LA4708N [SANYO]
Monolithic Linear IC For Car Stereos 20W 2-channel BTL AF Power Amplifier; 单片线性IC，用于汽车音响20W双声道BTL AF功率放大器
| 型号： | LA4708N |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Monolithic Linear IC For Car Stereos 20W 2-channel BTL AF Power Amplifier |
| 文件： | 总9页 (文件大小：203K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA1783
Monolithic Linear IC
For Car Stereos
LA4708N
20W 2-channel BTL AF Power
Amplifier
Overview
The LA4708N is a BTL two-channel power IC for car audio developed in pursuit of excellent sound quality. Low-region
frequency characteristics have been improved through the use of a new NF capacitor-less circuit, and crosstalk which
causes “muddy” sound has been reduced by improving both circuit and pattern layout. As a result, the LA4708N provides
powerful bass and clear treble. In addition, the LA4708N features on-chip protectors and standby switch.
Features
• High power : supports total output of 30W + 30W (V
= 13.2V, THD = 30%, R = 4Ω)
L
CC
= 13.2V, THD = 10%)
• Supports R = 2Ω (P = 30W when V
L
O
CC
• Designed for excellent sound quality (f < 10Hz, f = 130kHz)
L
H
• NF capacitor-less
• Any on time settable by external capacitor
• Less pop noise
• Standby switch circuit on chip (microprocessor supported)
• Various protectors on chip (output-to-ground short/output-to-V
short/load short/overvoltage/thermal shutdown circuit)
CC
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.
61610 SY 20100405-S0010 No.A1783-1/9
LA4708N
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum supply voltage
V
V
max 1
No signal, t = 60s
24
16
CC
CC
CC
max 2
surge
V
Surge supply voltage
V
I
t ≤ 0.2s, single giant pulse
Per channel
50
4.5
V
A
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
peak
O
Pd max
Topr
Arbitrarily large heat sink
37.5
W
°C
°C
−35 to +85
−40 to +150
Tstg
* Set V , R in a range that does not exceed Pd max = 37.5W
CC
L
Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Recommended supply voltage
Operating voltage range
V
V
13.2
9 to 16
4
CC
op
Range where Pd max is not exceeded
V
CC
Recommended load resistance
Recommended load resistance range
R
Ω
L
L
R
op
2 to 4
Ω
Electrical Characteristics at Ta = 25°C, V
= 13.2V, R = 4Ω, f = 1kHz, Rg = 600Ω
L
CC
min
typ
max
250
60
Parameter
Symbol
Conditions
Unit
mA
μA
I
70
38
16
150
10
Quiescent current
CCO
Standby current
Voltage gain
lst
VG
THD
40
42
dB
P
= 2W
0.07
20
0.4
%
Total harmonic distortion
Output power
O
P
P
P
V
V
1
2
3
THD = 10%
W
O
O
O
N
THD = 10%, V
= 14.4V
CC
24
W
THD = 10%, R = 2Ω
30
W
L
Output offset voltage
Output noise voltage
Ripple rejection ratio
Channel separation
Input resistance
offset
Rg = 0
−300
+300
mV
mVrms
Rg = 0, B.P.F. = 20Hz to 20kHz
Rg = 0, f = 100Hz, V = 0dBm
0.1
0.5
NO
SVRR
CHsep
40
50
50
60
30
dB
dB
kΩ
R
R
Rg = 10kΩ, V = 0dBm
O
21
39
r
i
Amp on, applied through 10kΩ
2.5
Standby pin applied voltaga
Vst
V
V
CC
Package Dimensions
unit : mm (typ)
3109A
36.8
(30.0)
(R1.7)
HEAT SPREADER
4.5
1
18
(1.4)
2.25
2.0
0.5
1.0
0.4
SANYO : SIP18H
No. A1783-2/9
LA4708N
Pd max -- Ta
Arbitrarily large heat sink
θ -- S
f
f
40
35
3
2
AI heat sink, t = 1.5mm
Tightening torque 39N cm
With silicone grease applied
θ
f
= 1.5°C/W
2.0°C/W
θ
jc
= 2.0°C/W
30
25
20
10
3.2°C/W
4.1°C/W
7
5
15
10
7.0°C/W
3
2
5
No Fin
3.5
0
-20
0
20
40
60
80
100
120
140
160
2
3
5
7
2
3
5
7
1000
100
Heat sink area, S -- cm2
Ambient temperature, Ta -- °C
JK470801
f
JK470802
Block Diagram
100μF/ 16V
V
CC
+
+
C2
3
V
18
1
CC
2200μF
C5
1
OUTPUT PIN-TO-V
CC
SHORT PROTECTOR
RIPPLE
FILTER
INVERTING
OUT1
POWER
PREDRIVER
17
16
0.1μF
C6
2.2Ω
∗∗
C1
IN1
+
R2
-
+
POWER
GND1
2
R
L
2 to 4Ω
LOAD SHORT
PROTECTOR
IN
-
R3 2.2Ω
2.2μF/ 6.3V
+
0.1μF
∗∗
C7
PREDRIVER
POWER
15
NONINVERTING
OUT1
PRE GND
R1
OUTPUT PIN-TO-GND
SHORT PROTECTOR
4
BIAS
CIRCUIT
OVERVOLTAGE/
SURGE PROTECTOR
V
CC
∗∗
POLYESTER FILM
CAPACITOR
OUTPUT PIN-TO-GND
SHORT PROTECTOR
10kΩ
OFF ON
THERMAL
SHUTDOWN
STANDBY
SW
5
+5V
NONINVERTING
OUT2
PREDRIVER
POWER
14
13
12
C4
0.1μF
∗∗
IN2
C8
+
+
+
-
7
2.2Ω
LOAD SHORT
PROTECTOR
R4
R
L
2 to 4Ω
IN
POWER
GND2
2.2μF/ 6.3V
-
2.2Ω
R5
0.1μF
∗∗
C9
PREDRIVER
POWER
INVERTING
OUT2
POP NOISE
PREVENTION
CIRCUIT
OUTPUT PIN-TO-V
CC
SHORT PROTECTOR
6
+
8
9
10
11
V
2
CC
33μF/ 6.3V
N.C
C3
Pins 1,9 : Don't use.
Pin 10 : No connection.
Each Pin Voltage
V
= 13.2V, 5V applied through STBY = 10kΩ, R = 4Ω, Rg = 0
L
CC
Pin No.
1
2
3
4
Pre-GND
0
5
6
Name
IN1
1.58
DC
6.55
STBY
3.2
ON TIME
2.28
Pin voltage (V)
0.29
Pin No.
Name
7
8
9
-
10
N.C
0
11
12
−OUT 2
6.5
V
2
IN2
1.58
POP
2.08
CC
Pin voltage (V)
0.29
13.2
Pin No.
Name
13
14
+OUT 2
6.5
15
+OUT 1
6.5
16
17
−OUT 1
6.5
18
V
1
PWR-GND 2
0
PWR-GND 1
0
CC
Pin voltage (V)
13.2
No. A1783-3/9
LA4708N
Sample Print Pattern
V
CC
1
+
C
5
+
C
IN1
1
+
C
2
C
6
OUT1
R
R
2
1
GND
STB
+
C
3
C
7
IN2
C
4
+
R
3
OUT2
C
R
8
4
GND
Copper foil area 90 × 105mm2
C
R
9
5
Description of External Components
C1, C4
Input capacitors
2.2μF is recommended. f can be varied by C1, C4 capacitances to adjust the bass range.
L
C2
Decoupling capacitor
(ripple filter)
C3
Amplifier on time setting
capacitor
Approximately 0.8 second for 33μF. Since the on time is proportional to this capacitance, it can
be set as desired by varying this capacitance. (Refer to the characteristics curve.)
C5
Power supply capacitor
C6, C7, C8, C9
Oscillation blocking capacitors
Use polyester film capacitors (Mylar capacitors) with good temperature characteristics. (R2, R3,
R4, and R5 used jointly.) Since stability may be affected slightly by the pattern layout, etc.,
0.1μF or more is recommended.
R1
Standby switch current
limiting resistor
10kΩ is recommended (when the applied voltage for the standby switch is 2.5V to 13.2V). This
resistor cannot be removed.
No. A1783-4/9
LA4708N
Features of IC Inside and Usage Notes
Standby function
• Pin 5 is the standby switch pin. The amplifier is
turned on by applying approximately 2.5V or more
to this pin through an external resistor (R1).
• If voltage in excess of 13.2V is to be applied to the
standby switch, calculate the value of R1 using the
following formula so that the current flowing into
pin 5 is 500μA or less:
Applied voltage − 1.4V
R1 =
− 10kΩ
500μA
Mute function
• Pin 6 is the connector for the capacitor that determines the on time in order to prevent pop noise. By grounding this
pin, the amplifier can implement mute operation. In this case, the recovery time depends on C3.
How to reduce pop noise
• Although the LA4708N reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2μF can be connected
between pin 8 and the pre-GND to further reduce pop noise that occurs when power supply is turned on/off
(standby switch on/off). The larger the capacitance, the lower the frequency of pop noise, and it is barely audible,
but sound residue of the sound signal is liable to linger when power is turned off. Pin 8 is the bias pin for the output
amplifier and normally is left open.
Protectors
• In an output-to-ground and output-to-V
short protector system configuration, if a DC resistor is connected
CC
between amplifier output pin and GND, the protector may operate, causing the amplifier not to start operating.
Therefore, as a general rule, no DC resistor should be connected between amplifier output pin and GND.
• In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4708N has a thermal
shutdown protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180°C due to inadequate
heat dissipation, the thermal shutdown protector will operate to control the output gradually into attenuation.
• Also be fully careful of handling other protectors built in the LA4708N.
Miscellaneous
• Since pins 1 and 9, which are unused, are connected internally, they must be left open.
• Pin 10 is an NC pin (no internal connection).
No. A1783-5/9
LA4708N
I
-- V
CC
P
-- V
CCO
O
IN
200
180
5
R
Rg = 0
V
= Open
R
= 4Ω
L
L
3
2
f = 1kHz
= 5V
Rg = 600Ω
ST
160
140
120
100
80
VG = 40dB
10
Dual channel drive
7
5
3
2
1.0
7
5
60
40
3
2
0.1
20
7
5
0
0
4
8
12
16
20
-- V
24
28
3
5
7
2
3
5
7
2
3
5
10Input level, V -- mVr1m00s
Supply voltage, V
CC
JK470806
IN
JK470807
P
-- V
CC
P
-- V
CC
O
O
48
60
50
40
30
20
10
0
f = 1kHz
Rg = 600Ω
THD = 30%
Dual channel drive
f = 1kHz
Rg = 600Ω
THD = 10%
44
40
Dual channel drive
36
32
28
24
20
16
12
8
4
6
8
10
12
14
16
18
20
6
8
10
12
14
16
18
20
Supply voltage, V
-- V
Supply voltage, V
-- V
CC
CC
JK470808
JK470809
THD -- P
O
THD -- P
O
5
3
2
V
R
= 13.2V
= 4Ω
V
R
= 13.2V
= 2Ω
CC
L
CC
L
3
2
Rg = 600Ω
Dual channel drive
Rg = 600Ω
Dual channel drive
10
10
7
5
7
5
3
2
3
2
1.0
7
5
1.0
7
5
3
2
3
2
0.1
7
5
0.1
7
5
3
0.1
2
3
5
7
2
3
5
7
10
2
3
5
2
3
5
7
2
3
5
7
2
3
5
7
1.0
0.1
1.0
Output power, P --1W0
Output power, P -- W
O
O
JK470810
JK470811
THD -- f
f Response
5
4
2
V
R
= 13.2V
V
R
= 13.2V
CC
= 4Ω
CC
= 4Ω
3
2
L
L
Rg = 600Ω
= 2W
Rg = 600Ω
= 0dBm at f = 1kHz
P
O
V
O
0
1.0
7
5
-2
3
2
-4
-6
-8
0.1
7
5
3
10
-10
10
2
3
5
7
2
3
5 7
2
3
5
7
2
3
5 7
2
3
5
7
2
3
5 7
2
3
5
7
2
3
5 7
100k
100
1k
10k
100k
JK470812
100
1k
10k
Input frequency, f -- Hz
Input frequency, f -- Hz
JK470813
No. A1783-6/9
LA4708N
P
-- f
CH Sep -- f
O
24
22
20
18
16
14
12
10
20
0
V
= 13.2V
CC
= 4Ω
R
L
Rg = 10kΩ
= 0dBm
V
O
THD = 10%
-20
-40
-60
-80
-100
3%
1%
V
= 13.2V
= 4Ω
CC
R
L
Rg = 600Ω
VG = 40dB
Dual channel drive
2
3
5
7
2
3
5 7
2
3
5
7
10k
2
3
5
7
2
3
5 7
2
3
5 7
2
3
5
7
2
3
5 7
10
100
1k
10
100
1k
10k
100k
JK470815
Input frequency, f -- Hz
Input frequency, f -- Hz
JK470814
V
-- Rg
SVRR -- V
CC
NO
1.0
0
V
R
= 13.2V
= 4Ω
R
L
= 4Ω
CC
L
7
Rg = 0
DIN AUDIO
f
V
= 100Hz
R
5
-20
-40
= 0dBm
CCR
3
2
0.1
-60
7
5
-80
3
2
2200μF (power supply capacitor)
is changed to 0.47μF (Mylar)
-100
2
3
5
7
2
3
5
7
2
3
5
7
2
4
6
8
10
12
14
16
18
20
1k
10k
100k
Input resistance, Rg -- Ω
Supply voltage, V
-- V
JK470816
CC
JK470817
SVRR -- f
R
SVRR -- V
CCR
20
0
0
V
R
Rg = 0
= 13.2V
V
= 13.2V
CC
= 4Ω
CC
= 4Ω
R
f
L
L
R
= 100Hz/3kHz
-20
-40
-60
V
= 0dBm
CCR
-20
-40
-60
-80
-100
OUT2
OUT2
fR = 100Hz
fR = 3kHz
OUT1
OUT1
-80
The value of power supply capacitor is 0.47μF (Mylar)
V
O
Calculate as SVRR = 20 log
V
The value of power supply capacitor is 0.47μF (Mylar)
CCR
-100
2
3
5
7
2
3
5 7
2
3
5
7
2
3
5 7
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Power supply ripple voltage, V
10
100
1k
10k
100k
JK470818
Ripple frequency, f -- Hz
-- Vrms
JK470819
R
CCR
Pd, I
-- P
O
Pd, I
-- P
CC
CC
O
2
2
2
2
R
= 4Ω
R = 2Ω
L
L
Rg = 600Ω
f = 1kHz
Rg = 600Ω
100
10
10
100
f = 1kHz
Dual channel drive
Dual channel drive
7
5
7
5
7
5
7
5
Allowable power dissipation package
Pd max = 37.5W
3
2
3
2
3
2
3
2
Pd (V
= 13.2V)
CC
10
1.0
1.0
10
7
5
7
5
7
5
7
5
3
2
3
2
3
2
3
2
7
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5
7
0.1
1.0
10
0.1
1.0
10
Output power, P -- W
Output power, P -- W
O
JK470820
O
JK470821
No. A1783-7/9
LA4708N
V
-- V
CC
I
-- Ta
N
CCO
12
10
8
200
R
Rg = 0
= Open
V
R
Rg = 0
= 13.2V
L
CC
= Open
180
160
140
120
L
6
100
80
4
60
40
2
0
20
0
0
4
8
12
16
20
24
28
100
8
-40
-20
0
20
40
60
80
100
100
2
Supply voltage, V
CC
-- V
Ambient temperature, Ta -- °C
JK470822
JK470823
P
-- Ta
THD -- Ta
O
36
5
V
R
= 13.2V
CC
= 4Ω
34
32
L
Rg = 600Ω
3
2
f = 1kHz
P
= 2W
Dual channel drive
O
30
28
26
24
22
20
18
16
V
= 13.2V
CC
Rg = 600Ω
f = 1kHz
THD = 10%
0.1
7
5
Dual channel drive
3
2
-40
-20
0
20
40
60
80
JK470824
-40
-20
0
20
40
60
80
JK470825
Ambient temperature, Ta -- °C
Ambient temperature, Ta -- °C
V
-- V
ST
Amp ON time -- C3
N
8
7
6
5
4
3
2
1
0
1.2
1.0
0.8
0.6
0.4
0.2
V
= 13.2V
CC
= 4Ω
R
L
Rg = 0
V
CC
V
ST
= 13.2V
= 5V
Apply V to standby pin (pin 5)
ST
through 10kΩ.
(Apply to pin 5 through 10kΩ.)
0
0
1
2
3
4
5
6
7
2
3
5
7
2
3
5
7
10
100
Standby pin applied voltage, V -- V
ST
C3 -- μF
JK470826
JK470827
PS No. A1783-8/9
LA4708N
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 June 2010. Specifications and information herein are subject to change
without notice.
PS No. A1783-9/9
相关型号：
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