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3.3 Wiring output pin
■
When the BRFS/BRDS series supplies the pulse current for the pulse load,
please install a capacitor Co bVOUT and GND pins.
Fig.3.3.1
Wiring external
output capacitor
Table.3.3.1
Recommended
Co and MAX Co
■
The output ripple voltage may grow big by resonance with Co and ESL of the wiring.,
if resonance frequency and switching frequency are close.
■
Ripple and Ripple Noise are measured, as shown in Fig.3.3.2. Co1, Co2 and Co3 is
shown in Table 3.3.2.
Fig.3.3.2
Measuring method of
Ripple and Ripple Noise
Table.3.3.2
Co1,Co2 and Co3
which is used in
measuring
BRFS/BRDS 3-4
Applications manual
For BRFS/BRDS series
3×100μF
5
BRFS120/150,BRDS120/150
4×101μF
10,000μF
2
2×100μF
3
Recommend Co
10,000μF
4
BRFS100,BRDS100
2×100μF
20,000μF
Maximum Co
BRFS50/50L
10,000μF
BRFS60,BRDS60
10,000μF
No.
Model
1
BRFS30/40/60S,BRDS40/60S
4×100μF