View 1505_962966.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ordering number:ENN2088E
Monolithic Linear IC
LA4558
2-Channel AF Power Amplifier
Features
* Low quiescent current. * On-chip 2 channels permitting use in stereo and bridge amplifier applications. * High output. * Minimum number of external parts required. (9 pcs. munimum) * Good ripple rejection (60dB). * Soft tone at the output saturation mode. * Good channel separation. * Easy thermal design. * Small pop noise at the time of power supply ON/OFF.
Package Dimensions
unit:mm 3022A-DIP12F
[LA4558]
12 7
7.62 6.45
1
5.12 19.4
6
0.51min
0.81
0.5 2.54
3.6
1.3
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 Quiescent Operating With recommended PCB Conditions
3.5
4.26max
3.46
SANYO : DIP12F
Ratings 15 12 4 -20 to +75 -55 to +150
0.4
Unit V V W
C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance Operating voltage range Symbol VCC RL VCCop Stereo BTL Conditions Ratings 7.5 to 9.0 3 to 8 8 4.5 to 12 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
21800TN (KT)/9140TA/9147AT/2146KI, TS No.2088-1/9
LA4558
Operating Characteristics at Ta = 25C, VCC=9V, f=1kHz, Rg=600, RL=4, VG=50dB, See specified Test Circuit.
Parameter Quiescent current Voltage gain Voltage gain difference Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection Crosstalk Symbol Icco VG VG PO THD ri VNO Rr CT Rg=0, stereo Rg=10k, stereo Rg=0, fR=100Hz, VCCR=0dBm Rg=10k, Vo=0dBm 55 45 Rg=0 VIN=-50dBm VIN=-50dBm THD=10%, Stereo THD=10%,BTL (RL=8) PO=250mW 21 48 1.7 Conditions Ratings min ty p 20 50 2.4 4.5 0.3 30 0.5 0.8 60 55 1.0 2.0 1.0 max 40 52 1 Unit mA dB dB W W % k mV mV dB dB
Equivalent Circuit Block Diagram
Sample Application Circuit : Stereo Use
No.2088-2/9
LA4558
Sample Printed Circuit Pattern (Cu-foiled side)
Sample Application Circuit : Bridge Amplifier Use
Description of External Parts C1 (C2) : Feedback capacitor. The low cutoff frequency is determined by the following formula. 1 fL : Low cutoff frequency fL= 2C1Rf Rf : Feedback resistance Since this capacitor as well as decoupling capacitor affects the starting time, the capacitor value must be fixed with the necessary low frequency band fully considered. C3 (C4) : Bootstrap capacitor. The output at low frequencies depends on this capacitor. Decreasing the capacitor value lowers the output at low frequencies. A capacitor value of 47F or more is required. C5 (C6) : Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and temperature characteristic. The use of an electrolytic capacitor, ceramic capacitor may cause oscillation to occur at low temperatures. C7 (C8) : Output capacitor. The low cutoff frequency is determined by the following formula. 1 fL : Low cutoff frequency fL= 2C7RL RL : Load resistance To make the low frequency response in the bridge amplifier mode identical with that in the stereo mode, the capacitor value must be doubled. C9 : Decoupling capacitor CD1. 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 muting circuit, affects the starting time. C10 : Power source capacitor. C11 : Decoupling capacitor CD2. Used for the ripplie filter. Particularly effective for transient characteristic.
No.2088-3/9
LA4558
Application Circuits Voltage gain adjust * Stereo mode The voltage gain is determined by on-chip resistor R1 (R2) and external feedback resistor RNF as follows : VG=20 log R1 [dB] RNF+R2
Any voltage gain can be obtained by external resistor RNf.
* Bridge amplifier mode
The CH1 is a noninverting amplifer and the CH2 is an inverting amplifier. The total voltage gain, being apparently higher than that of the CH1 by 6dB, is approximately calculated by the following formura. VG=20log R2/R1+6 (dB) To reduce the voltage gain, Rf is connected and the following formura is used. VG=20log R2/Rf=R1+6 (dB) Proper cares in using LA4558-applied set 1. Slider contact noise of variable resistor Since the input circuit uses PNP transistors, no input coupling capacitor is required. However, if slider contact noise of the variable resistor presents any problem, connect a capacitor in series with input. 2. Pop noise If pop noise generated at the time of power ON/OFF disturbs you, connect a resistor of 500 to 1k across the middle point and GND. Thermal Design Since the DIP-12F package is such that the Cu-foiled area of the printed circuit board is used to dissipate heat, make the Cu-foiled area in the vicinity of the heat sink of the IC as large as possible when designing the printed circuit board. Power dissipation Pd is increased depending on the supply voltage and load. So, it is recommended to use the printed circuit board together with the heat sink. The following is a formula to be used to calculate Pd (for stereo use). For AC power supply, however, it is recommended to actually measure Pd on the transformer of each set. For bridge amplifier use, Pd is calculated at 1/2 of the load.
No.2088-4/9
LA4558
(1) DC power supply Pd max= VCC2 2RL + Icco * VCC (2-channel) ............ (1) (For stereo use)
(2) AC power supply : Supply voltage at quiescent mode VCC2 VCC (Pd) : Supply voltage at Pd max : Supply voltage at maximum output VCC1 r Icco : Voltage regulation VCC2 - VCC1 VCC1 : Quiescent current
Line regulation Pd max= where VCC (Pd)= 1+ VCC(Pd)2 + Icco * VCC (Pd) (For stereo use) .............. (2) 2RL (1+r) VCC1 r * VCC1 x 2 * * RL
PoRmax
L
Example of Heat Sink Mounting Method The heat sink must be of such a shape as to be able to dissipate heat from the IC plastic area and fin area and is soldered to the printed circuit board as shown below. For the size of the heat sink, refer to the Pd - Ta characteristic. The material of the heat sink is recommended to be copper or iron which is solderable. It is recommended to apply silicone grease to the IC plastic area to reduce thermal resistance between the heat sink and the IC plastic area.
Proper Cares in Using IC 1. 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. 2. 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 and applying power, make sure that the space between pins is not shorted with solder, etc. 3. Load short : If the IC is used with the load shorted for a long time, breakdown or deterioration may occur. Be sure not to short the load. 4. When the IC is used in radios or radio cassette tape recorders, keep a good distance between IC and bar antenna. 5. When making the board, refer to the sample printed circuit pattern. 6. It should be noted that some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when connecting.
No.2088-5/9
LA4558
No.2088-6/9
LA4558
No.2088-7/9
LA4558
No.2088-8/9
LA4558
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.2088-9/9

▲Up To Search▲

Price & Availability of 1505

	To Download 1505 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .