0
500
1000
1500
2000
2500
3000
3500
0
20
40
60
80
100
120
Ripp
le
c
urren
t
［
m
A
rms
］
Output current
［
%
］
100VAC
200VAC
277VAC
0
500
1000
1500
2000
2500
3000
3500
0
20
40
60
80
100
120
Ripp
le
c
urren
t
［
m
A
rms
］
Output current
［
%
］
100VAC
200VAC
277VAC
