Ordering number : EN8307
Monolithic Linear IC
LA47516
Overview
Four-Channel 50W BTL Power Amplifier
for Car Stereo Systems
The LA47516 is a four-channel 50W BTL power amplifier IC for car stereo systems. The output stage uses a pure
complementary format with a V-PNP transistor on the upper side and an NPN transistor on the lower side, making it
possible to obtain high power output and excellent sound quality.
This IC features an extensive set of functions required in car audio systems, including a standby switch, muting function,
and a full complement of protection circuits.
Features
•
Maximum output : 50W×4 (at V
CC
= 14.4V, R
L
= 4Ω)
•
Very low external component count
Functions
•
On-chip offset detector
•
Electrically driven mirror noise countermeasure pin provided
•
Mute function
•
Standby switch
•
Full compliment of protection circuits (including shorting to the power supply, shorting to ground, load short-circuit,
overvoltage, thermal protection)
Usage Notes
Note 1 : This IC must not be connected incorrectly. Incorrect connection can lead to damage to or destruction of the IC.
Note 2 : The protection circuits can temporarily prevent damage to the IC from abnormal states such as incorrect output line connections,
but they cannot guarantee that the IC will not be destroyed.
In particular, these protection circuits do not function outside the guaranteed operating ranges, and incorrect connection of the
outputs can lead to destruction of the IC.
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
VCC max1
VCC max2
Conditions
No signal, t = 1 minute
With signal
Ratings
26
18
Unit
V
V
Continued on next page.
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before usingany SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
N1506 MS PC B8-8425 No.8307-1/7
LA47516
Continued from preceding page.
Parameter
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Junction-to-case thermal resistance
Symbol
IO peak
Pd max
Topr
Tstg
θj-c
With a infinity large heat sink (See note.)
Conditions
Ratings
4.5
50
-40 to +85
-40 to +150
1
Unit
A
W
°C
°C
°C/W
Note : Power consumption (Pd), junction-to-case thermal resistance (θj-c), heat sink thermal resistance (θf), junction
temperature (Tj), case temperature (Tc), and ambient temperature (Ta) have the relationship shown in the
following equation.
Tj = Pd (θj-c+θf) +Ta
= Pd×θj-c+Tc,
*Tc = Pd×θf+Ta However, Tj max is limited by Tstg max (150°C).
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Recommended load resistance
Operating supply voltage range
Symbol
VCC
RL
VCC op
Pd max shall not be exceeded.
Conditions
Ratings
14.4
4
9 to 18
Unit
V
Ω
V
Electrical Characteristics
at Ta
=
25°C, VCC = 14.4V, f = 1kHz, RL = 4Ω, Rg = 600Ω
Parameter
Quiescent current
Standby current
Output offset voltage
Voltage gain
Voltage gain difference
Output power
Symbol
ICCO
Ist
Vn offset
VG
∆VG
PO1
PO max1
PO max2
Total harmonic distortion
Channel separation
Ripple rejection ratio
THD
CHsep
SVRR
THD = 10%
VCC = 13.7V, VIN = 2.5Vrms
VIN = 2.5Vrms
PO = 4W
VO = 0dBm, Rg = 10kΩ
fr = 100Hz, Vr = 0dBm, Rg = 0
B.P.F = 20Hz to 20kHz
Output noise voltage
Mute attenuation
VNO
Ma
Rg = 0, B.P.F = 20Hz to 20kHz
VO = 20dBm
70
80
90
200
µVrms
dB
55
50
RL =
∞,
Rg = 0
Vst = 0V
Rg = 0
VO = 0dBm
-150
31
-1
24
29
43
48
0.1
65
70
0.4
32
Conditions
min
Ratings
typ
200
max
350
10
+150
33
+1
mA
µA
mV
dB
dB
W
W
W
%
dB
dB
Unit
*0dBm = 0.775Vrms
Package Dimensions
unit : mm (typ)
3236A
60
29.2
25.6
(22.8)
(8.5)
(
2.5)
4.5
Pd max -- Ta
Infinity large heat sink
θj-c
= 1°C/W
Allowable power dissipation, Pd max – W
50
(12.3)
(5.0)
(R1.7)
18.6 max
(14.4)
40
21.7
(11.0)
30
Heat sink (θf = 3.5°C/W)
θj-c+θf
= 4.5°C/W
14.5
0.4
1
(2.6)
(1.0)
0.52
25
3.5
20
4.0
4.2
10
2.0
2.0
No heat sink
θj-a
= 39°C/W
0
--40
--20
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta – ˚C
SANYO : HZIP25
No.8307-2/7
LA47516
Block and Test Circuit Diagram
VCC
+
2200µF
VCC1/2
6
20
VCC3/4
0.022µF
IN 1
0.22µF
+
11
+
+
9
OUT1+
RL 4Ω
--
AC CONT1
+
0.47µF
Protective
circuit
8
1
PWR GND1
OUT1--
--
7
--
0.22µF
+
+
OUT2+
5
RL 4Ω
IN 2
OUT2--
12
+
--
3
PWR GND2
2
ST BY
4
+5V
ST ON
Mute
R.F
47µF
+
10
Standby
switch
Ripple
filter
Mute
circuit
10kΩ
+
3.3µF
Low Level
Mute ON
22
IN 3
0.22µF
+
15
+
+
OUT3+
17
RL 4Ω
--
AC CONT2
+
0.47µF
Protective
circuit
13
--
0.22µF
+
25
OUT3--
--
19
PWR GND3
18
PRE GND
+
21
OUT4+
RL 4Ω
IN 4
14
+
--
23
OUT4--
ON TIME C
+
22µF
16
Muting on/off time
control circuit
PWR GND4
24
Note : The components and constant values in the test circuit are used for confirmation of characteristics and do not
guarantee that the application equipment will be free from malfunction or trouble
No.8307-3/7
LA47516
Description of Operation
1. Standby switch function (pin 4)
The pin 4 threshold voltage is set to 2VBE; the amplifier turns on when Vst = 2.0V or higher, and off when Vst = 0.7V
or lower. Note that pin 4 requires an operating current of 40µA or higher.
Note : Do not ground the output with the Pin 4 voltage at approximately 1.4V. In addition, do not give the Pin 4
voltage a time constant.
2. Muting function
The audio can be muted by connecting pin 22 to ground through a 10kΩ resistance. This sets the IC to the muted state.
The mute time constant is determined by the external capacitor and resistor constants. The recommended external
constants are C = 3.3µF, R = 10kΩ.
3. Oscillation stability
Parasitic oscillation may be induced depending on the board layout.
Countermeasures against oscillation can be taken by adding the following parts.
Note that the following are only examples for reference, and that the optimum capacitance values must be confirmed
in the mounted condition for each set.
•
Connect a Mylar capacitor (0.033µF) between the BTL outputs.
•
Connect a capacitor and a resistor (0.1µF and 2.2Ω in series) between each output and GND.
4. Sound quality (low frequencies)
The frequency response in the low frequency range can be improved by varying the capacitance value of the input
capacitor. The recommended value is 2.2µF or less.
5. Impulse noise
This IC includes a function for preventing impulse noise from appearing in the output. The effect of this function can
be improved by using it in combination with the muting function.
•
When turning on the amplifier, turn the power supply and the mute function on at the same time.
Then turn the mute function off after the output current potential has stabilized.
•
When turning off the amplifier, first turn on the muting function and then turn off the power.
6. Electric mirror noise suppression measures
A capacitor about twice the size of the input capacitors must be used for the capacitor between pins 1 and 25 that is
used to minimize noise from the electrically driven mirror.
In the sample application circuit, a 0.47µF capacitor is used for 0.22µF input capacitors.
Note that the capacitor connected between pins 1 and 25 must be connected to the same pre-ground as the input
capacitors.
No.8307-4/7
LA47516
350
ICCO -- VCC
Output midpoint voltage, VN – V
Without a heat sink
RL = Open
Rg = 0Ω
4
VN -- VCC
RL = Open
Rg = 0Ω
Quiescent current, ICCO – mA
300
250
3
200
2
150
100
1
50
0
6
8
10
12
14
16
18
20
0
6
8
10
12
14
16
18
20
Supply voltage, VCC – V
70
PO -- VCC
Supply voltage, VCC – V
50
PO -- VCC
60
f = 1kHz
RL = 4Ω
Vi = 2.5Vrms
40
f = 1kHz
RL = 4Ω
THD = 10%
Output power, PO – W
50
Output power, PO – W
40
30
30
20
20
All channels are similar
All channels are similar
10
10
0
8
9
10
11
12
13
14
15
16
17
18
0
8
9
10
11
12
13
14
15
16
17
18
Supply voltage, VCC – V
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
0.1
2
3
5
7 1.0
2
3
5
7
2
3
5
THD -- PO
Supply voltage, VCC – V
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
0.1
2
3
5
THD -- PO
Total harmonic distortion, THD – %
CH1
CH2
CH3
CH4
Total harmonic distortion, THD – %
VCC = 14.4V
RL = 4Ω
f = 1kHz
VG = 32dB
VCC = 14.4V
RL = 4Ω
f = 100Hz
VG = 32dB
CH1
CH2
CH3
CH4
10
7 1.0
2
3
5
7
10
2
3
5
Output power, PO – W
10
7
THD -- PO
Output power, PO – W
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
100
THD -- f
Total harmonic distortion, THD – %
5
3
2
1.0
7
5
3
2
0.1
0.1
CH4
CH1
CH2
CH3
Total harmonic distortion, THD – %
VCC = 14.4V
RL = 4Ω
f = 10kHz
VG = 32dB
VCC = 14.4V
RL = 4Ω
PO = 4W
VG = 32dB
CH1 CH2
CH3
2
3
CH4
5 7 1k
2
3
5
7 10k
2
3
5
7 100k
2
3
5
7 1.0
2
3
5
7
10
2
3
5
Output power, PO – W
Frequency, f – Hz
No.8307-5/7
Microchip MCU
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