BD5465GUL Datasheet, PDF (11/20 Pages) Rohm – Analog Input Monaural Class-D Speaker Amplifier

BD5465GUL
●Evaluation Board Circuit Diagram
Technical Note
Connect to GND
VDD
VDD
VDD ^B1
C3
10uF
B2 PVDD
Shutdown Signal
SDNB
C2
H： IC Active
L： IC Shutdown
150k
(Typ.)
Shutdown
Control
Audio Input
Audio
Input+
0.1uF
Differential
Input
Audio
Input-
C2
0.1uF
C1
IN+
Ri
A1
IN-
C1
Ri
ALC
Rf
Rf
GND A2
GND
BIAS
OSC
PWM
H-
Bridge
B3 PGND
Connect to Power Supply
(VDD=+2.5～5.5V)
OUT+
C3
OUT-
A3
Connect to input signal
BD5465GUL
Connect to Speaker
* Power Supply terminals VDD(B1), PVDD(B2) are SHORT in the board pattern and use a single power.
●Evaluation Board Parts List
Qty.
Item
2
C1, C2
Description
Capacitor, 0.1μF
1
C3
Capacitor, 10μF
1
S1
Slide Switch
1
U1
IC, BD5465GUL,
Mono Class-D Audio Amplifier
1
PCB1
Printed-Circuit Board,
BD5465GUL EVM
SMD Size
0603
A (3216)
4mm X 10.2mm
1.8mm X 1.8mm
WLCSP Package
―
Manufacturer/
Part Number
Murata
GRM188R71C104KA01D
ROHM
TCFGA1A106M8R
NKK
SS-12SDP2
ROHM
BD5465GUL
―
●About the external part
①Input coupling capacitor (C1, C2)
Input coupling capacitor is 0.1μF.
Input impedance during maximum gain 12dB is 60kΩ (Typ.). A high-pass filter is composed by the input coupling
capacitor and the input impedance.
Cut-off frequency “fc” by the formula below, through input coupling capacitor C1(=C2) and input impedance Ri.
fc

2

1
Ri

C1
ٛHz
In case of Ri=60kΩ, C1(=C2)=0.1μF, cut-off frequency is about 26.5Hz
②Power Supply Decoupling Capacitor (C3)
Power Supply Decoupling Capacitor is 10uF. When the capacity value of Power Supply Decoupling Capacitor is
made small, it will have an influence to the audio characteristics. When making it small, be careful with the audio
characteristics at actual application. ESR (equivalent series resistor) is low enough; please use capacitor with
capacity value of 1μF or more.
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11/19
2010.09 - Rev.A