Ordering number : EN8177B
Monolithic Linear IC
LA4631
Overview
For Audio Applications
5W 2-Channel AF Power Amplifier
The LA4631 (5W×2 channels) is a single-ended power amplifier that has a pin arrangement similar to the LA4632 BTL
power amplifier (10W×2 channels). The LA4631's pin compatibility makes it possible to share a common printed circuit
board among a series of end products differentiated by power rank. (Note that the LA4632 is provided in an SIP-12H
package, and that it is necessary to provide a hole for the LA4631 pin 13 if the same printed circuit board is to be shared.
Note also that certain external components differ.)
Functions
•
2-channel power amplifier for audio applications
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Maximum junction temperature
Operating temperature
Storage temperature
Symbol
VCC max
IO peak
Pd max
Tj max
Topr
Tstg
With no input signal
Per channel
With an infinitely large heat sink
Conditions
Ratings
24
2
15
150
-20 to +75
-40 to +150
Unit
V
A
W
°C
°C
°C
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Recommended load resistance range
Allowable operating supply voltage range
Symbol
VCC
RL op
VCC op
Conditions
Ratings
14
4
5.5 to 22
Unit
V
Ω
V
*: VCC, RL, and the output level must be set for the size of the heat sink used so that the Pd max range is not exceeded.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
s products or
equipment.
60309 MS/N0508 MS JK/32405TN (OT) No.8177-1/6
LA4631
Electrical Characteristics
at Ta = 25°C, VCC = 14V, RL = 4Ω, f = 1kHz, Rg = 600Ω
Ratings
Parameter
Standby current
Quiescent current drain
Standby pin applied voltage
Output power
Total harmonic distortion
Voltage gain
Output noise voltage (rms)
Supply voltage rejection ratio
Channel separation
Input resistance
Ist
ICCO
Vst
PO
THD
VG
VNO
SVRR
CHsep
Ri
Symbol
VSTB = 0V
Rg = 0, VSTB = 5V
The pin 5 voltage such that the amplifier is on
THD = 10%
VO = 1W
VO = 0dBm
Rg = 0, BPF = 20Hz to 20kHz
Rg = 0, fR = 100Hz, VCCR = 0dBm
Rg = 10kΩ, VO = 0dBm
50
45
20
33
18
1.5
4
5
0.15
35
0.05
60
55
30
40
0.4
37
0.25
Conditions
min
typ
1
35
max
10
80
5
Unit
µA
mA
V
W
%
dB
mVrms
dB
dB
kΩ
Package Dimensions
unit : mm (typ)
3107B
16
Pd max -- Ta
Allowable power dissipation, Pd max -- W
15
14
12 11.7
10
8
6 5.8
4
2
2.0
With an infinitely
large heat sink
100×100×1.5mm
3
Aluminum heat
sink Tightening
torque : 39N
•
cm
With silicone
grease applied
θjc
= 3°C/W
50×50×1.5mm
3
Without a heat sink
0
-20
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta --
°C
No.8177-2/6
LA4631
Block Diagram
Application Circuit Example
LA4631
Ripple
Filter
1
C3 100µF 16V
C1 1µF 10V
IN1
2
PRE
GND
3
C2 1µF 10V
IN2
4
Standby
5
C4 4.7µF 16V
P.P
6
VCC
7
OUT2
8
C7 1000µF 16V
NC
9
PWR
GND
10
NC
11
OUT1
12
C6 1000µF 16V
NC
13
+
+
+
+
+
+
RL 4Ω
VSTB 5V
C5 1000µF 25V
+
Top view
VCC
RL 4Ω
No.8177-3/6
LA4631
External Components and Usage Notes
C1, C2 : These are input coupling capacitors; we recommend a value of 1µF or lower. The LA4631 input pin
potential is about 1.4V, and the polarity must be considered due to the DC potential of the circuits connected
to the LA4631 front end. The amplifier's startup time (the time from the point power is first applied until the
point an output is generated) will change proportionally with the values of these input capacitors. (When 1µF
capacitors are used, the startup time will be about 0.2 seconds.)
C3
: This capacitor is used as a ripple filter. We recommend a value of 100µF. Amplifier impulse noise when
turned off (when the standby pin goes low) may be made worse if a value under 100µF is used. The pin 1
voltage is about 1/2VCC. A DC mute function can be applied if pin 1 is connected to ground through a 300 to
500Ω resistor. Note that the muting activation voltage will be too low if a resistor value of 750Ω or higher is
used.
C4
: This is an impulse noise prevention capacitor. The recommended value is 4.7µF. If a value of 2.2µF or lower
is used for C4, impulse noise when the amplifier is turned off (when the standby pin goes low) may be made
worse. Also, if a value of 10µF or higher is used, an "incomplete muting" phenomenon may occur when the
amplifier is turned off (when the standby pin goes low).
C5
: Power supply capacitor. This capacitor should be located as close as possible to the IC (to minimize
increases in the power supply line impedance) to achieve stable amplifier operation.
C6, C7 : Output capacitors. These capacitors influence the amplifiers low band frequency characteristics. (fc =
1/2πCout×RL)
fc = low band cutoff frequency, Cout = C6, C7
•
Caution
Although the LA4631 is basically pin compatible with the LA4632, there are certain differences in the external
components and the way the devices are used.
(Reference) Pin 5 IC internal equivalent circuit
Rx
+
Ix=max 4.5mA
Ix
5
Standby
applied
voltage Vx
STBY
R2
2kΩ
•
The amplifier can be turned on or off by controlling the high/low state of pin 5.
•
The amplifier is turned on by applying a voltage of 1.5V or higher or an influx current of 800µA or higher. (If a 5V
level is applied directly to pin 5, the pin 5 influx current will be about 4.5mA.)
•
If a voltage, Vx, that exceeds 5V will be applied, insert a current limiter resistor (Rx) so that the influx current does
not exceed 4.5mA. (See the formula below.)
Rx = (Vx – 5V)/4.5mA
•
When pin 5 is controlled by a microcontroller, to set up a pin 5 influx current (Ix) optimal for the drive capacity of
the microcontroller, calculate Rx from the following formula as a first approximation and measure the influx current
to verify that level.
Rx = (Vx/Ix) – R1 (2kΩ)
*: When a voltage is applied to the standby pin (pin 5), refer to the above and insert a resistor (Rx) to limit the influx
current if required.
R1
2kΩ
No.8177-4/6
LA4631
70
ICCO -- VCC
RL = 4Ω
Rg = 0
10
9
8
PO -- VCC
Rg = 600Ω
fin = 1kHz
THD = 10%
60
Quiescent current, ICCO -- mA
50
Output power, PO -- W
7
6
5
4
3
2
R
L=
4
Ω
40
=
RL
8
Ω
30
20
10
1
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0
4
6
8
10
12
14
16
18
20
22
Supply voltage, VCC -- V
3
2
Supply voltage, VCC -- V
THD -- PO
THD -- f
Total harmonic distortion, THD -- %
Total harmonic distortion, THD -- %
10
7
5
3
2
1.0
7
5
3
2
VCC = 14V
RL = 4Ω
Rg = 600Ω
Filter : FLAT
10
7
5
3
2
VCC = 14V
RL = 4Ω
Rg = 600Ω
PO = 1W
Filter : FLAT
1.0
7
5
3
2
f = 10kHz
f = 1kHz
f = 100Hz
2
3
5
7
1.0
2
3
5
7
10
0.1
0.1
0.1
10
2 3
5 7 100 2 3
5 7 1k
2 3
5 7 10k
2 3
5 7 100k
Output power, PO -- W
1
0
-1
-2
-3
-4
-5
-6
1
-7
-8
10
0
10
Frequency, f -- Hz
6
Response -- f
PO -- f
VCC = 14V
RL = 4Ω
Rg = 600Ω
THD = 10%
THD = 1%
Output power, PO -- W
VCC = 14V
RL = 4Ω
Rg = 600Ω
VO = 0dBm
5
Response -- dB
4
3
2
2 3 5 7 100 2 3
5 7 1k
2 3 5 7 10k 2 3 5 7 100k 2
2 3
5 7 100 2 3
5 7 1k
2 3
5 7 10k
2 3
5 7 100k
Frequency, f -- Hz
-30
Frequency, f -- Hz
VCC = 14V
RL = 4Ω
Rg = 10kΩ
DIN AUDIO
0.3
CHsep -- f
Output noise voltage, VNO -- mVrms
VNO -- Rg
VCC = 14V
RL = 4Ω
DIN AUDIO
Channel separation, CHsep -- dB
-40
0.2
-50
CH2 1
CH1 2
-60
0.1
-70
10
2 3
5 7 100
2 3
5 7 1k
2 3
5 7 10k
2 3
5
0
100
2
3
Frequency, f -- Hz
Signal source resistance, Rg --
Ω
5 7 1k
2
3
5 7 10k
2
3
5 7 100k
No.8177-5/6
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