一 224 一
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三三字羊
根辑
音频功牟放大器
RL斗.....80 (2迢迢)
极限参数( TA=25"C)
电源也压
VCC~二 llV (有信号)
VCC~二 15V (元信号)
2. 捆， 2 通过
RL=80 (BTL)
功耗
PD~4.0W
(带 P 板)
坏 1患温度
T A=-20......75 C
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VCC=9.0V
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•
VCC=9.0V , R L=4.00 (2 通过)
RL=8.00 (BTL)
Rg=6000 , f =l.OkHz
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RL=8.00
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0
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LA4192
Ordering number:ENN919D
Monolithic Linear IC
LA4192
1 to 2.3W 2-Channel of Power Amplifier
Features
Package Dimensions
• Has two channels that can be used for either stereo or
bridge amplifier.
• High outputs : LA4192 provides 2.3W per channel for 2
channel stereo connected at V CC =9V,
R L=4Ω, or 4.7W bridge amplifier (for
RL=8Ω).
• Voltage gain is variable by externally connected feedback
resistors :
For 2-channel :
RNF=27Ω, VG=50dB
Bridge amplifier connected : RNF=51Ω, VG=51dB
• Switching distortions in higher frequencies have been held
low.
• The built-in muting circuit keeps noises caused by turning power on and off at low levels.
• The built-in ripple filter provides good ripple rejection
factors.
• Excels in channel separation.
unit:mm
3022A-DIP12F
[LA4192]
12
0.4
7.62
6.45
7
1
5.12
6
0.81
0.5
2.54
3.6
3.46
4.26max
0.51min
3.5
19.4
1.3
SANYO : DIP12F
Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Symbol
VCC max
Allowable power dissipation
Pd max
Conditions
Ratings
Unit
With signals
11
With no signal
15
V
4
W
With P-plate (See Pd – Ta diagram)
V
Operating temperature
Topr
–20 to +75
˚C
Storage temperature
Tstg
–55 to +150
˚C
Recommended Operating Conditions at Ta = 25˚C
Parameter
Supply voltage
Symbol
Conditions
Ratings
Unit
VCC
Load resistance
RL
2-channel
9
V
4 to 8
Ω
8
Ω
Bridge
Note : Basically, this package dissipates heat by using the copper foil section of the printed circuit board, but because power dissipation Pd can be
increased by power voltages and load conditions, it is recommended that a heat sink be used in conjunction with the printed circuit board.
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
21500TH (KT)/71093TS/O207KI/2146KI/4195MW, TS No.919–1/11
LA4192
Operating Characteristics at Ta = 25˚C, VCC=9V, f=1kHz, Rg=600Ω, RL=4Ω, ( ) denotes values for 8Ω, in the
specified test circuit
Parameter
Quiescent current
Voltage gain
Voltage gain imbalance
Symbol
ICCO
VG
∆VG
Conditions
Total harmonic distortion
Input resistance
Output noise voltage
Ripple rejection
Channel separation
PO
THD
35
For 2 channels 7.5V
40
Rr
CH sep
Unit
max
55
mA
mA
Closed loop, RNF=27Ω, VIN=–51dBm, 2-channel
48
50
52
dB
Closed loop, RNF=27Ω, VIN=–51dBm, Bridge
49
51
53
dB
2
dB
2-channel
1.7
2.3
THD=10%, 2-channel
(1.3)
THD=10%, Bridge
(4.7)
PO=250mW, 2-channel
ri
VNO
typ
For 2 channels 6V
THD=10%, 2-channel
Output power
Ratings
min
0.5
21
W
W
2.0
30
%
kΩ
Rg=0, 2-channel
0.5
1.3
mV
Rg=10kΩ, 2-channel
0.8
2.5
mV
Rg=0, VR=150mV, 2-channel
46
dB
55
dB
Rg=10kW, vo=0dBm, 2-channel
40
Equivalent Circuit Block Diagram
No.919–2/11
LA4192
Sample Application Circuit 1 : For 2-channel
Sample Application Circuit 2 : Bridge amplifier connected
No.919–3/11
LA4192
Externally connected components and comments
C1 (C2) : Feedback capacitor : The lower cut-off frequency is given by the following formula :
1
fL : Lower cut-off frequency
fL=
2πC1Rf
Rf : Feedback resistance
This requires careful review, because, together with decoupling capacitor, it affects the starting time.
R1 (R2) : Feedback resistor : Voltage gain is determined by ratio to the built-in resistor. Use ±5%-tolerance resistors to
enhance balance of voltage gains for the two channels.
C3 (C4) : Bootstrap capacitor : Capacitance affects output in the low-frequency range ; employment of small-value
capacitance causes reduced outputs in lower frequencies. Employ at least 47µF.
C5 (C6) : De-oscillating capacitor : Use a mylar capacitor that excels in temperature and frequency characteristics. If an
aluminum electrolytic or a ceramic capacitor is used, it may cause oscillation.
C7 (C8) : Output capacitor : The lower cut-off frequency is given by the following formula :
fL : Lower cut-off frequency
1
fL=
RL : Load resistance
2πC7R
L
C9 :
C10 :
To obtain equivalent low-frequency characteristics for 2-channel operation with bridge amplifier connected,
double the capacitance.
Decoupling capacitor : Though this is an arm of the ripple filter, rejection effects saturate at a certain value so
that excessively large values do not serve any further purpose. It is employed for a time constant of the muting
circuit, so it affects the starting time.
Power supply capacitor.
Concerning application circuits
1. Voltage gain adjustments
♦ 2-channel
Voltage gain is determined by resistor R1 (R2) and an
externally connected feedback resistor Rf in accordance
with the following formula :
VG=20 log
R1 (R2)
[dB]
Rf
By suitable selection of the externally connected resistor Rf, any voltage gain can be obtained. It is preferable, however, that the voltage gain is chosen in the
range of 45dB to 50dB. Incidentally, R1 (R2) =10kΩ
typ.
♦ Bridge Amplifier.
A bridge amplifier connection is structured as shown above. Ch-1 functions as a non-inverting amplifier and Ch-2
as an inverting amplifier. For input to ch-2, output of ch-1 is divided by resistors R3 and R4 and is led out at pin 1
as bridge amplifier output. Attenuation of ch-1 output is R3/R4, while amplification of ch-2/ (RNF+R4), and due to
designation for R3 : 5kΩ typ., and R4 : 50Ω typ., ch-1 output attenuation and ch-2 amplification become equal by
designating RNF=51Ω. When obtained at ch-2, output is the same output as ch-1 but opposite in phase. Accordingly, the overall voltage gain exhibited is 6dB above ch-1 gain, and is approximately given by the following
formula.
Continued on next page.
No.919–4/11
LA4192
Continued from preceding page.
VG=20 log
R1
+6 [dB]
Rf
If designated for Rf=27Ω, VG=56dB will be obtained which is excessive ; it is recommended that RNF=51Ω be
designated when bridge amplifier is connected.
2. Crosstalk
As LA4192 is used at a voltage gain around 50dB, feedback is shallow. It is recommended that the bridge amplifier
output pin (pin 1) be grounded when used for 2-channel.
3. Starting time
A built-in muting circuit suppresses shock noise when power is turned on. It utilizes time constant of C9 (decoupling capacitor), and built-in charging circuits for C1 and C2 (NF capacitors). The starting time depends on
capacitances of C1 (C2) and C9 as shown below :
4. Cautions for use of the IC
1. When used close to the maximum ratings, even a slight variation in conditions can cause the maximum ratings to
be surpassed. This leads to breakdown failures. Be sure to provide for sufficient margins to cover variations in
power voltages. Use the IC in a range that never exceeds the maximum ratings.
2. Inter-pin shortcircuits
Turning the power on with inter-pin shortcircuits causes breakage or deterioration, so that when mounting the IC
on a circuit board, carefully inspect to avoid inter-pin shorts caused by soldering, before turning the power on.
3. Short-circuited loads
When used for a prolonged period with a shorted load, breakage or deterioration can result. Under no circumstance should loads be left shorted.
4. When used in a radio or radio-cassette recorder, maintain a sufficient distance between the IC and a bar antenna.
5. In making a circuit board, refer to the sample printed pattern.
No.919–5/11
LA4192
• Caution for LA4192 in sets
When LA4192 is used in a set and driven by AC mains, switching the motor on as shwon below, causes instantaneous
lowering of the power supply voltage, depending on the transformer regulation and other conditions.
Ripple noises are sometimes generated in the speakers or headphones. The following can be used to prevent such problems.
1. Connect a diode (a rectifier diode with an average
rectified current IO=100 to 200mA) across pins 6
and 12 of LA4192, and have pin 6 potential closely
follow power supply voltage variations. In a steady
state, this diode will be cut off.
2. Use large enough capacitance capacitors for the
power supply to suppress supply votage variations
caused when the motor is switched on.
• Heat sink design
As the package is basically heat-dissipated by utilizing a copper foil section of the printed circuit board, the area of
copper foil in the vicinity of the IC heat dissipating plate should be made as broad in area as possible when designing the
printed circuit board. For the sample printed pattern shown earlier, providing copper coil where indicated by the broken
lines will considerably enhance heat sinking. Power consumption (Pd) can be increased depending on power supply
voltage and load conditions. Use of a heat sink in conjunction with the printed circuit board is recommended. Described
below are formulas to provide guidelines for Pd (for 2 channels) under various conditions of usage. For AC power
supplies, it is preferable to take actual measurements at the transformer of sets. For bridge amplifier, simply use 1/2 of
employed loads in computations.
1) DC power supply
Pd max=
VCC2
+ICCO · VCC (for 2 channels) .............................................. (1)
π2RL
2) AC power supply
VCC2 :
VCC (Pd) :
VCC1 :
Power supply voltage at no signal
Power supply voltage at Pd max
Power supply voltage at maximum output
r:
Voltage regulation
ICCO :
Quiescent current
VCC2–VCC1
VCC1
Power supply voltage variation
Pd max=
VCC(Pd)2
+ICCO · VCC (Pd) (for 2 channels) ............................... (2)
π2RL
where
(1+r) VCC1
VCC (Pd)=
1+
√
r · VCC1
RL
×
√2 · π · RL
PO max
Sample heat sink mounting
Prepare a heat sink as shown on the next page. It is configured to be able to dissipate heat both from the IC plastic surface
and its fins. Solder it on to the printed circuit board. Refer to the Pd – Ta characteristics for size of heat sink. Solderable
copper or steel are preferable. Silicone grease is recommended for application to the IC plastic surface to lower its
thermal resistance with the heat sink.
No.919–6/11
LA4192
No.919–7/11
LA4192
No.919–8/11
LA4192
No.919–9/11
LA4192
No.919–10/11
LA4192
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.919–11/11