Ordering number : ENN8178 SANYO Semiconductors DATA SHEET Monolithic Linear IC LA4632 10 W Two-Channel BTL AF Power Amplifier for Audio Applications Overview The LA4632 is a pin compatible version of the LA4631 (5 W × two channel single ended type) BTL power amplifier IC. The LA4632's pin compatibility makes it possible to share a common printed circuit board among a series of end products differentiated by power rank. Note that the LA4631 has a pin 13, and that it is necessary to provide a hole for this pin if the same printed circuit board is to be shared. Also, some of the external components used differ. The LA4632 provides a full complement of built-in protection circuits, including protection against shorting to the power supply, shorting to ground, load shorting, and excessive temperatures. Functions and Applications • Two-channel BTL power amplifier for audio applications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Rated value Unit Maximum supply voltage VCC max With no input signal 24 Maximum output current IO peak Per channel 2.5 A Allowable power dissipation Pd max With an infinitely large heat sink 25 W Maximum junction temperature Tj max V 150 °C Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +150 °C Operating Characteristics at Ta = 25°C Parameter Symbol Recommended supply voltage Recommended load resistance range Allowable operating supply voltage range *1 Conditions Rated value VCC RL op VCC op Unit 13 V 4 to 8 Ω When RL = 8 Ω 5.5 to 20 V When RL = 6 Ω 5.5 to 17 V When RL = 4 Ω 5.5 to 13 V Caution: VCC, RL, and the output level must be set for the size of the heat sink used so that the Pd max range is not exceeded. *1. When both channels are operating such that IOpeak = 1.0 A per channel is exceeded. If the IC is operated such that IOpeak = 1.0 A per channel is not exceeded, the IC can be used in the range 5.5 to 20 V (in the ranges where Pd max is not exceeded) with a load of RL = 4 to 8 Ω. 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 33105TN (OT) No.8178-1/8 LA4632 Operating Characteristics at Ta = 25 °C, VCC = 13 V, RL = 6 Ω, f = 1kHz, Rg = 600 Ω Parameter Symbol Quiescent current drain ICCO Standby current Ist Voltage gain VG Total harmonic distortion Rg = 0, no signal VO= 0 dBm THD Output power Conditions Ratings min typ 40 33 PO = 1 W PO THD = 10 % Output offset voltage VN offset Output noise voltage VNO Rg = 0 8.5 70 150 mA 0 10 µA 35 37 dB 0.06 0.2 10 –300 Rg = 0, BPF = 20 Hz to 20 kHz SVRR Rg = 0, fR = 100Hz, VR = 0 dBm 50 60 Channel separation CH sep Rg = 10 kΩ, VO = 0 dBm 50 60 14 20 Ri 0.3 dB 26 kΩ V VST The pin 5 voltage such that the amplifier is on 2.5 10 Mute pin applied voltage VM The pin 6 voltage such that muting is applied 1.7 3 VO = 1 Vrms, BPF = 20 Hz to 20 kHz 80 ATTM 90 mV mVrms dB Standby pin applied voltage Muting attenuation % W +300 0.14 Supply voltage rejection ratio Input resistance Unit max V dB Package Dimensions unit : mm 3049B 26.8 (20.0) (11.8) 13.2max 6.0 (R1.7) 7.0 1 1.0min (8.4) 4.0 12 (2.4) 2.0 0.4 2.0 1.0 0.5 SANYO : SIP12H Pd max -- Ta Allowable power dissipation, Pd max - W 30 25 Aluminum heat sink, t = 1.5 mm Tightening torque: 39 N cm With silicone grease applied With an infinitely large heat sink θf=3°C/W 20.8 θf=4°C/W 20 15 13.9 θf=7°C/W θjc=2°C/W 10.4 θf=10°C/W 10 5 3.1 0 --20 No radiator fin 0 20 40 60 80 100 Ambient temperature, Ta - °C 120 140 160 ILA06994 No.8178-2/8 LA4632 Block Diagram SIGNAL MUTE 5 7 STAND BY VCC 6 CH1 +OUT1 12 IN1 + 2 Output amplifier – 11 Input amplifier PRE GND –OUT1 Protection circuits Protection against shorting to the power supply, shorting to ground, load shorting, and excessive temperatures 3 PWR GND 8 Input amplifier IN2 10 +OUT2 + 4 Output amplifier – 9 –OUT2 CH2 Ripple filter/startup timer 1 No.8178-3/8 LA4632 Application Circuit Example/Test Circuit Diagram IN2 STBY MUTE VCC +OUT2 --OUT2 PWR GND --OUT1 +OUT1 1 2 3 4 5 6 7 8 9 10 11 12 Mute 5V C7 0.1µF R3 2.2Ω C6 0.1µF C9 0.1µF RL R2 2.2Ω + C8 0.1µF RL R5 2.2Ω + R4 2.2Ω + C5 1000µF 25V + STBY 5V + C4 10µF 10V PRE GND R1 15kΩ IN1 C2 4.7µF 16V RF C1 4.7µF 16V C3 47µF 25V LA4632 VCC Top view • Caution Although the LA4632 is basically pin compatible with the LA4631, there are certain differences in the external components and the way the devices are used. External Components and Usage Notes C1, C2: These are input coupling capacitors; we recommend a value of 4.7 µF or lower. A zero bias type circuit is used for the LA4632 input circuits, and the input pin potential is close to zero volts. Therefore the polarity must be considered in conjunction with the DC potential of the circuit connected to the LA4632 front end. If there is a large potential difference between the plus and minus sides of the input capacitors, the stabilization time when power is first applied can be reduced by reducing the value of the input capacitors, as long as that reduction does not compromise the low-band characteristics. C3: This capacitor is used both as a ripple filter and to set the amplifier's startup time. A value of 47 µF is recommended. With this value, the startup time (the time from the point power is first applied until the point an output is generated) will be about 0.6 to 0.7 seconds. (See note 1.) C4, R1: This RC circuit is used for mute smoothing. C4 is required even if the muting function is not used. (See note 2.) C5: Power supply capacitor C6 to C9, R2 to R5: These components form oscillation prevention RC circuits. We recommend using polyester film capacitors (Mylar capacitors) with excellent thermal characteristics for C6 through C9. (R2 to R5 are 2.2 Ω 1/4 W resistors.) *1. Startup time The LA4632 features a built-in startup circuit that can be adjusted somewhat by changing the value of the capacitor connected to pin 1. (With the recommended value of 47 µF, the time is about 0.6 to 0.7 seconds (a time that changes somewhat with VCC). That time can be extended to about 0.8 to 0.9 seconds by inserting a capacitor with a value of 10 µF in parallel.) Since using a capacitor with a value smaller than the recommended value may reduce the SVRR between ground and the output, we cannot recommend using a smaller value. *2. Signal muting function The signal muting function is turned on by connecting the recommended RC circuit (10 µF, 15 kΩ) to pin 6 and applying a voltage of +5 V to the mute pin. This circuit implements a muting function with extremely low impulse noise. This RC circuit is used to smooth the attack and recovery times, and since the 10 µF capacitor also has the function of smoothing after the startup time, it is required even if the signal muting function is not used. No.8178-4/8 LA4632 Pin 6 IC internal equivalent circuit 15kΩ Imute 2kΩ 6 10µF 20kΩ Mute pin applied voltage 2kΩ +5V Other items Standby function Pin 5 IC internal equivalent circuit Use ISTB = up to 500µA as an initial target. 2VBE RSTB 15kΩ 1.5kΩ Standby pin applied voltage 30kΩ 5 When an voltage of +5 V is applied to the mute pin through the external 15 kΩ resistor, the pin 6 voltage becomes about 1.85 V. (The muting function activation level in the specifications is 1.7 V minimum.) The pin 6 influx current (Imute) at this time will be roughly 210 µA. Although it is possible to change the mute pin applied voltage or the values of the mute pin external components, if the pin 6 voltage (and pin 6 influx current) is too high, or if the pin 6 external component time constant is too short, the amplitude of impulse noise in the system may rise. This phenomenon must be taken into account when designing this circuit. The IC's pin 5 is a standby pin. The amplifier is turned on when the voltage applied to this pin is about 2 V or higher. (The value in the specifications is 2.5 V minimum.) If a voltage of +5 V is directly applied to the standby pin, the pin 5 influx current will be about 230 µA. 5 V – 2 VBE (about 1.55 V) ISTB = = 230 µA 15 kΩ If a voltage that exceeds the upper limit voltage given in the specifications (10 V) is applied as the standby pin voltage, calculate a value for an external resistor RSTB from the following formula so that the pin 5 influx current does not increase excessively (use a value of under about 500 µA as the initial target value). RSTB = Applied voltage - 2VBE (about 1.55 V) ISTB (Under 500 µA) – 15 kΩ Usage Notes Notes on the Maximum Ratings If this IC is used in the vicinity of the maximum ratings, even the slightest fluctuations in the operating conditions could cause those ratings to be exceeded, making the destruction of the device possible. Applications must be designed with adequate margins in the supply voltage and other parameters so that the devices is always used in ranges that do not exceed the maximum ratings. Notes on Protection Circuits While the LA4632 provides a full complement of built-in protection circuits, care is required in their use. In particular, be careful not to inadvertently short IC pins to each other. [Notes on the short to power, short to ground, and load shorting protection circuit] • This protection circuit operates when an abnormal short such as a short to power (a short between an output and VCC), a short to ground (a short between an output and ground), or a load short (a short between the output ± sides) occurs. Although this circuit may not operate when the VCC voltage is under about 9 V, the thermal protection circuit is thought adequate to protect the IC in that case. • This protection circuit is the type that continues to operate while the above listed short state continues and recovers automatically as soon as the abnormality is resolved. However, there are cases where, depending on the operating conditions, the protection circuit locks and the protection operation continues. In these cases, the protection circuit can be cleared by switching to standby mode or cutting and reapplying power. • Note that if the output is shorted to power in the state where the IC is in the standby state (amplifier operation is turned off) and VCC is over about 20 V, an offset may occur between the plus and minus outputs. If a load is connected in this state, current may flow in through the load and the IC may be destroyed. • In the following usage conditions, a symptom in which the output audio is cut off at high outputs due to protection circuit operation. Depending on the end product specifications, it may be necessary to check for this phenomenon. • Situations where both channels are operating in a manner that the IOPeak per channel exceeds 1 A at low RL (high loads) and high VCC (The higher the chip temperature the easier it is for this phenomenon to occur.) The "Allowable operating supply voltage range (VCC op)" item in the operating conditions specifications provides specific target operating conditions so that the above phenomenon will not occur under severe usage conditions (high temperatures, high outputs. (See the different VCC op ranges for different RL values.) No.8178-5/8 LA4632 [Thermal Protection Circuit] • The LA4632 includes an on-chip thermal protection circuit to prevent degradation or destruction of the IC due to abnormal heating. If this IC's junction temperature (Tj) rises above 160°C due to and insufficient heat sink or other reason, the thermal protection circuit will operate and gradually reduce the output signal level. This protection function clears automatically as the temperature falls. Notes on Printed Circuit Boards When designing the printed circuit board pattern, keep the inputs and VCC, and the inputs and the outputs, away from each other. (This is to prevent increased distortion, oscillation, and other problems.) Notes on Heat Sink Attachment Foreign matter such as metal chips must not be trapped between the IC's heat sink and the externally attached heat sink. If a grease is used between the IC and the external heat sink, be sure to apply the grease evenly to the whole contact surface. Other Notes The LA4632 is a BTL power amplifier IC. When connecting test equipment, the test equipment used for the input system and the test equipment used for the output system must not share the same ground. 60 50 40 30 Ω Ω 4Ω 14 12 10 8 6 20 4 10 2 0 0 4 2 6 8 10 12 14 16 18 20 Supply voltage, VCC - V 22 24 4 10 3 2 1.0 7 5 3 f=10kHz 0.1 f=1kHz f=100Hz 7 5 3 0.1 2 3 5 7 1.0 2 3 5 Output power, PO - W 7 10 2 3 ILA06997 10 12 14 16 18 20 Supply voltage, VCC - V THD -- PO VCC=13V RL=4Ω 2 8 6 ILA06995 Total harmonic distortion, THD - % Total harmonic distortion, THD - % 16 R L= 70 R L =8 18 80 7 5 f=1kHz THD=10% 20 Output power, PO - W Quiescent current, ICCO - mA 90 10 PO -- VCC 22 RL=Open Rg=0 R L =6 ICCO -- VCC 100 7 5 22 24 ILA06996 THD -- PO VCC=13V RL=6Ω 3 2 1.0 7 5 3 2 f=10kHz 0.1 f=1kHz 7 5 3 0.1 f=100Hz 2 3 5 7 1.0 2 3 Output power, PO - W 5 7 2 1.0 ILA06998 No.8178-6/8 LA4632 THD -- PO VCC=13V RL=8Ω 7 5 3 2 1.0 7 5 3 2 f=10kHz 0.1 f=1kHz 7 5 2 3 5 7 2 1.0 3 5 7 Output power, PO - W 7 5 3 2 0.1 7 5 12 10 Output power, PO - W --1 --2 --3 VCC=13V RL=6Ω VO=0dBm Rg=600Ω Cin=4.7µF --4 --5 10 2 3 5 710k 2 3 5 7100k 2 3 5 7 ILA07001 Frequency, f - Hz 70 CH1 2 60 50 40 CH2 1 30 5 7 100 2 3 5 7 1k 2 3 5 710k 5 7 10k 2 3 5 7100k ILA07000 5 7 10k 2 3 THD=10% 8 THD=1% 6 4 5 7100k ILA07003 SVRR -- VCC RL=6Ω fR=100Hz VCCR=0dBm Rg=0 CVCC=1µF 70 CH2 CH1 60 50 40 10 12 14 16 18 Supply voltage, VCC - V 20 22 24 ILA07005 5 7 100 2 3 5 7 1k 2 3 5 7100k ILA07002 VNO -- Rg VCC=13V RL=6Ω BPF=20Hz to 20kHz 0.2 0.1 2 3 5 7 1k 2 3 5 7 10k 2 Signal source resistance, Rg - Ω 3 5 7 100k ILA07004 SVRR -- fR 80 Supply voltage rejection ratio, SVRR - dB 80 2 3 0 100 2 3 Frequency, f - Hz 8 2 3 PO -- f 0.3 Output noise voltage, VNO - mV rms VCC=13V RL=6Ω VO=0dBm Rg=10kΩ 6 5 7 1k Frequency, f - Hz Ch sep -- f 4 2 3 VCC=13V RL=6Ω Rg=600Ω 0 10 2 3 5 7100 2 3 5 7 1k 2 3 5 7 100 2 80 20 10 2 3 Frequency, f - Hz 0 Response - dB 1.0 VCC=13V RL=6Ω PO=1W Rg=600Ω 3 10 2 10 ILA06999 Response -- f 1 Channel separation, Chsep - dB 2 f=100Hz 3 0.1 Supply voltage rejection ratio, SVRR - dB THD -- f 3 Total harmonic distortion, THD - % Total harmonic distortion, THD - % 10 70 CH2 CH1 60 50 40 30 VCC=13V RL=6Ω VCCR=0dBm Rg=0 CVCC=1mF 20 10 2 3 5 7 100 2 3 5 7 1k 2 3 fR -- Hz 5 7 10k 2 3 5 7100k ILA07006 No.8178-7/8 LA4632 SVRR -- VCCR 25 CH2 70 CH1 60 VCC=13V RL=6Ω fR=100Hz Rg=0 CVCC=1µF SVRR=20log (VO / VCCR) 50 40 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VCCR -- Vrms ILA07007 ICC -- PO VCC=13V f=1kHz Rg=600Ω VCC=13V f=1kHz Rg=600Ω Pd=VCC×ICC–2×PO =4 RL 15 Ω 6Ω RL= R L=8Ω 10 5 0 0.1 2 3 5 7 1.0 2 3 5 7 10 Output power, PO - W 2 3 ILA07008 3.0 2.5 8Ω 2.0 R L= Current drain, ICC - A 3.5 2.0 20 Pd -- PO R R L =6 L =4 Ω Ω 4.0 1.8 Power dissipation, Pd - W Supply voltage rejection ratio, SVRR - dB 80 1.5 1.0 0.5 0 0.1 2 3 5 7 1.0 2 3 5 Output power, PO - W 7 10 2 3 ILA07009 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 March, 2005. Specifications and information herein are subject to change without notice. PS No.8178-8/8