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.
Monolithic Linear IC
8.5W 2-Channel AF Power Amplifier
Ordering number:ENN1440E
LA4508
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21500TN (KT)/D0994JN/O147KI/8056/8064/N283 No.1440–1/7
Package Dimensions
unit:mm
3023A-SIP14H
[LA4508]
SANYO : SIP14H
Features
• Low idling current (20mA/2 channels).
• Output power 8.5W × 2 typ. (R
L
=3Ω).
• High ripple rejection (60dB at steady state).
• Small pop noise at the time of power supply ON.
• Thermal protector .
• Adoption of SIP14H (θj-c=3°C/W) facillitates thermal
design.
˚C
˚C
Operating Conditions at Ta = 25˚C
Specifications
Absolute Maximum Ratings at Ta = 25˚C
14
1
13.8
0.6
37.0
30.0
R1.7
11.0
8.0
0.8min
6.0 15.0max
1.99 2.54 1.4 0.4
4.5
2.25
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egatlovylppusmumixaMV
CC xam 42V
noitapissidrewopelbawollAxamdPknistaehetinifnihtiW 51W
tnerructuptuomumixaM
IOkaep
lennahc1 5.2A
erutarepmetgnitarepOrpoT 57+ot02–
erutarepmetegarotSgtsT 051+ot04–
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppusdednemmoceRV
CC 51V
egnaregatlovgnitarepOV
CC *.dedeecxeebtontsumxamdP 32ot9V
ecnatsiserdaoldednemmoceRR
Lslennahc2 3 Ω
Operating Characteristics at Ta = 25˚C, V
CC
=15V, R
L
=3Ω (2 channels), f=1kHz, Rg=600Ω,
See specified test circuit.
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nimpytxam
tnerructnecseiuQI
OCC slennahc2010203Am
niagegatloVGV244464Bd
ecnereffidniagegatloV ∆GV 2hc,1hc 1±Bd
rewoptuptuOP
O%01=DHT5.75.8W
Continued on next page.
LA4508
No.1440–2/7
Continued from preceding page.
Equivalent Circuit
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nimpytxam
noitrotsidcinomrahlatoTDHTV
OV2=51.00.1%
ecnatsisertupnIr
i03kΩ
egatlovesiontuptuO VON 1F.P.B,zHk02otzH02=f,0=gR2.05.0Vm
VON 2k01=gR ΩF.P.B,zHk02otzH02=f,3.00.1Vm
noitcejerelppiRR
r5406Bd
noitarapeslennahCpeshc5455Bd
Sample Application Circuit
LA4508
No.1440–3/7
Sample Printed Circuit Pattern (Cu-foiled area)
Description of External Parts
C
1
: Decoupling capacitor
Used for the ripple filter. Since the rejection effect is saturated at a certain capacity, it is meaningless to
increase the capacity more than needed. This capacitor, being also used for the time constant of the pop
noise preventer, affects the starting time. Too small a capacity makes the pop noise level higher.
(Recommended v a lue : 100µF to 330µF)
C
2
(C
3
) : Feedback capacitor
Since the low cutoff frequency depends on this feedback capacitor, the required bandwidth must be
considered before determining the value of this feedback capacitor. This feedback capacitor also affects
the starting time.
C
4
(C
5
) : Switching distortion suppressing capacitor
Used to suppress switching distortion which often appears at high frequencies in overinput mode. The
recommended value is 0.01µF (ceramic capacitor).
C
6
(C
7
) : Bootstrap capacitor
The output at low frequencies depends on this capacitor. If the capacity is decreased, the output at low
frequencies goes lower. 47µF min. is required. (This, however, does not apply if load R
L
is light.)
C
8
(C
9
) : Output capacitor
The low cutoff frequency depends on this output capacitor. (Refer to the characteristic graph.)
C
10
(C
11
) : Oscillation blocking capacitor
Polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is used.
The use of an aluminum electrolytic capacitor or ceramic capacitor may cause oscillation to occur at
low temperatures.
C
12
: Power source capacitor.
This power source capacitor must accomodate loads (motor, etc.) in the power line or ripple in the
transformer ouput. This recommended value is 1000µF to 2200µF. Continued on next page.
LA4508
No.1440–4/7
Continued from preceding page.
R
1
(R
2
) : Normally, this resistor is required.
If the IC is used at V
CC
=9V or thereabouts, clip balance may be disturbed. This resistor can be used to
correct such disturbance.
D
1
: When a motor is started, or in similar modes, the supply voltage drops abruptly, causing the filter
transistor to be saturated. This diode is a bypass diode and can be used to prevent such saturation from
occurring. Whether or not to use this diode depends on the set to be made.
LA4508
No.1440–5/7
LA4508
No.1440–6/7
Proper Cares in Using IC
1. 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, thereb y leading to breakdown. Allow an ample margin of variation f or supply voltage, etc. and
use the IC in the range where the maximum ratings is not exceeded.
2. Pin-to-pin short, inverted insertion
If supply voltage is applied when the space between pins is shorted, breakdown or deterioration may occur. W hen
mounting the IC on the board or applying supply voltage, make sure that the space between pins is not shorted with
solder, etc. If the IC is inserted inversely, it may be broken down momentarily because of pin 7 : Power Gnd, pin 8 :
V
CC
.
3. Load short
If the IC is used with the load shorted for a long time, breakdo wn or deteriora tion may occur. Be sure not to short the
load.
4. Change in closed-loop gain
By connecting R
NF
in series with pins 3, 12 (NF pin), the gain can be reduced, but the following must be noted.
a. If R
NF
is connected, the ripple bypass effect brought about by the NF capacitor is lessened, leading to insuffi-
cient ripple rejection.
b. Do not operate at 40dB or less so that stable oscillation is maintained.
5. When the IC is used in radios or radio-cassette tape recorders, keep a good distance between IC and bar antenna.
A capacitor of 0.022µF or more (polyester film capacitor) connected between pins 9 and 7 and between pins 6 and 7
acts effectively against radiation to the SW band.
6. Printed circuit board
When making the board, refer to the sample printed circuit pattern. No feedback loop must be formed between input
and output and make the line thick and short so that no common resistor exists between pre-GND and power-GND.
Continued on next page.
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.
LA4508
PS No.1440–7/7
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 equi valent to the truss machine screw or binder machine scre w def ined 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 radia tor 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.
Continued from preceding page.
7. Some plug jacks to be used for connecting to the external speaker are such that both poles are short-circuited once
when connecting. In this case, the load is short-circuited, which may break down the IC.
8. Improvement in reduced voltage characteristic (Reference example).
By connecting parts as sho wn below, distortion-free operation can be performed at a supply voltage do wn to V
CC
=4.5V
or thereabouts. The capacitor of 100µF is connected to suppress pop noise.
