Page 1
Ordering number: EN742G
Monolithic Linear IC
LA4182
2.3 W 2-Channel AF Power Amplifier
Features
.
Built-in 2 channels enabling use in stereo and bridge
amplifier applications.
.
High output: 2.3 W/channel, VCC=9V,RL=4Ω, and
4.7 W/bridge, R
.
Minimum number of external parts required : 9 pcs. min.
(Stereo/bridge).
.
Small pop noise at the time of power supply ON/OFF due to
built-in muting circuit.
.
Good ripple rejection ratio due to built-in ripple filter.
.
Soft tone at the time of output saturation.
.
Good channel separation.
.
Voltage gain fixed at 45 dB (Bridge: 51 dB). Variable
voltage gain available with external resistor added.
.
Easy to design radiator fin.
=8Ω.
L
Specifications
Package Dimensions
unit : mm
3022A-DIP12F
[LA4182]
SANYO : DIP12F
Note) In general applications, heat generated in this package
can be radiated through the Cu-foiled area of the printed
circuit board, but since power dissipation Pd may be
increased depending on the supply voltage and load
conditions, it is recommended to use a fin additionally.
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max
Operating temperature Topr −20 to +75 °C
Storage temperature Tstg −55 to +150 °C
CC
max
With signal 11 V
Quiescent 15 V
With printed circuit board
(Refer to Pd-Ta characteristics)
4W
Recommended Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Supply voltage V
Load resitance R
CC
L
Stereo 4 to 8 Ω
Bridge 8 Ω
9V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
41596HA(II)/O207KI/2146KI/4025KI/O291KI,TS No.742-1/9
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LA4182
Operating Characteristics at Ta = 25°C, VCC=9V,f=1kHz, RL=4Ω,Rg=600Ω, ( ): 8 Ω,
See specified Test Circuit.
Parameter Symbol Conditions min typ max Unit
Quiescent current I
CCO
Voltage gain VG
Voltage gain difference ∆VG Stereo ±1dB
Output power P
Total harmonic distortion THD
Input resistance r
Output noise voltage V
NO
Ripple rejection ratio R
Channel separation CHsep Rg = 10 kΩ,V
Cu plate (fin 1)
Fe plate
(fin 1)
Fe Plate
(fin 2)
Stereo Stereo 40 55 mA
Closed loop, V
= −45 dB Stereo 43 45 47 dB
IN
Closed loop, VIN = −45 dB Bridge 49 51 53 dB
THD = 10% Stereo 1.7
O
2.3
(1.3)
THD = 10% Bridge (4.7) W
= 250 mW Stereo 0.3 1.5 %
P
O
P
= 250 mW Bridge 0.5 %
O
i
21 30 kΩ
Rg = 0 Stereo 0.3 1.0 mV
Rg=10kΩ Stereo 0.5 2.0 mV
Rg=0,VR= 150 mV Stereo 40 46 dB
r
= 0 dB Stereo 40 55 dB
O
W
Recommended
printed circuit
board only
Cu-foiled area
reduced board
IC only
Allowable power dissipation, Pd max − W
Ambient temperature, Ta − °C
Pin Assignment and Equivalent Circuit
Shock
noise
rejecter
Input
amp 1
Input
amp 2
Ripple filter
Output
amp 1
Output
amp 2
Unit (resistance: Ω)
No.742 -2/9
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Sample Application Circuit 1 : Stereo
LA4182
(Mylar)
(Mylar)
Unit (capacitance: F)
Stereo
Bridge
Unit (capacitance: F)
Example of printed pattern (bottom view) for use in stereo, bridge amplifier applications : 60 × 80 mm
2
Sample Application Circuit 2 : Bridge
(Mylar)
(Mylar)
Unit (capacitance: F)
No.742 -3/5
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Description of External Parts
LA4182
C1(C2) Feedback capacitor The low cutofffrequency depends on this capacitor.If the capacity is increased,
C3(C4) Bootstrap capacitor If the capacity is decreased, the output at low frequencies goes lower.
C5(C6) Oscillation preventing capacitor Polyester film capacitor, being good in temperature characteristic, frequency
C7(C8) Output capacitor The low cutoff frequency depends on this capacitor. In order for the low
C9 Decoupling capacitor Used for the ripple filter. Since the rejection effect is saturated at a certain
C10 Power source capacitor
the starting time is delayed.
characteristic, is used. If an aluminum electrolytic capacitor or ceramic capacitor
is used, oscillation may occur at low temperatures.
frequency characteristic in the bridge amplifier to be equal to that in the stereo
amplifier application, the capacity must be doubled.
capacity, it is meaningless to increase the capacity more than needed. This
capacitor, being also used for the time constant of the muting circuit, affects the
starting time.
Application Circuit
1. Voltage gain adjustment
k Stereo
The voltage gain depends on built-in resistors R1 (R2),
R3 (R4) as follows :
VG = 20log
If the IC is used at a voltage gain less than this, the
following equation with Rf added applies.
VG = 20log
where R1 (R2) = 50 Ω,R3(R4)=10kΩ
R3 (R4)
R1 (R2)
[dB]
R3 (R4)
R1 (R2) + Rf
[dB]
k Bridge
The above shows the bridge amplifier configuration, where ch.1 operates as a noninverting amplifier and ch.2 as an inverting
amplifier. The output of ch.1 is divided with R5, R6 and led to pin 1 and then input to ch.2.
Since the attenuation degree (R5/R6) of ch. 1 output and the amplification degree (R4/R2 + R6) of ch. 2 are fixed at an equal
value, the ch.2 output is in opposite phase with the ch. 1 output. Therefore, the total voltage gain gets apparently 6 dB higher
than the voltage gain of ch.1 alone and is determined by the following equation.
R3
VG = 20log
R1
+ 6 [dB]
If the IC is used at a voltage gain less than this, the following equation with Rf added applies.
VG = 20log
R3
R1+Rf
+ 6 [dB]
No.742 -4/9
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LA4182
2. Proper cares in using IC
.
If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to
be exceeded, thereby leading to a breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the
range where the maximum rating is not exceeded.
.
Pin-to-pin short
If the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur. When
mounting the IC on the board of applying the supply voltage, make sure that the space between pins is not shorted with solder,
etc.
.
Load short
If the IC is used with the load shorted for a long time, a breakdown or deterioration may occur. Be sure not to short the load.
.
When the IC is used in radios or radio-cassette tape recorders, keep a good distance between IC and bar antenna.
.
When making the board, refer to the example of printed circuit pattern.
Proper cares in operating a set with LA4182 incorporated
When a set with the LA4182 incorporated is operated from AC power supply, a momentary drop in supply voltage is caused by
the transformer regulation, etc. at the time of turning ON the motor with the circuit shown below. In this case, if ripple noise is
generated from the speaker or headphone, take the following actions.
1. Connect a diode (rectifier diode of average rectified current I
the voltage at pin 6 can follow the supply voltage regulation. In the steady state, this diode is cut off.
2. Increase the capacity of the power source capacitor so that the supply voltage regulation can be minimized.
= 100 to 200 mA) across pins 6 and 12 of the LA4182 so that
O
Unit (capacitance: F)
Radiation design
.
Since the DIP 12-pin package is so designed as to be able to radiate heat through the Cu-foiled area of printed circuit board
under normal operating conditions, make the Cu-foilled area near the fin of IC as large as possible when designing the printed
circuit board.
.
By providing the Cu-foiled area covered by the broken line as shown in the above-mentioned example of printed circuit pattern,
a rather satisfactory radiation is enabled. (Refer to the Pd max-Ta characteristics.)
.
Since the power dissipation (Pd) goes higher depending on the conditions of supply voltage and load, it is recommended to use
a fin together with the printed circuit board.
.
The following equations are rule-of-thumb guides for Pd (for stereo). For AC power supply, it is desirable to measure with the
transformer of each individual set. In the bridge amplifier application, calculation should be made with 1/2 of the load used.
(1) DC power supply
V
Pd max =
CC
π2R
2
+I
v VCC(For stereo)
CCO
L
No.742 -5/9
Page 6
(2) AC power supply
CC
π2R
(Pd)
L
2
+I
v VCC(Pd) (For stereo)
CCO
Pd max =
V
CC
V
CC
V
2 : Quiescent supply voltage
(Pd) : Supply voltage at max. output,
VCC1 : Supply voltage at max. output
r : Voltage regulation,
V
CC
LA4182
2−VCC1
VCC1
I
CCO
: Quiescent current
Example of fin mounting
The fin is formed into such a shape as to be able to radiate heat from the plastic fin area of IC and the fin as shown below and is
soldered to the printed circuit board. For the fin size, refer to the Pd max-Ta characteristics. The desirable material is copper or
iron which is solderable. It is recommended to apply silicone grease, etc. to the plastic area of IC in order to minimize the thermal
resistance.
Printed circuit board
Example of fin-mounting
Fin
[Stereo Application]
−W
O
Output power, P
Input voltage, VIN−mV
Response − dB
Frequency,f−Hz
No.742 -6/9
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LA4182
Voltage gain, VG − dB
Total harmonic distortion, THD − %
Frequency,f−Hz
Total harmonic distortion, THD − %
Total harmonic distortion, THD − %
Output power, PO−W
Output power, PO−W
Frequency,f−Hz
Amp. 2 → 1
Amp. 1 → 2
Total harmonic distortion, THD − %
Frequency,f−Hz
VCC(Ripple) = 150 mVrms/f = 50 Hz
−mV
NO
Output noise voltage V
Output ripple voltage, Vrp − mV
Channel separation, CHsep − dB
Frequenccy,f−Hz
Using specified fin
Power dissipation, Pd (Stereo) − W
Signal source resistance, Rg − Ω
Output power, PO−W
No.742 -7/9
Page 8
Using specified fin
Power dissipation, Pd (Stereo) − W
Output power, PO−W
LA4182
−mA
CC
Current drain, I
Output power, PO-W
−W
O
Output power, P
(Midpoint voltage) − V
N
Supply voltage, VCC−V
− mA (Stereo)
CCO
Quiescent current, I
−mA
CCO
Quiescent current, I
−V
N
Midpoint voltage, V
Supply voltage, VCC−V
Output voltage, V
Ambient temperature, Ta − °C
[Bridge Application]
−W
O
Output power, P
Input voltage, VIN−mV
Ambient temperature, Ta − °C
Response − dB
Frequency,f−Hz
No.742 -8/9
Page 9
LA4182
Total harmonic distortion, THD − %
Total harmonic distortion, THD − %
−W
O
Output power, PO−W
Frequency,f−Hz
Total harmonic distortion, THD − %
Output power, PO−W
Using specified fin
Power dissipation, Pd − W
Output power, PO−W
−mA
CC
Output power, P
Supply voltage, VCC−V
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of April, 1996. Specifications and information herein are subject to change without notice.
Current drain, I
Output power, PO−W
No.742 -9/9
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