BD5471MUV 데이터 시트보기 (PDF) - ROHM Semiconductor
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BD5471MUV Datasheet PDF : 22 Pages
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BD5471MUV
Technical Note
●The way of evaluating Audio characteristics
Evaluation Circuit Diagram
C5
10μF
Diff er ent ial
Input
Audio
InputL+
A udio
InpuLt-
0.1μF
C2
INL+
24
0.1μF
C1
INL-
23
Diff er ent ial
Input
Audio
InputR+
Audio
InputR-
0.1μF
C4
INR+
19
0.1μF
C3
INR-
20
G0
Gain
Control
G1
G0
18
G1
17
MUTE
MUTE
7
EAPD
BEEP
0.01μF
EAPD
8
BEEP
1
DET_C
2
C8
H：Active REG_SD
L：Shutdown
REG_S
9
PVDDL REG_VDD
4
10
PVDDR AVDD
15
21
Gain
Select
G0 G1
Gain
Select
G0 G1
G0
150k
G1
150k
PWM
H-
Bridge
ERROR
Short
Short
Protection
PWM
H-
Bridge
ERROR
Short
TSD
UVL
Control
Logic
ERROR
150k
Bias
OSC
150k
150k
BEEP
Detect
REG
150k
3.3V
Short
Protection
12
5
REG_GND PGNDL
14
22
PGNDR AGND
OUTL+ 22μF
3
6
OUTL- 22μF
OUTR 22μF
16
13
OUTR-
22μ F
Measurement Instrument
1μF
RL BTL
1μF
Audio
Precision
etc.
RL=Speaker Load
Measurement Instrument
1μF
RL BTL
1μF
Audio
Precision
etc.
RL=Speaker Load
REG_OUT
11
C7
2. 2μ F
When measuring Audio characteristics, insert LC filter during the output terminal of IC and the speaker load and measure it.
it. Arrange LC filter as close as possible to the output terminal of IC.
In case of L=22μH, C=1μF, the cutoff frequency becomes the following.
fc 1 [Hz]
2π LC
=33.9[kHz]
Use a big current type - Inductor L.
(Reference)
TDK: SLF12575T-220M4R0
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
9/21
2010.06 - Rev.A
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