BD5461GUL 데이터 시트보기 (PDF) - ROHM Semiconductor
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BD5461GUL Datasheet PDF : 17 Pages
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BD5461GUL
●The way of evaluating Audio characteristic
Evaluation Circuit Diagram
VDD
C3
C4
0.1μ
10μ
VDD
VDD B1
B2 PVDD
Differential
Input
H：Active
L：Shutdown
STBY
C2
Bias
300k
Audio
Input+
0.1μ
IN+ Ri=75k
A1
C2
Audio
Input-
0.1μ IN-
C1
C1
Ri=75k
OSC
PWM
H-
Bridge
GND A2
B3 PGND
Technical Note
OUT- 22μH
A3
OUT+
C3
22μH
Measument Instrumen
-
1μF
Audio
RL BTL
Precision
etc
1μF
+
RL=Speaker Load
When measuring Audio characteristics, insert LC filter during the output terminal of IC and the speaker load and measure 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
1
34 kHz
2 π LC 2 π 22 μH1μF
Use a big current type - Inductor L.
(Reference)
TDK: SLF12575T-220M4R0
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
8/16
2010.06 - Rev.A
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