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Ordering number: EN1339D
Monolithic Linear IC
LA4145
0.6 to 0.9 W AF Power Amplifier for Radio Cassette Recorders
Features
Package Dimensions
unit : mm
. The LA4145 is especially suited for use in cassette tape . . . . .
recorder, radio-cassette, recorder, stereo cassette player applications. 0.6 W typ/VCC = 6.0 V, RL = 8 , THD = 10% 0.9 W typ/VCC = 6.0 V, RL = 4 , THD = 10% Minimum number of external parts required Soft clip Small pop noise at VCC ON/OFF mode Voltage gain fixed at 50 dB. An external resistor can be connected to reduce this value.
3017C-SIP9
[LA4145]
SANYO : SIP9
Specifications
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 50 x 50 mm2 with PCB Quiescent mode Operating mode RL = 8 Conditions Ratings 9 8 500 0.9 -20 to +70 -40 to +150 Unit V V mA W C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance Operating voltage range Symbol VCC RL VCC Conditions Ratings 6 4 to 8 3.6 to 8 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
53096HA(II)/O217KI/N055MW/4034/N163KI,TS No.1339-1/6
LA4145
Operating Characteristics at Ta = 25C, VCC = 6.0 V, RL = 8 , Rg = 600 , f = 1 kHz
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection ratio Symbol ICCO VG PO THD ri VNO SVRR Conditions LA4145 48 THD = 10%, RL = 4 THD = 10%, RL = 8 PO = 0.1 W Rg = 10 k, B.P.F. = 20 Hz to 20 kHz Rg = 0, fR = 100 Hz, VR = 150 mV 0.45 min typ 10 50 0.9 0.6 0.2 30 0.6 -40 max 20 52 Unit mA dB W W % k mV dB
1.0 1.2
-35
Proper care in changing voltage gain
An external resistor can be connected in series with the feedback capacitor at pin 2 to reduce the voltage gain. (See RNF-VG characteristic.)
IC usage notes
1. 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. Radio applications For use in radio applications, keep a good distance between IC and bar antenna. Printed circuit pattern When designing the printed circuit pattern, make the power supply, output, and ground lines thicker and shorter and determine the pattern and parts placement so that no feedback loop is formed between input and output. Place power capacitor C6, oscillation blocking capacitor C3 as close to the IC pin as possible to prevent oscillation from occurring. (See the sample printed circuit pattern.)
2.
3. 4.
Description of external parts
C1 (47 F) Feedback capacitor (NF capacitor) Low cutoff frequency fLdepends on this capacitor. fL = 90 Hz for C1 = 47 F. Decreasing the capacitor value makes the starting time earlier.
C2 (100 F) C3 (0.15 F) C4 (470 F) C5 (47 F) C6 (470 F) R1 (30 k)
Bootstrap capacitor Oscillation blocking capacitor Output capacitor Decoupling capacitor Power capacitor Input bias resistor Serves to reject ripple. The starting time depends on this capacitor. Increasing the capacitor value makes the starting time later. Place as close to the power pin of the IC as possible. Serves to apply input bias. The input impedance almost entirely depends on this resistor value. If a variable resistor also serves for this purpose, this resistor can be omitted. In this case, it is recommended to use a resistor of 30 k. It is recommended to use a polyester film capacitor being good in temperature characteristic, high frequency characteristic.
No.1339-2/6
LA4145
Sample Application Circuit: AF power amplifier
Allowable power dissipation, Pd max - mW
Pd max - Ta
50 x 50 mm2 PCB
Ambient temperature, Ta - C
Sample Printed Circuit Pattern (Cu-foiled area)
+
VCC +C6 470F
C5 47F
9
LA4145
1
INPUT
+
C2 100F R1 30k OUTPUT C4 470 F C3 0.15F polyester film capacitor
C1 47F
42.5 x 70.0mm 2
ICCO - VCC Quiescent current, ICCO - mA
PO - VCC
Output power, PO - W
Supply voltage, VCC - V
Supply voltage, VCC - V
No.1339-3/6
LA4145
THD - PO Allowable power dissipation, Pd - W Total harmonic distortion, THD - % Pd - PO
Output power, PO - W Pd - PO Allowable power dissipation, Pd - W
Output power, PO - W VG - f
Output power, PO - W VNO - Rg Total harmonic distortion, THD - % Output noise voltage, VNO - mV
Voltage gain, VG - dB
Frequency, f - Hz THD - f
B.P.F.= 20Hz to 20kHz
Without B.P.F.
With B.P.F.
Signal source resistance, Rg - SVRR - VG Output noise voltage, VNO - mV
Frequency, f - Hz VNO - VG
B.P.F.= 20Hz to 20kHz
SVRR - dB
Without B.P.F.
With B.P.F.
Voltage gain, VG - dB
Voltage gain, VG - dB No.1339-4/6
LA4145
VG - RNF Output noise voltage, VNO - mV VNO - VCC
B.P.F.=20Hz to 20kHz
Voltage gain, VG - dB
External feedback resistor, RNF - tS - C1, C5
Supply voltage, VCC - V tS - VCC
Starting time tS - s
Starting time, ts - s
Complete discharge
Complete discharge
C1, C5 - F ICCO - Ta Quiescent current, ICCO - mA
Supply voltage, VCC - V PO - Ta
Ambient temperature, Ta - C
Output power, PO - W
Ambient temperature, Ta - C
No.1339-5/6
LA4145
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 May, 1996. Specifications and information herein are subject to change without notice. PS No.1339-6/6

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