BD5460GUL 查看數據表（PDF） - ROHM Semiconductor
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BD5460GUL Datasheet PDF : 17 Pages
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BD5460GUL
●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
Audio
Input+
0.1μ
C2
STBY
C2
Bias
300k
IN+ Ri=100k
A1
Audio
Input-
0.1μ
IN-
C1
C1
Ri=100k
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 cut-off frequency becomes the following.
fc 1
1
34 kHz
2 π LC 2 π 22 μH 1μF
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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