BD5461GUL Datasheet, PDF (5/16 Pages) Rohm – 2.5W Monaural Class-D Speaker Amplifier for Differential Analog Input

BD5461GUL
Technical Note
●Evaluation board Circuit Diagram
VDD
C3
10μ
Differential
Input
H：Active
L：Shutdown
U1
S1
STBY
C2
VDD _B1
B2 PVDD
Bias
OSC
Audio
Input+
Audio
Input-
0.1μ
C2
0.1μ
C1
300k
IN+ _Rin=75k
A1
IN-
C1
Rin=75k
PWM
H-
Bridge
GND _A2
B3 PGND
Please connect to GND line.
Please connect to Power Supply
(VDD=+2.5～5.5V) line.
OUT-
A3
OUT+
C3
Please connect to Input Signal line.
●Evaluation board Parts List
Qty. Item
2
C1, C2
1
C3
1
S1
1
U1
1
PCB1
Please connect to Speaker.
Description
SMD Size
Capacitor, 0.1μF
0603
Capacitor, 10μF
A (3216)
Slide Switch
IC, BD5461GUL,
Mono Class-D audio amplifier
Printed-circuit board,
BD5460GUL EVM
4mm X 10.2mm
1.6mm X 1.6mm
WLCSP Package
―
Manufacturer/
Part Number
Murata
GRM188R71C104KA01D
ROHM
TCFGA1A106M8R
NKK
SS-12SDP2
ROHM
BD5461GUL
―
●Description of External components
① Input coupling capacitor (C1,C2)
It makes a Input coupling capacitor 0.1µF.
Input impedance is 75kΩ (Typ.).
It sets cutoff frequency fc by the following formula by input coupling capacitor C1(=C2) and input impedance Ri.
fc

1
[Hz]
2 π Ri C1
In case of Ri=75kΩ, C1 (=C2)=0.1µF, it becomes fc = about 21 Hz.
② Power decoupling capacitor (C3)
It makes a power decoupling capacitor 10 µF.
When making capacitance of the power decoupling capacitor, there is an influence in the Audio characteristic.
When making small, careful for the Audio characteristic at the actual application.
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5/15
2009.07 - Rev.A