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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 2channel 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 x 2)/4278(10 W x 2). * Package: SIP-10HD (2.54 mm pitch, straight pins). * Thermal protection circuit and overvoltage protection circuit on chip. * Output power: 3 W x 2(VCC = 16 V/RL = 8 ).
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 = 25C
Parameter Maximum supply voltage Allowable power dissipation Thermal resistance Operating temperature Storage temperature Symbol VCC 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
j-c
Topr Tstg
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Load resistance Operating supply voltage range Symbol VCC RL VCC op Range does not exceed Pd Conditions Ratings 16 8 10 to 24 Unit V 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 = 25C, VCC = 16 V, RL = 8 , f = 1 kHz, RNF = 150 , Rg = 600 , with specified board, in specified circuit
Parameter Quiescent current Voltage gain Total harmonic distortion Output noise voltage Output power Ripple rejection Crosstalk Symbol ICCO VG THD VNO PO SVRR CT Rg = 0 VO = 0 dBm PO = 0.5 W Rg = 10 k, BPF = 20 Hz to 20 kHz THD = 10 % Rg = 0, fr = 100 Hz, Vr = 0.5 Vrms Rg = 10 k, VO = 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 x 100 x 1.5 mm3
AI heat sink Mounting torque 39N*cm Flat washer Silicone grease applied
7.02
50 x 50 x 1.5 mm3
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
20 k
20 k
NF1
C1 R1 100 F 150
IN1 2
Filter 3
R2 100 k C3 100 F
56
PRE GND 4 5
IN2
NF2
OUT2 Power GND 7 8
C7 0.1 F
VCC 9
C8 1000 F
OUT1 10
1
6
R4 100 k R5 150
C9 1000 F
C5 100 F
C6 1000 F
R3 200
+
+
+ +
C4 4.7 F
+
+
+
R6 1.0
C2 4.7 F
RL
RL
* For Muting, add a resistor between pin 3 and GND. 750 for the LA4266/67/68, 200 for the LA4276/77.
R7 1.0
C10 0.1 F
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 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 , 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
Rf 30 k
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 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
THD - f
VCC = 16 V RL = 8 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 23 5 7 100 23 5 71k 23 5 7 10 k 23 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 Rg = 10 k VO = 0
VCC = 16 V RL = 8 0 VO = 0
70
--1
Crosstalk, CT -- dB
Response -- dB
CH2CH1
60
CH1CH2
--2
50
--3
--4
40
--5 10
23
5 7 100
23
Frequency, f -- Hz
5 71k
23
5 7 10 k 2 3 5 7100 k ILA00864
30 10
23
5 7 100
23
Frequency, f -- Hz
5 71k
23
5 7 10 k 2 3 5 7100 k ILA00865
0.5
VNO - Rg
Output ripple voltage, Vro -- mVrms
VCC = 16 V RL = 8 DIN Audio
3 2 10 7 5 3 2 1.0 7 5 3 2 0.1
Vro - Vr
VCC = 16 V RL = 8 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 -- ILA00866
0.1
2
3
5
Ripple voltage, Vr -- V
7 1.0 ILA00867
No. 7094-5/6
LA4276
5
Pd - PO
VCC = 16 V RL = 8 f = 1 kHz Pd = VCC x CC - 2 x PO
Power dissipation, Pd - W
4
3
2
1
0 0.1
2
3
5
7
1.0
2
3
5
Output power, PO - W
ILA00868
0.5 s/DIV
0.5 s/DIV
Pop noise waveform (1 V/DIV)
0
Pop noise waveform (1 V/DIV) SP terminal AC Output DC
0
Middle point rise waveform (5 V/DIV) Middle point fall waveform (5 V/DIV)
0 0 ILA00957
Power on output waveform
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

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