LA4268

Ordering number: ENN7093 Monolithic Linear IC LA4268 10 W Monaural Power Amplifier Overview The LA4268 is a 10 W power amplifier intended for televisions. This IC has a series of pin compatible monaural and 2channel power amplifiers, thus allows the end product to use a common circuit boad. Package Dimensions unit: mm 3248-SIP10HD [LA4268] Features • Television audio output. • Pin compatible with the LA4266 (3 W)/4267 (5 W) and the LA4276 (3 W × 2)/4277 (5 W × 2)/4278(10 W × 2). • Package: SIP-10HD (2.54 mm pitch, straight pins). • Thermal protection circuit and overvoltage protection circuit on chip. • Output power: 10 W (VCC = 28 V/RL = 8 Ω). 25.6 C0.7 3.4 (10.0) 2.0 2.4 1.0 min 1 1.37 2.54 0.5 1.15 10 4.5 13.9 11.2 (11.8) 15.4max 0.4 1.2 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Maximum output current Allowable power dissipation Thermal resistance Operating temperature Storage temperature Symbol VCC IO peak Pd max Infinite heat sink Rg = 0 Conditions SANYO: SIP10HD Ratings 35 2.5 15.0 3.0 –20 to +75 –40 to +150 Unit V A W °C/W °C °C θ j-c Topr Tstg Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Load resistance Operating supply voltage range Symbol VCC RL VCC op Range does not exceed Pd Conditions Ratings 28 8 10 to 34 Unit V Ω 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 32902RM (II) No. 7093-1/6 LA4268 Operating Characteristics at Ta = 25°C, VCC = 28 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω, with specified board, in specified circuit Parameter Quiescent current Voltage gain Total harmonic distortion Output noise voltage Output power Ripple rejection Symbol ICCO VG THD VNO PO SVRR Rg = 0 VO = 0 dBm PO = 0.5 W Rg = 10 kΩ, BPF = 20 Hz to 20 kHz THD = 10 % Rg = 0, fr = 100 Hz, Vr = 0.5 Vrms 8.0 45 38 Conditions min Ratings typ 35 40 0.1 0.25 10 55 max 70 42 0.8 1.0 Unit mA dB % mV W dB 16 Pd max – Ta 15 15 Allowable power dissipation, Pd max – W 14 12 11.7 10 8 6 5.8 4 2 2 Infinite heat sink 100 × 100 × 1.5 mm3 AI heat sink Mounting torque 39N•cm Flat washer Silicone grease applied 7.02 50 × 50 × 1.5 mm3 3.48 No heat sink 1.2 0 20 40 60 80 100 120 140 160 0 --20 Ambient temperature, Ta – °C ILA00835 Pin Assignment and Equivalent Circuit Diagram 30 kΩ NC 1 NC 2 Filter 3 300 Ω PRE GND 4 5 IN NF 6 C3 100 µF OUT 7 Power GND 8 C5 0.1 µF VCC 9 NC 10 C1 100 µF + R1 750 Ω C2 4.7 µF C4 1000 µF + + + + RL * For Muting, add a resistor between pin 3 and GND. 750 Ω for the LA4266/67/68, 200 Ω for the LA4276/77. R2 1.0 Ω C6 1000 µF No. 7091-2/6 LA4268 Description of External Parts C1: Ripple filter capacitor Decreasing the capacitance value reduces ripple rejection. This capacitor also affects the starting time; decreasing the capacitance value makes the starting time earlier. C2: Input capacitor Because the DC potential of the input pin is not zero, this capacitor can not be omitted. Decreasing the capacitance value to an extremely low level lowers the low frequency response. C3: Feedback capacitor Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the starting time later. C4: Output capacitor Decreasing the capacitance value causes insufficient power at low frequencies. C5: Oscillation blocking capacitor Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film capacitor that has good high frequency response and temperature characteristics. The use of an electrolytic capacitor or a ceramic capacitor may cause oscillation to occur at low temperatures. C6: Power capacitor Decreasing the capacitance value causes ripple to occur easily. Locating at a distance from the IC or removing this capacitor may cause oscillation to occur. R1: Mute resistor Refer to supplementary discussion “External Muting.’’ R2: Resistor connected in series with oscillation blocking capacitor Prevents phase shift in conjunction with the oscillation blocking capacitor so that oscillation does not easily occur. There is an optimal value for the resistor; increasing or decreasing the resistance causes oscillation to occur easily. External Muting • Pull down the electric potential of the ripple filter pin (pin 3). Muting becomes possible by inserting the discharge resistor R1 between pin 3 and GND. If the resistance value of R1 is too low, a popping noise is generated; if the resistance value is too high, the muting effect is reduced. (A value of 750 Ω is recommended for R1.) NC 2 Filter 3 PRE GND 4 + C1 R1 Mute SW Voltage Gain The voltage gain is fixed at 40dB by the ratio of the 30 kΩ and 300 Ω internal resistors. Therefore, it is not possible to use this IC with a voltage gain greater than 40 dB. Although it is possible to use this IC with a voltage gain of less than 40 dB by adding a feedback resistor (RNF) and external resistors (R) as shown in the diagram, doing so causes oscillation to occur easily. Therefore, do not use this IC with a voltage gain of 30dB or less. 300 Ω RNF 30 kΩ Rf OUT 6 7 IN 5 NF R + C3 + C4 RL + C5 R2 C2 No. 7091-3/6 LA4268 Notes on Using the IC • Maximum ratings When this IC is used near its maximum ratings, it is possible that a slight fluctuation in the operating conditions could cause the maximum ratings to be exceeded, damaging the IC. Therefore, allow for an adequate safety margin in regards to supply voltage, etc., so that the IC is never used under conditions that exceed its maximum ratings. • Short circuit between pins Applying power to the IC while a short circuit exists between two pins can cause damage or deterioration in the IC. Therefore, after mounting the IC on a board, make sure that there are no solder bridges, etc., causing a short circuit between any of the pins before applying power to the IC. • Using the IC in a radio When using this IC in a radio, make sure that there is enough distance between the IC and the bar antenna. • Printed circuit pattern When designing the printed circuit pattern, keep power, output, and ground lines thick and short, and determine the placement of the pattern and the components in such a way as to prevent the generation of an I/O feedback loop. In addition, power supply capacitor C6 and oscillation blocking capacitor C5 should be placed as close as possible to the IC pins in order to prevent oscillation. No. 7091-4/6 LA4268 ICCO – VCC Rg = 0 RL = 8 Ω 40 35 30 25 20 15 10 5 0 0 5 10 16 14 PO – VCC RL = 8 Ω f= 1 kHz THD = 10% Quiescent current, ICCO — mA Output power, PO — W 15 20 25 30 35 40 45 ILA00844 12 10 8 6 4 2 0 8 12 16 20 24 28 Supply voltage, VCC — V 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 10 23 5 7100 23 5 71 k 23 5 710 k Supply voltage, VCC — V 100 7 5 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 0.1 32 36 ILA00845 THD – f Total harmonic distortion, THD -- % RL = 8 Ω PO = 0.5 W VCC = 28 V THD – PO VCC = 28 V RL = 8 Ω Total harmonic distortion, THD — % f = 10 kHz f = 1 kHz f = 100 Hz 2 3 5 7 1.0 2 3 5 7 10 ILA00855 Frequency, f — Hz 23 57 100 k ILA00854 Output power, PO — W 2 Response – f Output noise voltage, VNO — mVrms RL = 8 Ω VCC = 28 V 0.5 VNO – Rg RL = 8 Ω DIN Audio VCC = 28 V 1 0.4 Response — dB 0 --1 0.3 --2 0.2 --3 0.1 --4 --5 10 23 5 7100 23 Frequency, f — Hz 5 71 k 23 5 710 k 23 57 100 k ILA00856 0 10 23 5 7100 23 5 71 k 23 5 710 k 23 Input signal source resistance, Rg — W 7 57 100 k ILA00857 1.0 Vro – Vr Pd – PO Output ripple voltage, Vro — mVrms Power dissipation, Pd — W Rg = 0 f = 100 Hz 7r VCC = 28 V 5 VCC = 28 V RL = 8 Ω 6 f = 1 kHz Pd = VCC x ICC — PO 5 4 3 3 2 2 1 0.1 3 5 7 0.1 2 3 5 0 0.1 Ripple voltage, Vr — V 1.0 ILA00858 7 2 3 5 7 1.0 2 3 5 Output power, PO — W 7 10 ILA00859 No. 7091-5/6 LA4268 0.5 s/DIV 0.5 s/DIV Pop noise waveform (1 V/DIV) SP terminal AC 0 0 Pop noise waveform (1 V/DIV) Output DC Middle point rise waveform (5 V/DIV) Middle point fall waveform (5 V/DIV) 0 0 ILA00951 Power on output waveform Power off output waveform ILA00952 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, 2002. Specifications and information herein are subject to change without notice. PS No. 7091-6/6