LA4445 [SANYO]
5.5W 2-Channel AF Power Amplifier; 5.5W双通道AF功率放大器
| 型号： | LA4445 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | 5.5W 2-Channel AF Power Amplifier |
| 文件： | 总7页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number:ENN1277E
Monolithic Linear IC
LA4445
5.5W 2-Channel AF Power Amplifier
Features
• Dual channels.
Package Dimensions
unit:mm
Output : 5.5W×2 (typ.)
• Minimun number of external parts required.
• Small pop noise at the time of power supply ON/OFF and
good starting balance.
3049A-SIP12H
[LA4445]
27.0
20.0
4.0
• Good ripple rejection : 46dB (typ.)
• Good channel separation.
• Small residual noise (Rg=0).
• Built-in protectors.
a. Thermal protector
b. Overvoltage, surge protector
c. Adjacent pins (9-10, 9-8) short protector
1
12
0.4
2.0
2.5
2.0
1.0
0.5
SANYO : SIP12H
Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter
Symbol
Conditions
Ratings
Unit
V
V
V
V
max1 Quiescent (t=30s)
25
18
CC
CC
Maximum supply voltage
max2 Operating
V
(surge)
peak
Surge supply voltage
t≤0.2s
50
V
CC
I
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
1 channel
3.5
15
A
O
Pd max
Topr
See Pd max – Ta characteristic.
W
˚C
˚C
–20 to +75
Tstg
–40 to +150
Operating Conditions at Ta = 25˚C
Parameter
Recommended supply voltage
Recommended load resistance
Operating voltage range
Symbol
Conditions
Ratings
Unit
V
V
13.2
4
CC
Ω
R
L
2 channels
V
op
10 to 16
V
CC
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)/90196RM/N283KI, TS No.1277–1/7
LA4445
3
Operating Characteristics at Ta = 25˚C, V =13.2V, R =4Ω, f=1kHz, Rg=600Ω, with 100×100×1.5mm
CC
L
Al heat sink, See specified Test Circuit.
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
Quiescent current
Voltage gain
I
75
150
mA
dB
W
cco
V
49.5
5.0
51.5
5.5
53.5
1.0
G
Output power
P
THD=10%, 2 channels
=1W
O
Total harmonic distortion
Input resistance
THD
P
0.15
30
%
O
r
i
kΩ
mV
mV
dB
dB
Rg=0
0.6
1.0
2.0
Output noise voltage
V
NO
Rg=10kΩ
1.0
Ripple rejection
R
r
Rg=0, V =200mV, f =100Hz
46
R
R
Channel separation
Ch sep
Rg=10kΩ, V =0dBm
45
55
O
Equivalent Circuit Block Diagram
Sample Application Circuit
No.1277–2/7
LA4445
Sample Printed Circuit Pattern
Proper Cares in Mounging Radiator Fin
1. The mounting torque is in the range of 39 to 59N · cm.
2. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC.
With case outline dimensions L and R referred to, the screws must be tightened with the distance between them as
close to each other as possible.
3. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined
by JIS. Washers must be also used to protect the IC case.
4. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on the
junction surface, it must be applied uniformly on the whole surface.
5. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.
No.1277–3/7
LA4445
Description of External Parts
C1 (C2) :
C3 (C4) :
C5 (C6) :
C7 (C8) :
C9 :
Feedback capacitor
Low cutoff frequency f depends on this feedback capacitor. Increasing the capacitor value makes the
starting time later
Bootstrap capacitor
If the capacitor value is decreased, the output at low frequencies goes lower.
(Recommended value : 47µF min.)
L
Oscillation blocking capacitor
Polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is
recommended. The capacitor value can be reduced to 0.047µF depending on the stability of the board.
Output capacitor
The low cutoff frequency depends on this output capacitor. In bridge connection applications the output
capacitor must be normally connected.
Decoupling capacitor
Used for the ripple filter. Since the rejection effect is saturated at a certain capacitor value, it is mean-
ingless to increase the capacitor value more than needed. This capacitor, being also used for the time
constant of the pop noise preventer, affects the starting time. Too small a capacitor value makes the pop
noise level higher.
C10 :
Power source capacitor.
R1 (R2) :
Oscillation blocking filter resistor.
IC Application
1. V.G. can be reduced by connecting R ’ to the N.F. pin (pins 1, 6)
NF
V.G. is calculated by the following formula.
VG=20log R / (R +R ’)
f
NF
NF
where R =20kΩ, R =50Ω
f
NF
The usable lower limit of VG is 36dB or thereabouts. When setting VG, oscillation and high cutoff frequency f
H
must be considered.
2. External audio muting method
Proper Cares in Using IC
· If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum
rating to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and
use the IC in the range where the maximum ratings is not exceeded.
· Printed circuit board
When making the board, refer to the sample printed circuit pattern. No feedback loop must be formed between input and
output. Both Pins GND and Power GND must be shorted at the root of IC pin so that the common impedance can be
reduced.
· Others
The radiator fin on the package must be normally connected to GND.
Some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when
connecting. In this case, the load is shorted, which may break down the IC.
No.1277–4/7
LA4445
No.1277–5/7
LA4445
Sample Application Circuit : Bridge connection application
No.1277–6/7
LA4445
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 exported without obtaining 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 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.1277–7/7
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