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Ordering number:ENN1463C
Monolithic Linear IC
LA4265
3.5W Monaural Power Amplifier
Features
* Minimum number of external parts requierd (No input capacitor, bootstrap capacitor requierd). * High output : 3.5W typ (VCC=16V, RL=8, THD=10%). * Soft clip, causing little harmonic disturbance to radios. * Small pop noise at the time of power switch ON/OFF. * Built-in protector against abnormal modes (Thermal shutdown, overvoltage)
Package Dimensions
unit:mm 3018A-SIP10FD
[LA4265]
25.5 24.0 12.0 3.6 3.6
16.7 max 3.5
13.5
1.6 min
8.4
1 2.54 0.5 1.3
10 0.45 1.6
1.32
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Io peak Pd max Topr Tstg With 100x 120x 1.5mm3 Al heat sink Conditions
SANYO : SIP10FD
Ratings 25 2 7.5 -20 to +75 -40 to +150
Unit V A W
C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance Operating supply voltage range Symbol VCC RL VCC Conditions Ratings 16 8 9 to 24 Unit V V
Operating Characteristics at Ta = 25C, VCC=16V, RL=8, f=1kHz, Rg=600, See specified test circuit (based on sample application circuit).
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Output noise voltage Ripple rejection Symbol ICCO VG PO THD VNO SVRR THD=10% PO=0.5W Rg=10k, BPF=20Hz to 20kHz Rg=0, fR=100Hz, VR=0.5V 40 48 3.0 Conditions Ratings min typ 35 50 3.5 0.3 0.65 50 1.0 1.5 max 50 52 Unit mA dB W % mV dB
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
21500TH (KT)/33194HO/0237KI/8064KI/4034KI, TS No.1463-1/8
LA4265
Equivalent Circuit Block Diagram
Sample Application Circuit 1 (Recommended circuit)
Sampl Application Circuit 2 (Circuit with minimum number of external parts)
Sample Printed Circuit Pattern
No.1463-2/8
LA4265
Description of External Parts C1 (330pF) : Input short capacitor Reduces the high frequency noise when the input impedance is increased. Not required when the input impedance is decreased. C2 (100F) : Feedback capacitor Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the starting time later. C3 (0.1F : Oscillation blocking capacitor polyester film Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film capacitor that is capacitor) good in high frequency response and temperature characteristic. The use of an electrolytic capacitor may cause oscillation to occur at low temperatures. C4 (470F) : Output capacitor Decreasing the capacitance value causes insufficient power at low frequencies. C5 (470F) : Power capacitor Decreasing the capacitance value causes ripple to occur easily. Locating at a distance from the IC or removing this capacitor may cause oscillation to occur. C6 (100F) : Ripple filter capacitor Decreasing the capacitance value excessively or removing this capacitor causes ripple to occur. However, increasing the capacitance value does not always cause ripple to be reduced. Decreasing the capacitance value makes the starting time earlier. R1 (100k) : Input bias resistor Determines the bias (bias of zero potential) to be applied to the input pin and the input impedance. Not required if a variable resistor is also used as this resistor. R2 (3.3) : Resistor connected in series with oscillation blocking capacitor Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to occur. Note for Changing Voltage Gain The voltage gain can be reduced by adding an external resistor (RNF) in series with the feedback capacitor. (See VG * RNF characteristic curve). However, it should be noted that various characteristics are also changed (THD-VG, VNO-VG, VroVG). The voltage gain must not be reduced to be less than 30dB. Since the frequency response is extended and oscillation is liable to occur when the voltage gain is reduced, high-cut must be made as required. (High-cut is made by connecting a capacitor of approximately 30pF across pins (6) and (7).) External Muting If external muting is required, make the circuit as shown on next page. In this case, the pop noise is similar to that which occurs at the time of power switch ON/OFF. If the value of the series resistor is decreased, more pop noise is heard at the time of attack ; if increased, muting is hard to work. Measure against Fold-back of Output Waveform Since the input pin is zero-biased, the circuit may be saturated at an overinput, causing a part of the output waveform to be folded back (e. g. when the peak input voltage exceeds 600mV). In such a case, the fold-back of the waveform can be prevented by using the built-in diode (also can be prevented by using an external diode). When the built-in diode is used, a resistor must be connected in series with the input pin to cause the diode to conduct no overcurrent (10mA or less).
No.1463-3/8
LA4265
Fold-back Output Waveform
No.1463-4/8
LA4265
No.1463-5/8
LA4265
No.1463-6/8
LA4265
Proper Cares in Using IC * Maximum ratings If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum ratings to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum ratings are not exceeded. * Pin-to-pin short If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on the board or applying power, make sure that the space between pins is not shorted with solder, etc. * When used in radio applications When using in radios, allow a sufficient space between IC and bar antenna.
No.1463-7/8
LA4265
* Printed circuit pattern When designing the printed circuit pattern, make the power supply, output, and ground lines thick and short and arrange the pattern and parts so that no feedback loop is formed between input and output. Place power capacitor C5, oscillation blocking capacitor C3 as close to IC pins as possible to prevent oscillation from occurring. Refer to the sample printed circuit pattern. * Some plug jacks to be used for connecting to the external speaker can have the both poles short-circuited once when connecting. In this case, the load is short-circuited, which may break down the IC.
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 expor ted without obtaining the expor t 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 February, 2000. Specifications and information herein are subject to change without notice.
PS No.1463-8/8

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