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Ordering number : ENN8178
SANYO Semiconductors
DATA SHEET
Monolithic Linear IC
LA4632
Overview
10 W Two-Channel BTL AF Power Amplifier for Audio Applications
The LA4632 is a pin compatible version of the LA4631 (5 W x 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 = 25C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Maximum junction temperature Operating temperature Storage temperature Symbol VCC max IO peak Pd max Tj max Topr Tstg With no input signal Per channel With an infinitely large heat sink Conditions Rated value 24 2.5 25 150 -20 to +75 -40 to +150 Unit V A W C C C
Operating Characteristics at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance range Allowable operating supply voltage range *1 Symbol VCC RL op VCC op When RL = 8 When RL = 6 When RL = 4 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 . Conditions Rated value 13 4 to 8 5.5 to 20 5.5 to 17 5.5 to 13 Unit V V 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
33105TN (OT) No.8178-1/8
LA4632
Operating Characteristics at Ta = 25 C, VCC = 13 V, RL = 6 , f = 1kHz, Rg = 600
Parameter Quiescent current drain Standby current Voltage gain Total harmonic distortion Output power Output offset voltage Output noise voltage Supply voltage rejection ratio Channel separation Input resistance Standby pin applied voltage Mute pin applied voltage Muting attenuation Symbol ICCO Ist VG THD PO VN offset VNO SVRR CH sep Ri VST VM ATTM The pin 5 voltage such that the amplifier is on The pin 6 voltage such that muting is applied VO = 1 Vrms, BPF = 20 Hz to 20 kHz VO= 0 dBm PO = 1 W THD = 10 % Rg = 0 Rg = 0, BPF = 20 Hz to 20 kHz Rg = 0, fR = 100Hz, VR = 0 dBm Rg = 10 k, VO = 0 dBm 50 50 14 2.5 1.7 80 90 8.5 -300 0.14 60 60 20 26 10 3 33 Rg = 0, no signal Conditions Ratings min 40 typ 70 0 35 0.06 10 +300 0.3 max 150 10 37 0.2 Unit mA A dB % W mV mVrms dB dB k V V dB
Package Dimensions
unit : mm 3049B
26.8 (20.0)
4.0
7.0
1.0min
1
(2.4) 2.0 0.5 1.0
12
0.4 2.0
SANYO : SIP12H
Pd max -- Ta
30
Allowable power dissipation, Pd max - W
25
f=3C/W
With an infinitely large heat sink
Aluminum heat sink, t = 1.5 mm Tightening torque: 39 N cm With silicone grease applied
20.8 f=4C/W 20
15 13.9 f=7C/W 10.4 f=10C/W 10
jc=2C/W
5
3.1
No radiator fin
0 --20
0
20
40
60
80
100
120
6.0
140 160 ILA06994
Ambient temperature, Ta - C
13.2max
(8.4)
(R1.7)
(11.8)
No.8178-2/8
LA4632
Block Diagram
5 STAND BY SIGNAL MUTE 6 CH1 +OUT1 12 IN1 2 + Output amplifier - Input amplifier 11 -OUT1 7 VCC
PRE GND
3
Protection circuits Protection against shorting to the power supply, shorting to ground, load shorting, and excessive temperatures
10
PWR GND
Input amplifier IN2 4 + Output amplifier -
8 +OUT2
9 -OUT2 CH2
Ripple filter/startup timer 1
No.8178-3/8
LA4632
Application Circuit Example/Test Circuit Diagram
LA4632
PRE GND 3 C2 4.7F 16V PWR GND 10
RF 1 C1 4.7F 16V C3 47F 25V
IN1 2
IN2 4
STBY 5 R1 15k
MUTE 6 C4 10F 10V
VCC 7
+OUT2 8
--OUT2 9
--OUT1 11 RL
+OUT1 12
RL C8 0.1F C9 0.1F
+
+
+
+
C6 0.1F
STBY 5V
R4 2.2
R5 2.2
R2 2.2
C5 1000F 25V
+
Mute 5V
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 F 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 F 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 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 F, 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 F 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 F, 15 k) 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 F capacitor also has the function of smoothing after the startup time, it is required even if the signal muting function is not used.
R3 2.2
C7 0.1F
No.8178-4/8
LA4632
Pin 6 IC internal equivalent circuit Imute 6 20k 10F 2k
15k +5V Mute pin applied voltage
2k
Other items Standby function
Pin 5 IC internal equivalent circuit Use ISTB = up to 500A as an initial target. 2VBE RSTB 5 30k 1.5k 15k
When an voltage of +5 V is applied to the mute pin through the external 15 k 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 A. 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 A. 5 V - 2 VBE (about 1.55 V) ISTB = = 230 A 15 k
Standby pin applied voltage
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 A as the initial target value). RSTB = 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.) Applied voltage - 2VBE (about 1.55 V) ISTB (Under 500 A) - 15 k
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 160C 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.
100 90
ICCO -- VCC
RL=Open Rg=0 Output power, PO - W
22 20 18 16
PO -- VCC
R L =6
10 12
f=1kHz THD=10%
Quiescent current, ICCO - mA
70 60 50 40 30 20 10 0 2 4 6 8 10 12 14 16 18 20 22 24
12 10 8 6 4 2 0 4 6 8
R L=
14
4
14
16
18
R L =8
20 22
80
24
Supply voltage, VCC - V
10
ILA06995 10
THD -- PO
Supply voltage, VCC - V
ILA06996
THD -- PO
Total harmonic distortion, THD - %
3 2 1.0 7 5 3 2 0.1 7 5 3 0.1 2 3 5
Total harmonic distortion, THD - %
7 5
VCC=13V RL=4
7 5 3 2 1.0 7 5 3 2 0.1 7 5
VCC=13V RL=6
f=10kHz
f=10kHz
f=1kHz f=100Hz
7 1.0 2 3 5 7 10 2 3
f=1kHz
f=100Hz
2 3 5 7 1.0 2 3 5 7
3 0.1
Output power, PO - W
ILA06997
Output power, PO - W
2 1.0 ILA06998
No.8178-6/8
LA4632
10
THD -- PO
Total harmonic distortion, THD - % VCC=13V RL=8
3 2
THD -- f
VCC=13V RL=6 PO=1W Rg=600
Total harmonic distortion, THD - %
7 5 3 2 1.0 7 5 3 2 0.1 7 5
1.0 7 5 3 2
f=10kHz
0.1 7 5 3 10
f=1kHz
f=100Hz
2 3 5 7 1.0 2 3 5 7
3 0.1
Output power, PO - W
1
2 10 ILA06999
23
5 7 100
23
5 7 1k
23
5 7 10k
23
Frequency, f - Hz
12
5 7100k ILA07000
Response -- f
PO -- f
VCC=13V RL=6 Rg=600 THD=10%
0
10
Output power, PO - W
Response - dB
--1
8
THD=1%
--2
6
--3
4
--4
--5 10
VCC=13V RL=6 VO=0dBm Rg=600 Cin=4.7F
2 3 5 7100 2 3 5 7 1k 2 3 5 710k 2 3 5 7 100k 2 3 5 7 ILA07001 Frequency, f - Hz
2
0 10
23
5 7 100
23
5 7 1k
23
5 7 10k
23
Frequency, f - Hz
0.3
5 7100k ILA07002
80
Ch sep -- f
Output noise voltage, VNO - mV rms VCC=13V RL=6 VO=0dBm Rg=10k CH1 2
VNO -- Rg
VCC=13V RL=6 BPF=20Hz to 20kHz
Channel separation, Chsep - dB
70
60
0.2
50
40
0.1
CH2 1
30
20 10
23
5 7 100
23
5 7 1k
23
5 710k
23
Frequency, f - Hz
80
5 7100k ILA07003
0 100
2
3
Signal source resistance, Rg -
5 7 1k
2
3
5 7 10k
2
3
5 7 100k ILA07004
SVRR -- VCC
Supply voltage rejection ratio, SVRR - dB RL=6 fR=100Hz VCCR=0dBm Rg=0 CVCC=1F
80
SVRR -- fR
Supply voltage rejection ratio, SVRR - dB
70
70
CH2
60
CH2 CH1
60
CH1
50
40
50
30
40 4 6 8 10 12 14 16 18 20 22 24
20 10
VCC=13V RL=6 VCCR=0dBm Rg=0 CVCC=1mF
23 5 7 100 23 5 7 1k 23 5 7 10k 23
Supply voltage, VCC - V
ILA07005
fR -- Hz
57 100k ILA07006
No.8178-7/8
LA4632
80
SVRR -- VCCR
25
Pd -- PO
VCC=13V f=1kHz Rg=600 Pd=VCCxICC-2xPO
Supply voltage rejection ratio, SVRR - dB
70
CH2
Power dissipation, Pd - W
20
CH1
60
=4 RL
15
6 RL=
50
40 0 0.2 0.4 0.6 0.8
VCC=13V RL=6 fR=100Hz Rg=0 CVCC=1F SVRR=20log (VO / VCCR)
1.0 1.2 1.4 1.6 1.8 2.0
10
R L=8
5
0 0.1
2
3
5
7
1.0
2
3
5
7
10
2
3
VCCR -- Vrms
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0.1
ILA07007
ICC -- PO
Output power, PO - W
ILA07008
Current drain, ICC - A
2
3
5
7
1.0
2
3
5
R L=
7
8
2
R R L =6 L =4
VCC=13V f=1kHz Rg=600
10
3
Output power, PO - W
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

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