BD5471MUV Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BD5471MUV Datasheet PDF : 22 Pages
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BD5471MUV
●Evaluation board Parts List
Qty.
Item
Description
1
C1
Capacitor, 0.01μF
1
C2
Capacitor, 2.2μF
2
C3, C4,C6,C7 Capacitor, 0.1μF
1
C5, C8
Capacitor, 10μF
IC, BD5471MUV,
1
U1
Stereo Class-D audio
amplifier
1
PCB1
Printed-circuit board,
BD5471MUV EVM
SMD Size
1608
1608
1608
A (3216)
4.0mm X 4.0mm
VQFN Package
―
Technical Note
Manufacturer/Part Number
Murata
GRM188R71C103KA01D
Murata
GRM188R61C225KE15D
Murata
GRM188R71C104KA01D
ROHM
TCFGA1A106M8R
ROHM
BD5471MUV
―
●The relation in the gain setting and input impedance Ri
The gain setting terminal (G0,G1)
G0
G1
Gain[dB]
L
L
6
L
H
12
H
L
18
H
H
24
Ri [Ohm]
90k
60k
36k
20k
●Description of External parts
①Power down timing capacitor (C1)
It’s the capacitor which adjusts time from BEEP signal stop to amplifier stop.
Turn off time Toff is set the following formula.
Toff C1 0.8VDD [ms]
5μ
②Regulator output capacitor(C2)
Output capacitor of 3.3V regulator.
Use capacitance equal to or more than 1uF.
③Input coupling capacitor Ci (C3,C4, C6,C7)
It makes an Input coupling capacitor 0.1uF.
Input impedance Ri in each gain setting becomes the above table.
In 18dB gain setting, it is Ri=36kΩ(Typ.).
It sets cutoff frequency fc by the following formula by input coupling capacitor Ci (C3,C4, C6,C7) and input impedance Ri
fc
1
[Hz]
2π Ri Ci
In case of Ri=36kΩ, Ci=0.1uF, it becomes fc=about 44Hz.
④The power decoupling capacitor (C5,C8)
It makes a power decoupling capacitor 10uF.
When making capacitance of the power decoupling capacitor small, there is an influence in the Audio characteristic.
When making small, careful for the Audio characteristic at the actual application.
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7/21
2010.06 - Rev.A
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