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Ordering number: EN4022C
Monolithic Linear IC
LA4525
Dual AF Power Amplifier for Radio Cassette Recorders
Overview
The LA4525 requires only a small number of external components to drive either two 4 speakers or one 8 speaker. The output power is typically 0.65 W when driving two 4 speakers.
Package Dimensions
unit : mm
3001B-DIP8
[LA4525]
Features
. Two-channel (dual) or single-channel (BTL) operation . Requires only a few external components. . 0.65 W (typ) output power into two 4 speakers . Wide power supply range: 3 to 15 V . 8-pin DIP (No heat sink needed)
SANYO : DIP8
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Rg = 0 Note Conditions Ratings 15 1.5 -25 to +75 -40 to +150 Unit V W C C
Note: Mounted on a 50 x 50 x 1.6 mm3 heat dissipating board
Recommended Operating Conditions at Ta = 25C
Parameter Supply voltage Load resistance range Supply voltage range Symbol VCC RL VCC op Not in excess of package Pd Conditions Ratings 6 4 3 to 15 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 Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
32896HA(II)/D0192TS/4162TS No.4022-1/9
LA4525
Operating Characteristics at VCC = 6 V, Ta =25C, RL = 4 , f = 1 kHz, Rg = 600 , Dual operation unless otherwise noted
Parameter Quiescent supply current Output power Voltage gain Total harmonic distortion Output noise voltage Supply voltage ripple rejection Channel separation Input resistance Symbol ICCO PO1 PO2 VG THD VNO SVRR CH Sep Ri Condition Rg = 0 THD = 10% VCC = 9 V, RL = 8 , THD = 10% VO = 0 dBm PO = 0.1 W Rg = 0 , DIN AUDIO filter Rg = 0 , fR = 100 Hz, VR = 0 dBm VO = 0 dBm, Rg = 0 min 10 0.45 38 typ 15 0.65 1.0 40 0.2 100 43 55 100 max 30 Unit mA W W dB % V dB dB k
42 0.7 400
35 45 70
130
Equivalent Block Diagram
IN2 BTL IN
Ch2 input amp.
Predriver amp.
Output amp.
OUT2
PRE GND
POWER GND
IN1
Ch1 input amp.
Predriver amp.
Output amp.
OUT1
Pin Description
Number 1 2 3 4 5 6 7 8 Name OUT1 VCC OUT2 POWER GND BTL IN IN2 IN1 PRE GND Channel 1 output Supply voltage Channel 2 output Power amplifier ground Bridge test load input Channel 2 input Channel 1 input Preamplifier ground Description
No.4022-2/9
LA4525
Allowable power dissipation, Pd max - W
Mounted on Sanyo recommended board Independent IC
Ambient temperature, Ta - C
Dual Operation
Unit (capacitance:F)
Sample Printed Circuit Pattern
Unit (capacitance:F) 65 x 65mm2 (Cu-foiled area)
No.4022-3/9
LA4525
External Components Comparison
External components Output capacitors Input capacitors Bootstrap capacitors Feedback capacitors Filter capacitors Oscillation damping mylars Dual-mode operation total Existing Sanyo ICs * * * * * * 11 LA4525 * * x x x x 4
Pin Voltages
Pin number 1 2 3 4 5 6 7 8 Pin name OUT1 VCC OUT2 POWER GND BTL IN IN2 IN1 PRE GND Pin voltage 2.8 V 6V 2.8 V 0V 65 mV 1.4 V 1.4 V 0V
Supply voltage, VCC - V Total harmonic distortion, THD - %
Quiescent current, ICCO - mA
Output pin voltage, VN - V
Supply voltage, VCC - V
Output power, PO - W
Input voltage, VIN - mV Total harmonic distortion, THD - %
Output power, PO - W
Frequency, f - Hz
Output power, PO - W
No.4022-4/9
Power dissipation, Pd - W
Current drain, ICC - mA
Output noise voltage, VNO - mV
Frequency response - dB
Current drain, ICC - mA
Output power, PO - W
Frequency, f - Hz
Signal source resistance, Rg - Ripple rejection, SVRR - dB Channel separation, CH sep - dB Supply voltage, VCC - V Frequency, f - Hz
Power dissipation, Pd - W Output power, PO - W
LA4525
Ripple frequency, fR - Hz
No.4022-5/9
LA4525
Rising and falling waveforms
Speaker terminals
Output DC locus
BTL Operation
Unit (resistance: , capacitance:F)
Total harmonic distortion, THD - %
Output power, PO - W
Output power, PO - W
Supply voltage, VCC - V
No.4022-6/9
LA4525
Frequency, f - Hz
Output power, PO - W
Handling Instructions and Precautions
Internal Circuits
Driver
Power
Driver Unit (resistance: ) Figure 1. Input pins (6 and 7) and BTL input pin (5)
Power
Figure 2. Output pins (1 and 3)
No.4022-7/9
Power dissipation, Pd - W
Frequency response - dB
Current drain, ICC - mA
LA4525
External Components
. The output capacitors can be replaced with a single 220 F
bipolar capacitor. A larger value can cause switching noise when power is applied to the device. The voltage gain is fixed internally to 40 dB in dual mode and 46 dB in BTL mode. These values cannot be altered by connecting external components. Phase correction capacitance (600 pF/TOTAL) is incorporated in the internal stages. Oscillation damping components (R and C) are also incorporated in the output pin circuits. Power consumption Note that the 8-pin DIP does not have a heat dissipating surface and that the power dissipation ratings are critical. The maximum power dissipation of the device is 1.25 W, and 1.5 W when the device is mounted on the recommended PCB. The actual power dissipated depends on the supply voltage and the load conditions. Ensure that the device is kept within its maximum rating. For AC supplies, transformer tappings may need to be adjusted to keep the device within maximum ratings. VCC2 Pd max = + ICCO x VCC 2RL Note For BTL mode operation, the value of RL used in the calculation should be 1/2 the actual value.
. The starting time, t , can be varied by changing the value of
s
the input capacitor. A value of 2.2 F is recommended. A smaller value will result in a lower starting time, and a larger value, a higher starting time.
. . .
. The output capacitor should have a value of 470 F. A lower . .
value will cause the low-frequency roll-off and low-power characteristics to deteriorate. A value of 470 F is recommended for the power supply capacitor, although this can change according to the design setup conditions. In dual mode, BTL IN (the channel 2 negative feedback connection) should be left floating.
BTL mode
. The output capacitors should have a value of 470 F. If these
are omitted, a ``popping'' noise occurs. Also, any output offset will cause a current to flow which could damage the load under quiescent DC conditions.
. If the speaker plug jacks short to ground when connected, a the . protection resistor shouldatbeorinserted inrated output line. If the device is operated near its values, these . .
values can be exceeded by small changes in operating conditions, leading to device breakdown. Accordingly, ensure that a safety margin is maintained so as not to exceed the maximum ratings. Check the PCB surface after soldering to ensure that no pins have been accidentally shorted. Any short between pins could cause poor operating characteristics or permanently damage the device when power is applied. If making the PCB, check the printed wiring to ensure that no feedback loops occur between input and output.
RL
No.4022-8/9
LA4525
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 March, 1996. Specifications and information herein are subject to change without notice. PS No.4022-9/9

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