■
In order to smooth boost voltage, connect Cbc bBC and -BC.
Recommended capacitance of Cbc is shown in Table 2.4.
■
If the capacity is not within the allowable external capacity, the module may be damaged.
■
When operated below 0ºC, operation may become unstable as boost ripple voltage
increases due to ESR characteristics. Choose a capacitor which has higher capacitance
than recommended.
Select a capacitor so that the ripple voltage of the boost voltage is 30 Vp-p or below.
■
If the ripple voltage of the boost voltage increases, the ripple current rating of the
smoothing capacitor may be exceeded. Check the maximum allowable ripple current of
the capacitor.
■
The ripple current changes with PCB patterns, external parts, ambient temperature, etc.
Check the actual ripple current value flowing through Cbc.
■
The boost voltage varies depending on the input voltage. (See item 3.1)
Table 2.4
Recommended
capacitance
Cbc
※
Refer to item 3 and 4 for selection method of Cbc.
Fig.2.4
Ripple current
values
Cbc
※
Ripple current value is the sum of parallel capacitors.
2.6 Smoothing capacitor for boost voltage: Cbc
780u
Ｆ ～
3,300uF
780u
Ｆ ～
2,200uF
A-5
470uF×3 parallel
85
～
305VAC
DC500V
以上
85
～
264VAC
DC420V
以上
470uF×3 parallel
Allowable
capacitance range
Rated voltage
Input voltage
range
Recommended
capacitor
Applications Manual
TUNS1200
0
1000
2000
3000
4000
5000
6000
7000
0
20
40
60
80
100
120
Ripp
le
c
urren
t
［
m
A
rms
］
Output current
［
%
］
100VAC
200VAC
277VAC
