Ordering number : ENN7901
SANYO Semiconductors
DATA SHEET
Monolithic Linear IC
LA47536
Overview
Four-Channel 45 W BTL Car Audio
Power Amplifier
The LA47536 is a 4-channel BTL power amplifier IC developed for use in car audio systems. The output stage features
a pure complimentary structure that uses V-pnp transistors on the high side and npn transistors on the low side to
provide high power and superb audio quality.
The LA47536 includes almost all the functions required for car audio use, including a standby switch, a muting
function, and each protection circuit. It also provides a self-diagnosis function (output offset detection).
Functions and Features
• Voltage gain: 32 dB
• High output power
— Pomax(1) = 45 W (typical)
(At V
CC
= 14.4 V, f = 1 kHz, Vi = 2.5 Vrms, RL = 4
Ω)
— Pomax(2) = 40 W (typical)
(At V
CC
= 13.7 V, f = 1 kHz, Vi = 2.5 Vrms, RL = 4
Ω)
— Po = 28 W (typical)
(At V
CC
= 14.4 V, f = 1 kHz, THD = 10%, RL = 4
Ω)
• Muting function (pin 22)
• Standby switch (pin 4)
• Built-in various protection circuits
— Output pin-to-V
CC
short
— Output pin-to-GND short
— Load short
— Over voltage
— Thermal shut down
• Self-diagnosis function that detects the output offset (pin 25)
• Output offset detection on/off switch (pin 1)
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40804TN (OT) No.7901-1/7
LA47536
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Junction to case thermal resistance
Symbol
V
CC
max1
V
CC
max2
I
O
peak
Pd max
Topr
Tstg
Conditions
No signal, t = 1 minute
With an input signal applied
Per channel
Assuming an infinite heat sink
Ratings
26
18
4.5/ch
50
–40 to +85
–40 to +150
1
Unit
V
V
A
W
°C
°C
°C/W
θ
j-c
Recommended Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Recommended load resistance
Operating supply voltage range
Symbol
V
CC
R
L
op
V
CC
op
The range where Pd max is not exceeded
Conditions
Ratings
14.4
4
9 to 18
Unit
V
Ω
V
Electrical Characteristics
at Ta = 25°C, V
CC
= 14.4 V, RL = 4
Ω,
f = 1 kHz, Rg = 600
Ω
Parameter
Quiescent current
Standby current
Output offset
Voltage gain
Voltage gain difference
Output power
Total harmonic distortion
Channel separation
Ripple rejection ratio
Output noise voltage
Muting attenuation
Output center point potential
Symbol
I
CCO
Ist
V
N
offset
VG
∆VG
P
O 1
P
O
max1
P
O
max2
THD
CHsep
SVRR
V
NO
Ma
VN
THD = 10%
V
CC
= 13.7 V, V
IN
= 2.5 Vrms
V
IN
= 2.5 Vrms
P
O
= 4 W
V
O
= 0 dBm, Rg = 10 kΩ
Rg = 0, fr = 100 Hz, Vccr = 0 dBm, 20 Hz to 20 kHz
Rg = 0, 20 Hz to 20 kHz
V
O
= 20 dBm
Rg = 0
70
50
40
R
L
=
∞,
Rg = 0
Vst = 0
Rg = 0
V
O
= 0 dBm
–150
31
–1
23
28
40
45
0.1
60
45
300
90
2.65
450
0.4
32
Conditions
Ratings
min
typ
200
max
400
10
+150
33
+1
Unit
mA
µA
mV
dB
dB
W
W
W
%
dB
dB
µVrms
dB
V
Package Dimensions
unit : mm
3236
60
Pd max —Ta
INFINTE HEAT SINK
θj-c=1°C/W
Allowable power dissipation, Pd max — W
50
40
30
HEAT SINK(θf=3.5°C/W)
θj-c+θf=4.5°C/W
20
10
NO HEAT SINK
θj-a=39°C/W
0
–40
–20
0
20
40
60
80
100
120
140
160
SANYO : HZIP25
Ambient temperature, Ta —
°C
ILA06775
No.7901-2/7
LA47536
Functional Description
1. Standby Switch Function (pin 4)
The pin 4 threshold voltage is set to be 2 VBE. When Vst is 2.0V or higher, the amplifier will be on, and when Vst is
0.7V or lower, the amplifier will be off. Note that pin 4 requires an operating current of at least 40µA.
2. Muting Function
The IC is set to the muted state by setting pin 22 to the ground potential. In this state, the audio output is muted. The
time constant with which the muting function operates is set by an external RC circuit, and this time constant
influences the pop noise that occurs when the amplifier is turned on or off.
The muting on and off times due to the recommended external component values (R=10kΩ, C=3.3µF) are as follows.
Muting on time: 50ms
Muting off time: 20ms
3. Self-Diagnosis Function (Speaker burnout prevention)
During steady state operation, the LA47536 detects, internally, whether or not an abnormal amplifier output offset
has occurred, and outputs this signal from pin 25. Applications can prevent speaker burnout and other problems by
having the system microcontroller detect this pin 25 output signal and control either the standby state or the power
supply. (An abnormal output offset may be caused by, for example, input capacitor leakage current.)
The pin 25 signal is turned off by setting pin 1 to the ground potential.
4. Oscillator Stability
In some cases, parasitic oscillations may be induced by the PCB layout. This oscillation can be eliminated by adding
the components listed below. Note that the optimal capacitor value must be verified by testing in the actual mounted
state in the end product.
• Connect a capacitor and resistor (0.1µF and 2.2Ω) in series between each output pin and ground.
5. Audio Quality (Low band)
The frequency characteristics in the low frequencies can be improved by making the capacitance of the input
capacitors variable.
The recommended capacitance is 2.2µF and smaller.
6. Protection Circuits
Do not ground the outputs with the STBY voltage at around 1.4V. Also, do not turn the IC off in the grounded state
with a time constant provided for the STBY voltage.
7. Pop Noise
Although the LA47536 includes an pop noise prevention circuit, pop noise can be reduced even further by using the
muting function as well.
• Activate the muting function at the same time as power is applied. Then, after the output DC potential has
stabilized, turn off the muting function.
• When turning the amplifier off, first turn on the muting function and then turn off the power supply.
These two methods are effective at minimizing pop noise.
No.7901-3/7
LA47536
Block and Application Diagram
2200µF
Vcc1/2
Vcc3/4
+
0.022µF
6
20
IN1
+
0.22µF
11
Offset
Detect
Circuit
+
+
OUT1+
9
7
OUT1–
–
+5V
10kΩ
–
25
OFFSET DET
Protective
circuit
PWR GND1
8
+
OUT2+
–
IN2
5
+
0.22µF
12
+
OUT2–
–
3
PWR GND2
Aux
ST BY
2
Stand by
4
+5V
ST ON
circuit
Switch
Ripple
Mute
Mute
10kΩ
R.F
47µF
+
10
Filter
circuit
22
3.3µF
+
IN3
+
0.22µF
15
+
+
17
19
OUT3+
Low Level
Mute ON
OFFSET DET
OFF S.W
–
OUT3–
–
1
GND
OFFSET DET
OFF
PWR GND3
Protective
circuit
18
+
OUT4+
PRE GND
13
–
21
IN4
+
0.22µF
14
+
–
23
OUT4–
ON TIME C
22µF
+
16
Muting &
ON Time Control
Circuit
PWR GND4
24
*
Package:
HZIP25
No.7901-4/7
LA47536
350
ICCO — VCC
RL=Open
Rg=0Ω
Output midpoint voltage, VN — V
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
50
ILA06758
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
0.1
2
3
PO — VCC
Supply voltage, VCC — V
ILA06759
THD — PO
40
30
20
10
0
8
9
10
11
12
13
14
15
16
17
18
Total harmonic distortion, THD — %
f=1kHz
RL=4Ω
THD=10%
VCC=14.4V
RL=4Ω
f=1kHz
Output power, PO — W
5 7 1.0
2
3
5 7
10
2
3
5
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
ILA06760
10
7
THD — PO
Total harmonic distortion, THD — %
VCC=14.4V
RL=4Ω
f=100Hz
Output power, PO — W
ILA06761
THD — PO
Total harmonic distortion, THD — %
5
3
2
VCC=14.4V
RL=4Ω
f=10kHz
1.0
7
5
3
2
10
3
5
0.1
7
0.1
2
3
5 7 1.0
2
3
5 7
10
2
3
5
Output power, PO — W
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
100
2
3
5 7 1k
2
3
5 7 10k
2
3
ILA06762
4
THD — f
Output power, PO — W
ILA06763
Response — f
Total harmonic distortion, THD — %
VCC=14.4V
RL=4Ω
PO=4W
Response — dB
2
VCC=14.4V
RL=4Ω
VO=0dBm
Cin=0.22µF
0
–2
–4
–6
Frequency, f — Hz
5 7 100k
ILA06764
–8
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
Frequency, f — Hz
5 7100k
ILA06765
No.7901-5/7
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