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Ordering number:ENN1697B
Monolithic Linear IC
LA4555
2-Channel AF Power Amplifier for Radio, Tape Recorder Use
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 (at steady state). * 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
[LA4555]
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 With recommended PCB (See sample printed circuit pattern.) Conditions
3.5
4.26max
3.46
SANYO : DIP12F
Ratings 13 4 -20 to +75 -55 to +150
0.4
Unit V W C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Symbol VCC Stereo 6V Load resistance RL BTL 6V Stereo 9V BTL 9V Operating voltage range VCCop Conditions Ratings 6, 9 2 to 8 4 to 8 4 to 8 8 3.6 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)/90196RM/O147KI/5275MW, TS No.1697-1/10
LA4555
Operating Characteristics at Ta = 25C, VCC=9V, f=1kHz, Rg=600, RL=4, ( ) : RL=8, See specified Test Circuit.
Parameter Quiescent current Voltage gain Voltage gain difference Symbol Icco VG VG Stereo 9V Stereo 6V Rf=0, VIN=-51dBm Rf=0, VIN=-51dBm THD=10%, 6V, Stereo Output power PO THD=10%, BTL THD=10%, 9V, Stereo THD=10%, BTL Total harmonic distortion Input resistance Output noise voltage Ripple rejection Crosstalk THD ri VNO Rr CT Rg=0 Rg=10k Rg=0, f=100Hz, VR=150mV Rg=10k, f=1kHz, Vo=0dBm 40 40 PO=250mW 21 1.7 49 0.7 Conditions Ratings min typ 15 13 51 1.0 2.8 2.3 (4.5) 0.3 30 0.5 0.8 48 58 1.0 2.0 1.5 53 1 max 30 Unit mA mA dB dB W W W W % k mV mV dB dB
Equivalent Circuit Block Diagram
Sample Application Circuit : Stereo Use
No.1697-2/10
LA4555
Sample Printed Circuit Pattern (Cu-foiled side)
Sample Application Circuit : Bridge Amplifier Use 1
Sample Application Circuit : Bridge Amplifier Use 2
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. Continued on next page.
No.1697-3/10
LA4555
Continued from preceding page. 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. 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. Application Circuits Voltage gain adjust * Stereo mode The voltage gain is determined by on-chip resistor R1 (R2) and external feedback resistor Rf as follows : VG=20 log R1 [dB] Rf1+R2
Any voltage gain can be obtained by external resistor Rf.
* Bridge amplifier 1 mode Since point A is at the same potential as Vi and point B is a virtual GND point, Vo1 Vo2 R1 Vi R2+R4+Rf1+Rf2 -R3 R2+R4+Rf1+Rf2 Vi
R1+R3 Vi R2+R4+Rf1+Rf2 Vo R1+R3 VG=20 log =20log [dB] Vi R2+R4+Rf1+Rf2 Vo = Vo1 - Vo2 =
Assuming R2=R4=50, R1=R3=20k and Rf1=Rf2, the voltage gain is obtained by : VG=20 log R1 [dB] Rf1+R2
* Bridge amplifier 2 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 formula. VG=20log R2/R1+6 (dB) To reduce the voltage gain, Rf is connected and the following formula is used. VG=20log R2/Rf+R1+6 (dB)
No.1697-4/10
LA4555
Proper Cares in Using LA4555-Applied Set 1. If the transformer regulation is not as specified, the supply voltage drops momentarily when the motor is an ACpowered set is turned ON. In this case, hum noise may be generated. So, be careful of the transformer regulation. 2. DC muting To apply DC muting by controlling the NF pin, it is recommended to use the circuit configuration shown right. The potential at point A is set to 3.5 to 4V. 3. Pop noise If pop noise generated at the time of power ON/OFF disturbs you, connect a resistor of approximately 620 across the middle point and GND. 4. 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. 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. The use of the Cu-foiled area indicated by shading in the above-mentioned sample printed circuit pattern makes it possible to dissipate more heat. 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. (1) DC power supply Pd max= VCC2 2RL + Icco * VCC (For stereo use) ..... (1)
(2) AC power supply VCC2 : Supply voltage at quiescent mode VCC (Pd) : Supply voltage at Pd max VCC1 : Supply voltage at maximum output r : Voltage regulation VCC2 - VCC1 VCC1 Icco : Quiescent current 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. Example of Heat Sink Mounting
No.1697-5/10
LA4555
No.1697-6/10
LA4555
No.1697-7/10
LA4555
No.1697-8/10
LA4555
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.1697-9/10
LA4555
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.1697-10/10

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