3.2 Wiring input pin
(1) External fuse
■
Fuse is not built-in on input side. In order to protect the unit, install the normal-blow
type fuse on input side.(Recommended fuse current shown by Table3.2.1)
■
When the input voltage from a front end unit is supplied to multiple units, install the
normal-blow type fuse in each unit.
■
When the fuse is open, power good signal is not outputted.
■
It is not necessary to use fuse if it can be protected by the overcurrent protection
function of bus converter on the input side.
Table.3.2.1
External fuse
(2) External capacitor on the input side
■
Install an external capacitor Ci, bVIN and GND input pins for low line-noise
and for stable operation of the power supply.
Table.3.2.2
Recommended
external input capacitor
(Ceramic)
■
Ci is within 5mm for pins. Make sure that ripple current of Ci is less than its rating.
■
When an impedance and inductance level of the input line become higher, the input
voltage may become unstable. In that case, the input voltage becomes stable by
increasing Ci.
(3) Recommendation for noise-filter
■
Install an external input filter as shown in Fig.3.2.1 in order to reduce conducted noise.
Ci is shown in Table.3.2.1
Fig.3.2.1
Example of
recommended external
input filter
BRFS/BRDS 3-2
Applications manual
For BRFS/BRDS series
125A
5
BRFS60/60S,BRDS60/60S
BRFS100,BRDS100
BRFS120,BRDS120
3
100A
BRFS150,BRDS150
No.
Rated current
1
Model
BRFS30/4050/50L,BRDS40
40A
2
60A
80A
4
BRFS150,BRDS150
5
8×22μF
4×22μF
2×22μF
2×22μF
3
BRFS100,BRDS100
4
BRFS120,BRDS120
Rated current
No.
Model
Vin=12V
1
BRFS30/4050/50L,BRDS40
2
BRFS60/60S,BRDS60/60S
Vin=5V