Download High-output dual power amplifier

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.
POUT = 5.4W (VCC = 12V, RL = 3Ω and THD = 10%)
POUT = 2.5W (VCC = 9V, RL = 4Ω and THD = 10%)
2) Excellent audio quality.
THD = 0.1% (f = 1kHz, PO = 0.5W)
VNO = 0.3mVrms (Rg = 10kΩ)
RR = 60dB (fRR = 100Hz)
3) Wide operating power supply voltage range.
VCC = 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 VCC.
9) Soft clipping.
10) Heatsink not required
(for BA5415A, with VCC = 9V and RL ≥ 4Ω).
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Limits
VCC
24
Power supply voltage
20
BA5415A
V
∗2
4.0 ∗3
Pd
Power dissipation
Unit
∗1
15
BA5416
W
∗4
Operating temperature
Topr
−25~+75
°C
Storage temperature
Tstg
−55~+150
°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
Min.
Typ.
Max.
VCC
5
12
18
∗
Unit
V
BA5415A / BA5416
Audio ICs
!Block diagram
T.S.D
GND
−
−
VCC
FILTER
+
ST.BY
+
BS
BS
1
2
3
4
5
6
7
8
9
10
11
12
!Internal circuit configuration
VCC
3/10
B.S
8k
7 Filter
2/11
76k
5/8 IN
44k
IBIN
OUT
6 ST . BY SW
50k
ISIN
50k
GND12
4/9
NF
BA5415A / BA5416
Audio ICs
!Electrical characteristics (unless otherwise noted, Ta=25°C, Vcc=12V, RL=3Ω, RF=240Ω, Rg=600Ω and f=1kHZ)
Parameter
Quiescent current
Symbol
Min.
Typ.
Max.
Unit
IQ
−
28
45
mA
Conditions
VIN=0Vrms
POM
−
8.3
−
W
VIN=−20dBm
Rated output power 1
POUT1
4.5
5.4
−
W
THD=10%
Rated output power 2
THD=10%, VCC=9V, RL=4Ω
Maximum output voltage
POUT2
2.0
2.5
−
W
Closed loop voltage gain
GVC
43
45
47
dB
Output noise voltage
VNO
−
0.3
1.0
mVrms
Total harmonic distortion
THD
−
0.1
0.7
%
POUT=0.5W
RR
45
60
−
dB
fRR=100HZ, VRR=−10dBm
Crosstalk
CT
45
60
−
dB
VO=0dBm
Circuit current (with stanby switch off)
IOFF
−
0
−
µA
Stanby pin current when on
ISIN
−
0.3
−
mA
VST.BY=VCC
Input bias current
IBIN
−
0.1
0.5
µA
Rg=0Ω
Ripple rejection ratio
Rg=10kΩ, DIN AUDIO
!Measurement circuit
−
−
VCC
ST. BY
FILTER
+
BS
BS
6
5
VCC
33k
RF
9
10
+
11
12
+
47µ
+
+
1000µ
∗ VST.BY=3V~VCC
Fig.1
+
RL
47µ
+
47µ
∗SW.
0.1µ
0.1µ
RL
1000µ
+
8
7
1000µ
4
RF
3
47µ
+
33k
2
100µ
1
GND
T. S. D
+
BA5415A / BA5416
Audio ICs
!Application examples
OTL Application circuit example
VCC
+
0.1µ
1000µ
ST.BY
0.1µ
1
6
3
+
33k
5
+
4
−
240
+
2
47µ
+
1000µ
RL
47µ
+
44k
7
44k
RL
100µ
47µ
+
−
9
240
11
+
8
1000µ
+
47µ
+
33k
10
12
GND
Fig.2
BTL Application circuit example
VCC
about
90µA
(at 5V)
µ−COM
+
0.1µ
1000µ
ST.BY
0.1µ
1
6
3
+
33k
5
+
4
−
270
+
2
47µ
+
1000µ
47µ
44k
7
RL
+
44k
100µ
47µ
+
9
33
8
−
11
+
1000µ
+
+
1k
10
12
GND
Fig.3
47µ
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 (IBIN) flows from the input pin, so if potentiometer sliding noise results from this, connect an input
capacitor CIN 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 (RIN) between the input and GND (the recommended value is about 33kΩ).
2 / 11
44k
OUT
To next stage
4/9
CIN
+
5/8
IBIN
NF
+
IN
RIN
33k
12
GND
Fig.4
(2) Gain adjustment
The gain is given by the following formula.
GV=20log
RNF + RF
RF
It is possible to reduce the gain by increasing RF, 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
+
CNF
2 / 11
−
RF
OUT
44k
NF
4/9
RNF
Mute circuit
Fig.5
(3) Oscillation countermeasures
We recommend that the capacitor (C1) connected between the B. S pin and the VCC 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.
Filter circuit
1
VCC
C1
3 / 10
+
47µ
1000µ
2 / 11
12
GND
Fig.6
C2
R2
RL
OUT
+
Driver
BS
BA5415A / BA5416
Audio ICs
(4) VCC and GND lines
The Pre. GND and Pow. GND are joined at pin12, so there is a chance of crosstalk or degraded distortion
performance due to common ground impedance in the PCB pattern. In addition, the power supply capacitor
connected between VCC and GND is influenced by the PCB pattern, and common VCC and GND impedance may
degrade the ripple rejection and distortion. Design the PCB after referring to the application example PCB (the
recommended value for the power supply capacitor is 1000µF of greater).
(5) Standby switch
The IC has built-in standby switch (pin6), so the IC can be powered on and off by a switch with low current capacity.
The on voltage V1 can be in the range 3V to VCC, so the standby switch will not adversely influence circuit
characteristics as with conventional methods. This also increases design freedom. At normal temperatures, the
switch operates at a voltage of V1=3V or higher, but we recommend that you use it at 3.5V or higher to allow for low
temperatures. A small “pop” noise may be generated when the power is switched off using the external switch. If this
is the case, connect a capacitor of about C3=0.022µF in parallel with the switch.
C3
Start circuit
6
S1
50k
IN
50k
12
V1
GND
Fig.7
(6) Filter pin
Pin7 is for connection of a ripple filter. The ripple rejection can be increased somewhat by increasing the capacitance,
but this also affects the starting time, so we recommend a value in the range 100µF to 220µF. The standard starting
time is 0.8sec.
1
Start circuit
VCC
7
FILTER
8k
76k
+
Small-signal circuit
100µ
12
GND
Fig.8
(7) Applied voltage
As long as the output power transistor is operated within the ASO (safe operating range Fig.9), the IC can be
operated to its absolute maximum ratings (VCCMax.=24.0V). During normal operation, operate the IC within its
recommended operating voltage range; exceeding this range will result in destruction of the IC. When the standby
switch is off, the IC is guaranteed up to VCCMax.=24.0V, but when the standby switch is on, set the power supply
regulation characteristics (including the capacitance of the power supply capacitor connected between VCC and
GND) so that VCC is 18.0V or less (15.0V or less for the BA5416). If the IC is inserted backwards, VCC and GND will
be reversed and the IC will be destroyed instantly.
CIRCUIT CURRENT
Ic (A)
1.0
0.8
ASO SAMPLE DATA
DC(t=1sec)
Ta=25°C
0.6
0.4
0.2
0
18
20
22
24
SUPPLY VOLTAGE : VCC (V)
Fig.9
26
BA5415A / BA5416
Audio ICs
(8) Thermal shutdown
If the load is shorted or there is insufficient heat dissipation, the thermal shutdown circuit will operate limit the output
and prevent damage to the IC. This occurs when the temperature of the heatsink plate exceeds a temperature of
about 175°C.
(9) Other
Provided the recommended circuit constants are used, the application circuit will function correctly. However, we
recommend that you confirm the characteristics of the circuit in actual use. If you change the circuit constants, check
both the static and transient characteristics of the circuit, and allow sufficient margin to accommodate variations in
both ICs and external components.
(10) Standard values for the DC voltages on each pin (VCC=12V, Ta=25°C, measurement circuit : Fig.1)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
DC (V)
VCC
6.0
10.0
0.6
0.004
VST.BY
10.9
0.004
0.6
10.0
6.0
GND
!Application board patterns
GND
GND
GND (RL)
GND
OUT2
+
RIN
IN2
+
C7
C6
+
C9
C2
R2
C5
+
IN1
RIN
C4
C10
+
+
C8
R1
+
+
C3
C1
BA5415A
ROHM
OUT1
1
ST.BY
Vcc
BA5415A / BA5416
Audio ICs
!Electrical characteristics curves
Pd-Ta
ALUMINUM
A
16
B
C
8
D
4
E
0
0
25
50
75
100
125
150
A
15
B
10
C
5
D
0
0
175
AMBIENT TEMPERATURE : Ta (°C)
TOTAL HARMONIC DISTORTION : THD (%)
40
30
20
RF=240Ω
CNF=47µF
Output pin
Ta=25°C
10k 30k
100k
20
0
0
150
5
2
f=10kHz
1
0.5
100Hz
0.2
1kHz
0.1
0.05
0.01 0.02 0.05 0.1 0.2
0.5 1
2
5
10
20
5
ST.BY PIN CURRENT : ISIN (mA)
10
RL=3Ω
4Ω
8Ω
2
1
THD=10%
f=1kHz
DIN AUDIO
Ta=25°C
BA5416 is up to
VCC=15V.
0.1
0.05
0
4
8
12
16
20
20
24
2
24
POWER SUPPLY VOLTAGE : VCC (V)
Fig.16 Rated output voltage vs.
power supply voltage
100Hz
0.2
0.1
1kHz
0.05
0.01 0.02 0.05 0.1 0.2
0.5 1
2
5
10
OUTPUT POWER : PO (W)
Fig.15 Total harmonic distortion vs.
output power (BA5416)
0.5
VST.BY=VCC
Ta=25°C
0.5
0.4
0.3
0.2
0.1
0
0
f=10kHz
1
0.5
0.6
0.2
15
VCC=12V
RL=3Ω
RF=240Ω
Ta=25°C
BA5416
10
Fig.14 Total harmonic distortion vs.
output power (BA5415A)
20
0.5
10
Fig.12 Quiescent current vs.
power supply voltage
OUTPUT POWER : PO (W)
Fig.13 Closed loop voltage
gain vs.frequency
5
5
POWER SUPPLY VOLTAGE : VCC (V)
VCC=12V
RL=3Ω
RF=240Ω
Ta=25°C
BA5415A
10
FREQUENCY : f (Hz)
RATED OUTPUT POWER : POUT (W)
125
10
INPUT BIAS CURRENT : IBIN (µA)
CLOSED LOOP VOLTAGE GAIN : GVC (dB)
50
1k 3k
100
20
A : INFINITE HEAT SINK θjc=5.0°C/W
B : 100cm2×2.0mm
C : 25cm2×2.0mm
D : WITHOUT HEAT SINK θja=56.8°C/W
60
100 300
75
30
Fig.11 Power dissipation curves
(BA5416)
A : INFINITE HEAT SINK θjc=3.75°C/W
B : 100cm2×1.6mm
C : 50cm2×1.6mm
D : 25cm2×1.6mm
E : WITHOUT HEAT SINK θja=31°C/W
0
10 30
50
VIN=0Vrms
Ta=25°C
40
AMBIENT TEMPERATURE : Ta (°C)
Fig.10 Power dissipation curves
(BA5415A)
10
25
TOTAL HARMONIC DISTORTION : THD (%)
12
QUIESCENT CURRENT : IQ (mA)
ALUMINUM
POWER DISSIPATION : Pd (W)
POWER DISSIPATION : Pd (W)
50
20
20
5
10
15
20
24
POWER SUPPLY VOLTAGE : VCC (V)
Fig.17 Standby pin input current vs.
power supply voltage
Rg=0Ω
Ta=25°C
0.4
0.3
0.2
0.1
0.0
0
4
8
12
16
20
POWER SUPPLY VOLTAGE : VCC (V)
Fig.18 Input bias current vs.
power supply voltage
24
BA5415A / BA5416
Audio ICs
80
0.8
0.6
0.4
0.2
100
300
1k
3k
10k
VCC=12V
RL=3Ω
RF=240Ω
Rg=600Ω
VO=0dBm
Ta=25°C
20
30
100 300
1k
3k
Fig.19 Output noise voltage vs.
signal source resistance
Fig.20 Crosstalk vs.
frequency (BA5415A)
VCC=12V
RL=3Ω
f=1kHz
Ta=25°C
80
60
40
20
0
100
300
1k
3k
10k
80
40
VCC=12V
RL=3Ω
RF=240Ω
Rg=600Ω
VO=0dBm
Ta=25°C
20
30
80
60
50
40
fRR=100Hz
VRR=−10dBm
RF=240Ω
Rg=0Ω
Ta=25°C
30
8
12
16
100 300
1k
3k
10k 30k 100k
Fig.21 Crosstalk vs.
frequency (BA5416)
BA5415A
4
60
FREQUENCY : f (Hz)
70
20
0
30k 50k 100k
BA5416
0
10
10k 30k 100k
FREQUENCY : f (Hz)
20
BA5416
70
60
50
40
fRR=100Hz
VRR=−10dBm
RF=240Ω
Rg=0Ω
Ta=25°C
30
20
0
24
4
8
12
16
20
24
SIGNAL GENERATOR RESISTANCE : Rg (Ω)
POWER SUPPLY VOLTAGE : VCC (V)
POWER SUPPLY VOLTAGE : VCC (V)
Fig.22 Crosstalk vs.signal source
resistance
Fig.23 Ripple rejection vs.power
supply voltage (BA5415A)
Fig.24 Ripple rejection vs.power
supply voltage (BA5416)
80
BA5415A
70
60
50
40 VCC=12V
RL=3Ω
RF=240Ω
30 Rg=0Ω
VRR=−10dBm
Ta=25°C
20
10 30 100 300
1k
3k
10k 30k 100k
80
BA5416
70
RIPPLE RIJECTION : RR (dB)
80
RIPPLE RIJECTION : RR (dB)
CROSSTALK LEVEL : CT (dB)
40
SIGNAL GENERATOR RESISTANCE : Rg (Ω)
100
RIPPLE RIJECTION : RR (dB)
60
0
10
30k 50k 100k
CROSSTALK LEVEL : CT (dB)
1.0
80
BA5415A
RIPPLE REJECTION : RR (dB)
1.2
CROSSTALK LEVEL : CT (dB)
VCC=12V
RL=3Ω
RF=240Ω
DIN AUDIO
Ta=25°C
RIPPLE REJECTION : RR (dB)
OUTPUT NOISE VOLTAGE : VNO (mVrms)
1.4
60
50
40 VCC=12V
RL=3Ω
RF=240Ω
30 Rg=0Ω
VRR=−10dBm
Ta=25°C
20
10 30 100 300
1k
3k
10k 30k 100k
BA5415A
70
60
50
VCC=12V
40 RL=3Ω
RF=240Ω
fRR=100Hz
30 VRR=−10dB
DIN AUDIO
Ta=25°C
20
10
300
1k
3k
10k
30k
100k
FREQUENCY : f (Hz)
FREQUENCY : f (Hz)
SIGNAL GENERATOR RESISTANCE : Rg (Ω)
Fig. 25 Ripple rejection vs.
frequency (BA5415A)
Fig.26 Ripple rejection vs.
frequency (BA5416)
Fig.27 Ripple rejection vs.
signal source
resistance (BA5415A)
BA5415A / BA5416
70
60
50
VCC=12V
40 RL=3Ω
RF=240Ω
fRR=100Hz
30 VRR=−10dB
DIN AUDIO
Ta=25°C
20
300
10
1k
3k
10k
30k
100k
SIGNAL GENERATOR RESISTANCE : Rg (Ω)
RL=3Ω
8
Both channels driven
4Ω
6
4
8Ω
2
0
0
4
8
12
16
20
2.4
RL=3Ω
Both CH
10 drive
8
2.0
1.6
Pd (VCC=15V)
ICC
6
1.2
12V
4
0.8
9V
2
0.4
0
0.1
24
0.2
0.5
1
2
5
Fig.30 Power dissipation and current
dissipation vs.power
supply voltage (RL=3Ω)
2.4
RL=4Ω
Both CH
10 drive
2.0
8
1.6
Pd (VCC=15V)
ICC
1.2
12V
4
0.8
9V
2
0.4
0.2
0.5
1
2
0.0
10
5
OUTPUT POWER : Pd (W)
Fig.31 Power dissipation and current
dissipation vs.power
supply voltage (RL=4Ω)
!External dimensions (Units : mm)
BA5415A
BA5416
30.0±0.3
3.0±0.2
28.5±0.2
4.7±0.2
29.8±0.2
R1.6
12
0.6
2.54
1.2
SIP-M12
0.4±0.1
9.4±0.3
14.8±0.3
4.2±0.5
1.2
12.35±0.3
20.2±0.5
13.9±0.3
1.2
7.0±0.1
6.5±0.5
21.6±0.5
6.9±0.1
R1.8
1
8.0±0.3
0.5
24±0.1
1
0.0
10
OUTPUT POWER : PO (W)
CIRCUIT CURRENT : ICC (A)
POWER DISSIPATION : Pd (W)
10
Fig.29 Maximum power
dissipation vs.
power supply voltage
12
0
0.1
12
POWER SUPPLY VOLTAGE : VCC (V)
Fig.28 Ripple rejection vs.
signal source
resistance (BA5416)
6
12
12
0.6±0.1
2.54
0.6
0.8
1.3
HSIP-B12
CIRCUIT CURRENT : ICC (A)
BA5416
POWER DISSIPATION : Pd (W)
RIPPLE REJECTION : RR (dB)
80
MAXIMUM POWER DISSIPATION : PdMAX (W)
Audio ICs