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Ordering number:ENN1277E
Monolithic Linear IC
LA4445
5.5W 2-Channel AF Power Amplifier
Features
* Dual channels. Output : 5.5Wx2 (typ.) * Minimun number of external parts required. * Small pop noise at the time of power supply ON/OFF and good starting balance. * Good ripple rejection : 46dB (typ.) * Good channel separation. * Small residual noise (Rg=0). * Built-in protectors. a. Thermal protector b. Overvoltage, surge protector c. Adjacent pins (9-10, 9-8) short protector
Package Dimensions
unit:mm 3049A-SIP12H
[LA4445]
27.0 20.0 4.0
7.0
1.0min
1 2.5 2.0 0.5 1.0
12
6.0
13.2max
8.4
R1.7 11.8
0.4 2.0
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Surge supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max1 VCC max2
VCC(surge) IO peak
SANYO : SIP12H
Conditions Quiescent (t=30s) Operating t0.2s 1 channel See Pd max - Ta characteristic.
Ratings 25 18 50 3.5 15 -20 to +75 -40 to +150
Unit V V V A W C C
Pd max Topr Tstg
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance Operating voltage range Symbol VCC RL VCC op 2 channels Conditions Ratings 13.2 4 10 to 16 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
21500TH (KT)/90196RM/N283KI, TS No.1277-1/7
LA4445
Operating Characteristics at Ta = 25C, VCC=13.2V, RL=4, f=1kHz, Rg=600, with 100x100x1.5mm3 Al heat sink, See specified Test Circuit.
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection Channel separation Symbol Icco VG PO THD ri VNO Rr Ch sep Rg=0 Rg=10k Rg=0, VR=200mV, fR=100Hz Rg=10k, VO=0dBm 45 49.5 THD=10%, 2 channels PO=1W 5.0 Conditions Ratings min typ 75 51.5 5.5 0.15 30 0.6 1.0 46 55 1.0 2.0 1.0 max 150 53.5 Unit mA dB W % k mV mV dB dB
Equivalent Circuit Block Diagram
Sample Application Circuit
No.1277-2/7
LA4445
Sample Printed Circuit Pattern
Proper Cares in Mounging Radiator Fin 1. The mounting torque is in the range of 39 to 59N * cm. 2. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC. With case outline dimensions L and R referred to, the screws must be tightened with the distance between them as close to each other as possible.
3. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined by JIS. Washers must be also used to protect the IC case. 4. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on the junction surface, it must be applied uniformly on the whole surface. 5. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.
No.1277-3/7
LA4445
Description of External Parts C1 (C2) : Feedback capacitor Low cutoff frequency fL depends on this feedback capacitor. Increasing the capacitor value makes the starting time later C3 (C4) : Bootstrap capacitor If the capacitor value is decreased, the output at low frequencies goes lower. (Recommended value : 47F min.) C5 (C6) : Oscillation blocking capacitor Polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended. The capacitor value can be reduced to 0.047F depending on the stability of the board. C7 (C8) : Output capacitor The low cutoff frequency depends on this output capacitor. In bridge connection applications the output capacitor must be normally connected. C9 : Decoupling capacitor Used for the ripple filter. Since the rejection effect is saturated at a certain capacitor value, it is meaningless to increase the capacitor value more than needed. This capacitor, being also used for the time constant of the pop noise preventer, affects the starting time. Too small a capacitor value makes the pop noise level higher. C10 : Power source capacitor. R1 (R2) : Oscillation blocking filter resistor. IC Application 1. V.G. can be reduced by connecting RNF' to the N.F. pin (pins 1, 6) V.G. is calculated by the following formula. VG=20log Rf / (RNF+RNF') where Rf=20k, RNF=50 The usable lower limit of VG is 36dB or thereabouts. When setting VG, oscillation and high cutoff frequency fH must be considered. 2. External audio muting method
Proper Cares in Using IC * If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating 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 is not exceeded. * Printed circuit board When making the board, refer to the sample printed circuit pattern. No feedback loop must be formed between input and output. Both Pins GND and Power GND must be shorted at the root of IC pin so that the common impedance can be reduced. * Others The radiator fin on the package must be normally connected to GND. Some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when connecting. In this case, the load is shorted, which may break down the IC.
No.1277-4/7
LA4445
No.1277-5/7
LA4445
Sample Application Circuit : Bridge connection application
No.1277-6/7
LA4445
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.1277-7/7

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