SANYO LA4276

Ordering number: ENN7094
Monolithic Linear IC
LA4276
3 W 2-Channel Power Amplifier
Overview
Package Dimensions
The LA4276 is a 3 W 2-channel power amplifier intended
for televisions.
This IC has a series of pin compatible monaural and 2channel power amplifiers, thus allows the end product to
use a common circuit boad.
unit: mm
3248-SIP10HD
[LA4276]
Features
2.4
25.6
C0.7
2.0
(10.0)
1
1.37
2.54
10
0.5
4.5
13.9
11.2
(11.8)
15.4max
3.4
1.0 min
• 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(VCC = 16 V/RL = 8 Ω).
1.15
0.4
1.2
Specifications
SANYO: SIP10HD
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Allowable power dissipation
VCC
Pd max
Conditions
Ratings
Rg = 0
Infinite heat sink
Unit
25
V
15.0
W
°C/W
Thermal resistance
θ j-c
3.0
Operating temperature
Topr
–20 to +75
°C
Storage temperature
Tstg
–40 to +150
°C
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
16
V
RL
8
Ω
10 to 24
V
Load resistance
Operating supply voltage range
VCC op
Conditions
Ratings
Range does not exceed Pd
Unit
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, VCC = 16 V, RL = 8 Ω, f = 1 kHz, RNF = 150 Ω, Rg = 600 Ω, with specified
board, in specified circuit
Parameter
Symbol
Conditions
min
Quiescent current
ICCO
Rg = 0
Voltage gain
VG
VO = 0 dBm
Total harmonic distortion
THD
PO = 0.5 W
Output noise voltage
VNO
Rg = 10 kΩ, BPF = 20 Hz to 20 kHz
Output power
PO
Ripple rejection
SVRR
Crosstalk
CT
Unit
max
46
62
mA
40
42
dB
0.1
0.8
%
0.25
1.0
mV
38
THD = 10 %
2.5
3.0
W
Rg = 0, fr = 100 Hz, Vr = 0.5 Vrms
35
45
dB
Rg = 10 kΩ, VO = 0 dBm
40
45
dB
Pd max – Ta
16
Allowable power dissipation, Pd max – W
Ratings
typ
AI heat sink
Mounting
torque 39N•cm
Flat washer
Silicone grease
applied
15
15
14
Infinite heat sink
12 11.7
100 × 100 × 1.5 mm3
10
8
7.02
50 × 50 × 1.5 mm3
6 5.8
4
2
3.48
No heat sink
2
0
--20
1.2
0
20
40
60
80
100
120
Ambient temperature, Ta – °C
140
160
ILA00835
Pin Assignment and Equivalent Circuit Diagram
56 Ω
20 kΩ
+
+
C10
0.1 µF
10
RL
R7
1.0 Ω
C7
0.1 µF
RL
R6
1.0 Ω
9
+
C6
1000 µF
OUT1
VCC
C9
1000 µF
8
R5
150 Ω
+
+
OUT2 Power GND
7
C8
1000 µF
NF2
6
R4
100 kΩ
+
IN2
5
C5
100 µF
PRE GND
4
C3
100 µF
R2
100 kΩ
3
C4
4.7 µF
Filter
R3
200 Ω
IN1
2
C2
4.7 µF
+
C1
R1
100 µF 150 Ω
NF1
1
56 Ω
20 kΩ
* For Muting, add a resistor between pin 3 and GND. 750 Ω for the LA4266/67/68, 200 Ω for the LA4276/77.
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.)
Filter
IN1
2
PRE GND
3
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
NF1/2
IN1/2
5
OUT1/2
6
7
(2)
(1)
(10)
R1/R5
+
C1/C5
+
+
C6/C9
RL
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
50
PO – VCC
10
RL = 8 Ω
f = 1 kHz
Rg = 0
40
Output power, PO — W
Quiescent current, ICCO — mA
45
35
30
25
20
15
10
8
6
4
2
5
0
0
10
5
0
15
20
25
30
35
ILA00860
Supply voltage, VCC — V
THD – PO
10
7
5
3
2
f = 10 kHz
3
2
f = 1 kHz
0.1
7
5
3
0.1
f = 100 Hz
2
3
5
7
2
1.0
3
Output power, PO — W
Crosstalk, CT — dB
Response — dB
--3
18
20
22
24
26
ILA00861
7
5
3
2
0.1
7
5
3
2 3
5 7 100
2 3
5 71k
2 3
5 7 10 k
2 3 5
ILA00863
CT – f
VCC = 16 V
RL = 8 Ω
Rg = 10 kΩ
VO = 0
70
--2
16
Frequency, f — Hz
CH2→CH1
60
CH1→CH2
50
40
--4
2 3
5 7 100
2 3
5 71k
2 3
30
10
5 7 10 k 2 3 5 7100 k
ILA00864
Frequency, f — Hz
VNO – Rg
2 3
5 7 100
2 3
0.4
0.3
0.2
0.1
5 71k
2 3
5 7 10 k 2 3 5 7100 k
ILA00865
Frequency, f — Hz
Vro – Vr
3
VCC = 16 V
RL = 8 Ω
DIN Audio
Output ripple voltage, Vro — mVrms
0.5
Output noise voltage, VNO — mVrms
1.0
80
--1
0
1k
14
THD – f
ILA00862
VCC = 16 V
RL = 8 Ω
0 VO = 0
--5
10
12
VCC = 16 V
RL = 8 Ω
PO = 0.5 W
2
10
5
Response – f
1
10
2
VCC = 16 V
RL = 8 Ω
1.0
7
5
8
Supply voltage, VCC — V
Total harmonic distortion, THD — %
Total harmonic distortion, THD -- %
3
2
6
VCC = 16 V
RL = 8 Ω
fr = 100 Hz
2
10
7
5
3
2
1.0
7
5
3
2
0.1
2
3
5
7
10 k
2
3
5
7 100 k
Input signal source resistance, Rg — Ω ILA00866
3
5
7
0.1
2
3
Ripple voltage, Vr — V
5
7
1.0
ILA00867
No. 7094-5/6
LA4276
Pd – PO
Power dissipation, Pd – W
5
VCC = 16 V
RL = 8 Ω
f = 1 kHz
Pd = VCC × CC – 2 × PO
4
3
2
1
0
0.1
2
3
5
7
1.0
Output power, PO – W
2
3
5
ILA00868
0.5 s/DIV
0.5 s/DIV
Pop noise waveform (1 V/DIV)
Pop noise waveform (1 V/DIV)
SP terminal AC
0
0
Output DC
Middle point rise waveform (5 V/DIV)
Middle point fall waveform (5 V/DIV)
0
Power on output waveform
0
ILA00957
Power off output waveform
ILA00958
Specifications of any and all SANYO 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.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
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, 2002. Specifications and information herein are subject to
change without notice.
PS No. 7094-6/6