BA5204F データシートの表示（PDF） - ROHM Semiconductor
部品番号
コンポーネント説明
メーカー
BA5204F Datasheet PDF : 7 Pages
| |||
Audio ICs
FApplication example
BA5204F
FAttached components (Fig. 15)
C1: filter capacitor
The recommended value is 330µF. If this is reduced too
much, the ripple rejection ratio will drop. This capacitor
also sets the muting time when power is applied. Reduce
the value of this capacitor if you wish to shorten the start-
up time. On the other hand, if you wish to reduce the
“pop” noise further, increase the value of this capacitor to
lengthen the startup time.
C2 and C3: bootstrap capacitors
The recommended value is 47µF. If the capacitance is
too small, the IC will not be able to produce its rated pow-
er in the bass region and distortion will increase.
C5 and C6: feedback circuit DC blocking capacitors
These capacitors and RNF set the bass cutoff frequency.
ch1 G G G G fLC1 =
ch2 G G G G fLC2 =
1
2π S C5 S (RNF1)R102)
1
2π S C6 S (RNF2)R202)
RNF1 and RNF2 determine the amount of feedback for the
feedback circuit. These resistors determine the closed-
circuit voltage gain (GVC).
C7 and C8: depending on the PCB design, and output cir-
cuit wiring, feedback may be applied to the IC’s internal
circuits and cause high-frequency oscillation. These ca-
pacitors prevent this from happening. They also increase
the amount of design freedom with regard to the output
wiring and PCB artwork. Design the PCB so that the
length of the wiring from ch1 and ch2 to capacitors and
from the capacitors to GND is as short as possible. Mylar
capacitors of about 0.01µF are appropriate for this ap-
plication, although active capacitors may also be used.
The residual impedance and resonant frequency will dif-
fer depending on the type of capacitor and therefore have
some influence on the effectiveness.
C9 and C10: output coupling capacitors
The recommended value is 220µF. If the capacitance is
too small, the IC will not be able to produce its rated pow-
er in the treble region and distortion will increase.
376
Share Link: 