LA4725_09 [SANYO]
2-channel 30W BTL Audio Power Amplifier; 2声道30W BTL音频功率放大器
| 型号： | LA4725_09 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | 2-channel 30W BTL Audio Power Amplifier |
| 文件： | 总8页 (文件大小：126K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : EN5715A
Monolithic Linear IC
2-channel 30W BTL Audio Power
Amplifier
LA4725
Overview
The LA4725 is a 2-channel BTL audio power amplifier IC for Car audio. It was designed for the best possible audio quality
and features an extended low band roll-off frequency provided by a newly-developed NF circuit that does not require an
external capacitor. Furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced
by both circuit and wiring pattern improvements. Thus this amplifier can provide powerful lows and clear highs.
Features
• Total output (EIAJ power): 30W+30W (at V
= 14.4V, R = 4Ω, THD = 30%)
L
CC
• High-fidelity design (f < 10Hz, f = 130kHz)
L
H
• Extremely low impulse noise levels
• An arbitrary amplifier startup time can be set up with external components
• built-in standby switch circuit
• Full complement of built-in protection circuits (includes circuits that protect against shorting to V , shorting to ground,
CC
load shorting, over-voltages and excessive temperatures)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Surge supply voltage
Symbol
max
Conditions
Ratings
Unit
V
V
V
I
No signal
18
50
CC
surge
t ≤ 0.2s, Giant pulse one-shot
Per channel
V
CC
peak
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
3.0
A
O
Pd max
Topr
With a infinite heat sink
32
W
°C
°C
-35 to +85
-40 to +150
Tstg
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. 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.
40109 MS JK 20090313-S00003 No.5715-1/8
LA4725
Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Recommended supply voltage
Allowable operating supply voltage
Recommended load resistance
V
V
13.2
9 to 16
4
CC
op
V
CC
R
Ω
L
Note : With V , R , and the output level in ranges such that the Pd max for the heat sink used is not exceeded.
CC
L
Electrical Characteristics at Ta = 25°C, V
CC
= 13.2V, R = 4Ω, f = 1kHz, Rg = 600Ω
L
Ratings
typ
Parameter
Symbol
Conditions
min
Unit
max
250
60
Quiescent current
I
I
Rg = 0
70
125
mA
µA
CCO
st
Standby mode current drain
Standby mode (amplifier off), with no power
supply capacitor.
10
Voltage gain
V
V
= 0dBm
= 2W
38
13
40
0.06
17
42
dB
%
G
O
O
Total harmonic distortion
Output power
THD
P
0.2
P
P
P
V
V
1
2
3
THD = 10%
THD = 10%, V
THD = 30%, V
Rg = 0
W
O
O
O
N
= 14.4V
= 14.4V
20
W
CC
CC
30
W
Output offset voltage
Output noise voltage
Ripple rejection ratio
Channel separation
Input resistance
offset
-300
+300
0.5
mV
mV
dB
dB
kΩ
V
Rg = 0, BPF = 20Hz to 20kHz
Rg = 0, V = 0dBm, f = 100Hz
0.1
50
60
30
NO
SVRR
CHsep
Ri
40
50
R
R
Rg = 10kΩ, V = 0dBm
O
21
39
Standby pin applied voltage
V
Amplifier on
2.5
V
ST
CC
(applied through an external 10kΩ resistor)
Package Dimensions
unit : mm (typ)
3113B
Pd max -- Ta
35
Infinite heat sink
AI heat sink Mounting
torque 39N•cm
32.5
30
26.8
HEAT SPREADER
4.0
Flat washer Silicone
grease applied
(20.0)
θf = 3°C/W
θf = 4°C/W
(R1.7)
25
20.83
20
θjc = 2°C/W
15
θf = 7°C/W
13.9
θf = 10°C/W
10.4
10
5
3.1
1
14
Νο Fin
(1.83)
0.4
1.6
1.78
0.5
0.8
0
-40
-20
0
20
40
60
80
100 120 140 160
2.2
Ambient temperature, Ta -- °C
SANYO : SIP14HZ
No.5715-2/8
LA4725
Block Diagram
C2
100µF/25V
V
CC
+
+
C5
2
14
OUTPUT PIN TO V
SHORT PROTECTOR
CC
RIPPLE
FILTER
ñ
+
-OUT1
C6**
PREDRIVER
PREDRIVER
POWER
POWER
13
12
11
C1
+
1
+
R
R2
R3
POWER
GND1
LOAD SHORT
PROTECTOR
L
IN
−
2.2µF
25V
4Ω
C7**
+OUT1
OUTPUT PIN TO GND
SHORT PROTECTOR
PRE GND
OVER VOLTAGE /
SURGE PROTECTOR
BIAS
CIRCUIT
3
**
(POLYESTER FILM
CAPACITOR)
V
CC
R1
10KΩ
ON
STANDBY
SW
THERMAL
SHUT DOWN
4
OUTPUT PIN TO GND
SHORT PROTECTOR
OFF
+5V
ñ
+
-OUT2
C8**
PREDRIVER
PREDRIVER
POWER
9
10
8
IN2
C4
+
+
6
R4
R5
R
L
4Ω
LOAD SHORT
PROTECTOR
POWER
GND2
IN
−
2.2µF
25V
C9**
POWER
+OUT2
OUTPUT PIN TO V
CC
SHORT PROTECTOR
POP NOISE
PREVENTION
CIRCUIT
5
7
+
+
C3
C10
C3
C10
Impulse noise reduction
(Note : The device’s ability to withstand shorting
to V or shorting to ground when V is
Sets the amplifier starting time
(Approximately 0.6 seconds when 33µF)
CC CC
around 16V may be reduced as the value of this
capacitor is increased. We recommend 0.47µF.)
No.5715-3/8
LA4725
Pin Voltages
V
= 13.2V, with 5V applied to STBY through a 10kΩ resistor, R = 4Ω, Rg = 0
CC
L
Pin No.
1
2
3
PRE-GND
0V
4
5
6
7
Pin name
IN1
DC
STBY
3.25V
ON TIME
2.32V
IN2
POP
2.14V
Pin voltage
1.53V
5.65V
1.53V
Pin No.
Pin name
Pin voltage
8
9
10
PWR-GN
0V
11
12
PWR-GN
0V
13
14
+OUT2
5.70V
−OUT2
5.70V
+OUT1
5.70V
−OUT1
5.70V
V
CC
13.2V
External Components
C1 and C4: Input capacitors. A value of 2.2µF is recommended. Determine the polarity based on the DC potential of
the circuit connected directly to the LA4725 front end. Note that the low band response can be adjusted by
varying f with the capacitors C1 and C4.
L
C2
C3
: Decoupling capacitor (ripple filter)
: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33µF. The starting
time is proportional to the value of this capacitor, and can be set to any desired value.
: Power-supply capacitor
C5
C6, C7, C8, and C9 :
Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent
characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these
capacitors to achieve stable amplifier operation.) A value of 0.1µF is recommended.
C10
R1
: Impulse noise reduction capacitor. A value of 0.47µF is recommended. Caution is required when selecting
the value for this capacitor, since increasing its value influences the operation of the circuits that protect
against shorting the amplifier output pins to V
16V or higher) are used.
or to ground when higher V voltages (approximately
CC
CC
: Standby switch current limiting resistor. A value of 10kΩ is recommended when a voltage in the range 2.5 to
12V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be included.
IC Internal Characteristics and Notes
1. Standby function
Pin 4 Internal Equivalent Circuit
• Pin 4 is the standby switch. A voltage of 2.5V or
higher must be applied through an external resistor to
turn the amplifier on.
• If a voltage of over 12V will be applied as the
standby mode switching voltage, use the following
formula to determine the value of R1 so that the
current entering at pin 4 remains under 500µA.
500µA or lower
10kΩ
4
R1
About 1.4V
(2V
Applied standby
voltage
)
BE
<applied voltage> − 1.4
R1 =
− 10kΩ
500µA
2. Muting function
• Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute
the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.
3. Impulse noise improvements
• While the LA4725 achieves a low level of impulse noise, if even further reductions in impulse noise at power
on/off (and when switching into or out of standby mode) a 0.47µF capacitor may be inserted between pin 7 and the
PRE GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins
to V
or ground is reduced for supply voltages over 16V if the pin 7 capacitance is large, we recommend a value
CC
of 0.47µF or lower for this capacitor.)
No.6631-4/8
LA4725
4. Protection circuits
• Due to the system structure of the protection circuit for shorts to V
or ground, if there is a DC resistance
CC
between the amplifier output pins and ground, the protection circuit may operate when power is first applied and
the amplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which
there is a DC resistance between the amplifier outputs and ground.
• The LA4725 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if
abnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC
junction temperature (Tj) reaches the range 170 to 180°C due to inadequate heat sinking or other problem. If the
temperature falls, the amplifier will restart automatically.
• The LA4725 also includes other protection circuits. Use of these circuits also requires care during end product
design and testing.
5. Other notes
• The LA4725 is a BTL power amplifier. When testing this device, the ground systems for the test equipment
connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a
common ground.
Printed Circuit Pattern
(copper foil side)
GND
C5
+
14
1
+
LA4625/LA4725
V
CC
C1
IN1
+
C2
-OUT1
+OUT1
R2
C6
C7
STB
GND
R1
C3
+
+
IN2
R3
C4
+
C10
-OUT2
+OUT2
R4
R5
C8
C9
GND
No.6631-5/8
LA4725
P
-- V
CC
P
O
-- V
IN
O
100
40
35
30
25
20
15
10
5
7
f = 1kHz
V
= 13.2V
CC
= 4Ω
5
3
2
Rg = 600Ω
R
L
R
= 4Ω
f = 1kHz
L
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0
0.01
1.0
2
3
5
7
2
3
5
7
2
3
5
7
1k
6
7
8
9
10
11 12 13 14 15 16 17 18
10
100
Input voltage, V -- mVrms
IN
Supply voltage, V
-- V
CC
f Response
P
-- f
O
2
0
24
20
16
12
8
V
= 13.2V
CC
R
= 4Ω
L
Rg = 600Ω
THD = 10%
THD = 3%
-2
-4
THD = 1%
-6
V
= 13.2V
CC
= 4Ω
-8
4
R
L
Rg = 600Ω
V
= 0dBm (f = 1kHz)
O
-10
10
0
10
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5 7
100k
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5 7
100k
100
1k
10k
100
1k
10k
Frequency, f -- Hz
Frequency, f -- Hz
THD -- P
THD -- f
O
10
7
5
10
7
5
V
= 13.2V
V
R
= 13.2V
CC
CC
R
= 4Ω
= 4Ω
L
L
Rg = 600Ω
P
= 1W
O
3
2
3
2
DIN AUDIO
Nonfilter
1.0
1.0
7
5
7
5
3
2
3
2
f = 1kHz
100Hz
0.1
7
5
0.1
7
5
10kHz
3
2
3
2
0.01
10
0.01
2
3
5
7
2
3
5
7
2
3
5
7
2 3 5 7
100k
2
3
5
7
2
3
5
7
2
3
5 7
100
100
1k
10k
0.1
1.0
10
Output power, P -- W
O
Frequency, f -- Hz
V
--V
CC
CHsep -- f
NO
120
110
-20
-30
-40
-50
-60
-70
-80
Rg = 0
= 4Ω
V
R
= 13.2V
CC
R
= 4Ω
L
L
Rg = 10kΩ
V
= 0dBm
O
Nonfilter
100
90
CH1→2
CH2→1
80
70
60
8
10
12
14
16
18
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5 7
100k
10
100
1k
10k
Supply voltage, V
CC
-- V
Frequency, f -- Hz
No.6631-6/8
LA4725
SVRR -- V
SVRR -- V
CC
CCR
-20
-30
0
-20
R
= 4Ω
V
= 13.2V
L
CC
Rg = 0
= 100Hz
R
= 4Ω
L
f
Rg = 0
R
V
= 0dBm
Nonfilter
CCR
DIN AUDIO
-40
-50
-40
OUT1
-60
-60
-70
-80
OUT2
-80
V
O
SVRR = 20log
V
CCR
-100
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
6
8
10
12
14
16
18
Power supply ripple, V
-- Vrms
Supply voltage, V
-- V
-- V CCR
CC
SVRR -- fCC
R
I
CCO
0
-20
160
140
120
100
80
V
R
= 13.2V
R
= 4Ω
CC
L
= 4Ω
Rg = 0
L
Rg = 0
V
= 0dBm
CCR
Nonfilter
-40
-60
-80
60
-100
40
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5 7
100k
6
8
10
12 14 16 18 20 22 36 36 36 36
10
100
1k
10k
Ripple frequency, f -- Hz
Supply voltage, V
CC
-- V
R
V
-- V
Pd -- P
N
CC
O
12
10
8
25
20
15
10
5
R
= 4Ω
R
= 4Ω
L
L
Rg = 600Ω
Rg = 0
f = 1kHz
6
4
2
0
0
0.1
2
3
5
7
2
3
5
7
2
3
5
7
100
5
10
15
20
25
30
1.0
10
Supply voltage, V
CC
-- V
Output power, P -- W
O
Amp ON time
0.6
0.5
0.4
0.3
0.2
0.1
0
V
V
= 13.2V
= 5V
CC
ST
2
3
5
7
2
3
5
7
1.0
10
100
C3 -- µF
No.6631-7/8
LA4725
SANYO Semiconductor Co.,Ltd. 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 Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents 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 Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require 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 consent of SANYO Semiconductor 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 Semiconductor Co.,Ltd. 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.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of April, 2009. Specifications and information herein are subject to change
without notice.
PS No.5715-8/8
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