Ordering number: ENN7094
Monolithic Linear IC
LA4276
3 W 2-Channel Power Amplifier
Overview
The LA4276 is a 3 W 2-channel power amplifier intended
for televisions.
This IC has a series of pin compatible monaural and 2-
channel power amplifiers, thus allows the end product to
use a common circuit boad.
Package Dimensions
unit: mm
3248-SIP10HD
[LA4276]
Features
• Television audio output.
• Pin compatible with the LA4266 (3 W)/LA4267 (5 W)/
4268 (10 W) and the LA4277 (5 W
×
2)/4278(10 W
×
2).
• Package: SIP-10HD (2.54 mm pitch, straight pins).
• Thermal protection circuit and overvoltage protection
circuit on chip.
• Output power: 3 W
×
2(V
CC
= 16 V/R
L
= 8
Ω).
25.6
C0.7
3.4
(10.0)
2.0
2.4
1.0 min
1
1.37
2.54
0.5
1.15
10
4.5
13.9
11.2
(11.8)
15.4max
0.4
1.2
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Thermal resistance
Operating temperature
Storage temperature
Symbol
V
CC
Pd max
Rg = 0
Infinite heat sink
Conditions
SANYO: SIP10HD
Ratings
25
15.0
3.0
–20 to +75
–40 to +150
Unit
V
W
°C/W
°C
°C
θ
j-c
Topr
Tstg
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Load resistance
Operating supply voltage range
Symbol
V
CC
R
L
V
CC
op
Range does not exceed Pd
Conditions
Ratings
16
8
10 to 24
Unit
V
Ω
V
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
41202RM (II) No. 7094-1/6
LA4276
Operating Characteristics
at Ta = 25°C, V
CC
= 16 V, R
L
= 8
Ω,
f = 1 kHz, RNF = 150
Ω,
Rg = 600
Ω,
with specified
board, in specified circuit
Parameter
Quiescent current
Voltage gain
Total harmonic distortion
Output noise voltage
Output power
Ripple rejection
Crosstalk
Symbol
I
CCO
VG
THD
V
NO
P
O
SVRR
CT
Rg = 0
V
O
= 0 dBm
P
O
= 0.5 W
Rg = 10 kΩ, BPF = 20 Hz to 20 kHz
THD = 10 %
Rg = 0, f
r
= 100 Hz, Vr = 0.5 Vrms
Rg = 10 kΩ, V
O
= 0 dBm
2.5
35
40
38
Conditions
min
Ratings
typ
46
40
0.1
0.25
3.0
45
45
max
62
42
0.8
1.0
Unit
mA
dB
%
mV
W
dB
dB
16
Pd max – Ta
15
15
Allowable power dissipation, Pd max – W
14
12 11.7
10
8
6 5.8
4
2
2
Infinite heat sink
100
×
100
×
1.5 mm
3
AI heat sink
Mounting
torque 39N•cm
Flat washer
Silicone grease
applied
7.02
50
×
50
×
1.5 mm
3
3.48
No heat sink
1.2
0
20
40
60
80
100
120
140
160
0
--20
Ambient temperature, Ta –
°C
ILA00835
Pin Assignment and Equivalent Circuit Diagram
56
Ω
20 kΩ
20 kΩ
NF1
C1
R1
100
µF
150
Ω
IN1
2
Filter
3
R2
100 kΩ
C3
100
µF
56
Ω
PRE GND
4
5
IN2
NF2
OUT2 Power GND
7
8
C7
0.1
µF
VCC
9
C8
1000
µF
OUT1
10
1
6
R4
100 kΩ
R5
150
Ω
C9
1000
µF
C5
100
µF
C6
1000
µF
R3
200
Ω
+
+
+
+
C4
4.7
µF
+
+
+
R6
1.0
Ω
C2
4.7
µF
RL
RL
* For Muting, add a resistor between pin 3 and GND. 750
Ω
for the LA4266/67/68, 200
Ω
for the LA4276/77.
R7
1.0
Ω
C10
0.1
µF
No. 7094-2/6
LA4276
Description of External Parts
C1, C5: Feedback capacitors
Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the
starting time later.
C2, C4: Input capacitors
C3: Ripple filter capacitor
Decreasing the capacitance value too far or eliminating it altogether causes ripple to occur. However, ripple is not
necessarily reduced if the capacitance value is increased. This capacitor also affects the starting time; decreasing the
capacitance value makes the starting time earlier.
C6, C9: Output capacitors
Decreasing the capacitance value causes insufficient power at low frequencies.
C7, C10: Oscillation blocking capacitors
Decreasing the capacitance value causes oscillation to occur easily. Use a mylar film capacitor that has good high
frequency response and temperature characteristics. The use of an electrolytic capacitor or a ceramic capacitor may
cause oscillation to occur at low temperatures.
C8: Power capacitor
Decreasing the capacitance value causes ripple to occur easily. Locating this capacitor at a distance from the IC or
removing this capacitor may cause oscillation to occur.
R1, R5: Feedback resistors
Refer to supplementary discussion “Voltage Gain.”
R2, R4: Input bias resistors
These determine the bias (GND potential bias) and the input impedance of the input pins. If a variable resistor or
other device also serves this function, these resistors can be omitted.
R3: Muting resistor
Refer to supplementary discussion “External Muting.”
R6, R7: Resistors connected in series with oscillation blocking capacitor
These prevent phase shift in conjunction with the oscillation blocking capacitor so that oscillation does not easily
occur. There is an optimal value for the resistor; increasing or decreasing the resistance causes oscillation to occur
easily.
External Muting
• Pull down the electric potential of the ripple filter pin (pin 3).
Muting becomes possible by inserting the discharge resistor R3 between pin 3
and GND. If the resistance value of R3 is too low, a popping noise is generated; if
the resistance value is too high, the muting effect is reduced. (A value of 200
Ω
is
recommended for R3.)
IN1
2
Filter
3
PRE GND
4
C3
+
R3
Mute SW
Voltage Gain
The voltage gain can be lowered by adding external resistors R1/R5 in
series to feedback capacitors C1/C5. When R1/R5 = 150
Ω,
the voltage
gain is 40 dB. However, it is important to note that because there is no
phase compensation pin, decreasing the voltage gain can extend the high
frequency characteristics, allowing oscillation to occur easily.
RNF
300
Ω
Rf 30 kΩ
IN1/2
5
(2)
R1/R5
NF1/2
6
(1)
+
+
C6/C9
RL
OUT1/2
7
(10)
C1/C5
C7/C10
R2/R3
+
C2/C4
No. 7094-3/6
LA4276
Notes on Using the IC
• Maximum ratings
When this IC is used near its maximum ratings, it is possible that a slight fluctuation in the operating conditions could
cause the maximum ratings to be exceeded, damaging the IC. Therefore, allow for an adequate safety margin in
regards to supply voltage, etc., so that the IC is never used under conditions that exceed its maximum ratings.
• Short circuit between pins
Applying power to the IC while a short circuit exists between two pins can cause damage or deterioration in the IC.
Therefore, after mounting the IC on a board, make sure that there are no solder bridges, etc., causing a short circuit
between any of the pins before applying power to the IC.
• Using the IC in a radio
When using this IC in a radio, make sure that there is enough distance between the IC and the bar antenna.
• Printed circuit pattern
When designing the printed circuit pattern, keep power, output, and ground lines thick and short, and determine the
placement of the pattern and the components in such a way as to prevent the generation of an I/O feedback loop.
In addition, power supply capacitor C8 and oscillation blocking capacitor C7 and C10 should be placed as close as
possible to the IC pins in order to prevent oscillation.
No. 7094-4/6
LA4276
ICCO – VCC
Rg = 0
45
50
10
PO
–
VCC
RL = 8
Ω
f = 1 kHz
Quiescent current, ICCO — mA
35
30
25
20
15
10
5
0
0
5
10
15
20
25
Output power, PO — W
30
35
ILA00860
40
8
6
4
2
0
6
8
10
12
14
16
18
20
22
Supply voltage, VCC — V
3
2
Supply voltage, VCC — V
2
24
26
ILA00861
THD – PO
Total harmonic distortion, THD — %
VCC = 16 V
RL = 8
Ω
THD – f
VCC = 16 V
RL = 8
Ω
PO = 0.5 W
Total harmonic distortion, THD -- %
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
0.1
1.0
7
5
3
2
f = 10 kHz
0.1
7
5
3
2
10
2 3
5 7 100
2 3
5 71k
2 3
5 7 10 k
2 3 5
ILA00863
f = 1 kHz
f = 100 Hz
2
3
5
7
1.0
2
3
5
Output power, PO — W
1
ILA00862
80
Frequency, f — Hz
Response – f
CT – f
VCC = 16 V
RL = 8
Ω
Rg = 10 kΩ
VO = 0
VCC = 16 V
RL = 8
Ω
0
VO = 0
70
Crosstalk, CT — dB
Response — dB
--1
CH2
→C
H1
60
CH1→CH2
--2
50
--3
--4
40
--5
10
2 3
5 7 100
2 3
Frequency, f —
5 71k
2 3
5 7 10 k 2 3 5 7100 k
Hz
ILA00864
30
10
2 3
5 7 100
2 3
Frequency, f — Hz
5 71k
2 3
5 7 10 k 2 3 5 7100 k
ILA00865
0.5
VNO – Rg
Output ripple voltage, Vro — mVrms
VCC = 16 V
RL = 8
Ω
DIN Audio
3
2
10
7
5
3
2
1.0
7
5
3
2
0.1
Vro – Vr
VCC = 16 V
RL = 8
Ω
fr = 100 Hz
Output noise voltage, VNO — mVrms
0.4
0.3
0.2
0.1
0
1k
2
3
5
7
10 k
2
3
5
7 100 k
3
5
7
Input signal source resistance, Rg —
Ω
ILA00866
0.1
2
3
5
Ripple voltage, Vr — V
7
1.0
ILA00867
No. 7094-5/6
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