BA5415A / BA5416
Audio ICs
High-output dual power amplifier
BA5415A / BA5416
The BA5415A and BA5416 are dual power amplifier ICs that operate off a 9V to 15V supply. When driving a 4Ω load off a
9V supply, the BA5415A does not require a heatsink. The BA5416 uses a lost-cost package. The basic characteristics
(total harmonic distortion etc.) of the amplifiers are excellent, and both ICs include a standby switch function.
!Application
Radio cassette players.
!Features
1) High output.
P
OUT
= 5.4W (V
CC
= 12V, R
L
= 3Ω and THD = 10%)
P
OUT
= 2.5W (V
CC
= 9V, R
L
= 4Ω and THD = 10%)
2) Excellent audio quality.
THD = 0.1% (f = 1kHz, P
O
= 0.5W)
V
NO
= 0.3mV
rms
(Rg = 10kΩ)
RR = 60dB (f
RR
= 100Hz)
3) Wide operating power supply voltage range.
V
CC
= 5.0V to 18.0V (BA5416 : 5.0V to 15.0V)
4) Switching noise (“pop” noise) generated when the
power is switched on and off is small.
5) Ripple mixing when motor starts has been prevented.
6) Built-in thermal shutout.
7) Built-in standby switch.
Output is not influenced by the standby pin voltage.
8) “On” mute time does not depend on V
CC
.
9) Soft clipping.
10) Heatsink not required
(for BA5415A, with V
CC
= 9V and R
L
≥
4Ω).
!
Absolute maximum ratings
(Ta=25°C)
Parameter
Power supply voltage
Symbol
V
CC
Limits
24
20
∗
1
∗
2
Unit
V
BA5415A
Power dissipation
Pd
BA5416
4.0
∗
3
15
∗
4
W
Operating temperature
Storage temperature
Topr
Tstg
−25
~
+75
−55
~
+150
°C
°C
∗1
Within ASO.
∗2
Ta
=
75°C (see Fig.10).
∗3
Reduced by 40mW for each increase in Ta of 1°C over 25°C.(without radiation board)
∗4
Ta
=
75°C (see Fig.11).
!
Recommended operating conditions
(Ta=25°C)
Parameter
Power supply voltage
∗
When BA5416 is 15V.
Symbol
V
CC
Min.
5
Typ.
12
Max.
18
∗
Unit
V
BA5415A / BA5416
Audio ICs
!
Block diagram
T.S.D
GND
+
−
V
CC
BS
+
−
ST.BY
FILTER
BS
1
2
3
4
5
6
7
8
9
10
11
12
!
Internal circuit configuration
V
CC
3/10
8k
B.S
7 Filter
76k
5/8 IN
I
BIN
44k
2/11
OUT
6 ST . BY SW
50k
I
SIN
50k
4/9
NF
GND12
BA5415A / BA5416
Audio ICs
!
Electrical characteristics
(unless otherwise noted, Ta=25°C, Vcc=12V, R
L
=3Ω, R
F
=240Ω, Rg=600Ω and f=1kH
Z
)
Parameter
Quiescent current
Maximum output voltage
Rated output power 1
Rated output power 2
Closed loop voltage gain
Output noise voltage
Total harmonic distortion
Ripple rejection ratio
Crosstalk
Circuit current (with stanby switch off)
Stanby pin current when on
Input bias current
Symbol
I
Q
P
OM
P
OUT1
P
OUT2
G
VC
V
NO
THD
RR
CT
I
OFF
I
SIN
I
BIN
Min.
−
−
4.5
2.0
43
−
−
45
45
−
−
−
Typ.
28
8.3
5.4
2.5
45
0.3
0.1
60
60
0
0.3
0.1
Max.
45
−
−
−
47
1.0
0.7
−
−
−
−
0.5
Unit
mA
W
W
W
dB
mV
rms
%
dB
dB
µA
mA
µA
V
ST.BY
=V
CC
Rg=0Ω
V
IN
=0V
rms
Conditions
V
IN
=−20dBm
THD=10%
THD=10%, V
CC
=9V,
R
L
=4Ω
Rg=10kΩ, DIN AUDIO
P
OUT
=0.5W
f
RR
=100H
Z
, V
RR
=−10dBm
V
O
=0dBm
!
Measurement circuit
T. S. D
+
FILTER
ST. BY
+
GND
BS
4
5
6
7
+
8
9
10
+
11
12
47µ
+
0.1µ
−
V
CC
−
BS
1
2
47µ
+
3
100µ
RF
33k
33k
1000µ
+
RF
0.1µ
∗SW.
RL
47µ
47µ
+
+
V
CC
+
1000µ
∗
V
ST.BY
=3V~V
CC
Fig.1
RL
1000µ
BA5415A / BA5416
Audio ICs
!
Application examples
OTL Application circuit example
V
CC
+
0.1µ
ST.BY
6
1
3
+
5
33k
+
47µ
+
100µ
47µ
+
240
8
33k
9
44k
7
44k
240
4
47µ
0.1µ
1000µ
+
−
2
+
1000µ
−
+
11
1000µ
+
47µ
+
10
12
GND
Fig.2
BTL Application circuit example
about
90µA
(at 5V)
µ−COM
V
CC
+
0.1µ
1000µ
6
1
3
+
5
33k
+
47µ
+
100µ
47µ
+
33
8
1k
10
12
GND
9
44k
44k
270
4
47µ
0.1µ
ST.BY
+
−
2
+
1000µ
−
+
11
1000µ
+
47µ
+
Fig.3
RL
7
RL
RL
BA5415A / BA5416
Audio ICs
!
Operation notes
(1) Input circuit
The structure of the input circuit is shown in Fig.4. The IC can be used without coupling capacitors, but a maximum of
0.5µA of bias current (I
BIN
) flows from the input pin, so if potentiometer sliding noise results from this, connect an input
capacitor C
IN
as shown below. To prevent degradation of the IC characteristics, the input bias resistor is not built into
the IC. Connect an input bias resistor (R
IN
) between the input and GND (the recommended value is about 33kΩ).
2 / 11
OUT
To next stage
44k
4/9
C
IN
+
R
IN
33k
5/8
IN
12
GND
I
BIN
NF
+
Fig.4
(2) Gain adjustment
The gain is given by the following formula.
G
V
=20log
R
NF
+
R
F
R
F
It is possible to reduce the gain by increasing R
F
, but the amount of feedback will increase, and oscillation will be
more likely to occur. We recommend that you set the gain to 30dB or higher.
IN
5/8
+
C
NF
+
−
OUT
44k
R
NF
2 / 11
RF
NF
4/9
Mute circuit
Fig.5
(3) Oscillation countermeasures
We recommend that the capacitor (C1) connected between the B. S pin and the V
CC
pin for oscillation prevention be
a metal-film component with good temperature and high-frequency characteristics. Ceramic capacitors have poor
temperature characteristics, so if used, allow sufficient oscillation margin. It is also possible to connect a capacitor for
oscillation prevention between the output and GND (C2). The oscillation margin depends on the PCB pattern and the
mounting position of the capacitor. Design your PCB after referring to the application example PCB.
1
Filter circuit
V
CC
C1
3 / 10
BS
+
2 / 11
OUT
C2
R2
47µ
1000µ
Driver
+
RL
12
GND
Fig.6
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