The LA4631VC built-in a 2 channel single-ended output power amplifier that a power supply voltage range is wide and
has additionally the standby function to reduce the current drain. It is a power amplifier IC suitable for driving speaker
of various audio system equipments, which is especially useful for products that use batteries.
Functions
•
Output power = 4.5W (typical)
•
Built in standby function (Pin5)
•
Built in thermal suht down circuit
(VCC = 12V, RL = 3Ω, THD+N = 10%)
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
IO peak
Pd max
Topr
Tstg
With no input signal
Per channel
With an infinitely large heat sink
Conditions
Ratings
24
2.5
25
-20 to +75
-40 to +150
Unit
V
A
W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Recommended load resistance range
Allowable
range
*: VCC, RL, and output level such that Pd max, is not exceeded for the size of heat sink used.
operating
supply
voltage
Symbol
VCC
RL op
VCC op
Conditions
Ratings
12
3 to 8
5.5 to 22
Unit
V
Ω
V
Semiconductor Components Industries, LLC, 2013
May, 2013
41812 SY 20120203-S00005 No.A2051-1/7
LA4631VC
Electrical Characteristics
at Ta = 25°C, VCC = 12V, RL = 3Ω, f = 1kHz, Rg = 600Ω
Parameter
Quiescent current
Standby current
Voltage gain
Total harmonic distortion
Output power
Symbol
ICCO
Ist
VG
THD
PO1
PO2
Output noise voltage
Ripple rejection
Channel separation
Input resistance
Standby pin applied voltage
VNO
SVRR
CHsep
Ri
Vst
Amplifier on(Pin 5 voltage)
VO = 0dBm
PO = 1W
THD = 10%
VCC = 9V, THD = 10%
Rg = 0Ω, BPF = 20Hz to 20kHz
Rg = 0Ω, fR = 100Hz, VCCR = 0dBm
Rg = 10kΩ, VO = 0dBm
50
55
20
1.5
3.0
2.0
33
Rg = 0Ω
Conditions
Ratings
Min.
18
Typ.
35
1
35
0.15
4.5
2.5
0.05
60
65
30
5.0
40
0.25
Max.
80
10
37
0.4
Unit
mA
µA
dB
%
W
W
mVrms
dB
dB
kΩ
V
Package Dimensions
Unit : mm (typ)
3049C
26.8
(20.0)
(R1.7)
HEAT SPREADER
4.0
(8.4)
(11.8)
1.0 MIN
1
0.5
12
1.0
7.0
6.0
13.2 MAX
0.4
2.0
(2.4)
2.0
SANYO : SIP12H
Pd max -- Ta
30
Allowable power dissipation, Pd max -- W
25
With an infinitely
large heat sink
20
15
12.5
10
7
5
3.2
100
×100 ×1.5mm
3
50× 50× 1.5mm
3
Single IC
0
-20
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta -- C
No.A2051-2/7
LA4631VC
Block Diagram
Application Circuit Example
LA4631VC
Ripple
Filter
1
IN1
2
PRE
GND
3
IN2
4
Standby
5
P.P
6
VCC
7
OUT2
8
NC
9
PWR
GND
10
NC
11
OUT1
12
+
+
+
+
+
+
RL
VSTB 5V
+
Top view
VCC
RL
No.A2051-3/7
LA4631VC
External Components and Usage Notes
C1, C2 : These are input coupling capacitors; we recommend a value of 1μF or lower. The LA4631VC input pin
potential is about 1.4V, and the polarity must be considered due to the DC potential of the circuits connected
to the LA4631VC 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
(Reference) Pin 5 Equivalent Circuit Inside IC
(Reference) Pin 5 IC internal equivalent circuit
Rx
+
Ix=max 4.5mA
Ix
5
Standby
applied
voltage Vx
STBY
R2
2k
•
The amplifier can be turned on and off by controlling the level (high/low) of Pin 5.
•
Applying a signal equal or greater than 1.5V and 800μA to Pin 5 turns on the amplifier. (If 5V is applied directly to
Pin 5 the inflow current od Pin 5 is approximately 4.5mA.)
•
If a voltage, Vx, exceeding 5V is to be applied, current limiting resistor (Rx) should be inserted to limit the inflow
current to 4.5mA. (See following equation.)
Rx = (Vx – 5V)/4.5mA
•
If Pin 5 is to be controlled by the microprocessor, the Pin 5 inflow current (Ix) should be optimized for the capacity
of the microprocessor by calculating Rx using the following equation, as a general guideline, and then confirming
the inflow current through sctual measurement.
Rx = (Vx/Ix) – R1 (2kΩ)
Note: When apply voltage to standby (Pin 5), please add resistor (Rx).
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