LA4446.PDF

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LA4446
Ordering number:ENN2636C
Monolithic Linear IC
LA4446
Car Stereo-Use
5.5W 2-Channel AF Power Amplifier
2 (typ.)
• Low pop noise at the time of power supply ON/OFF and
good starting balance.
• Good ripple rejection : 46dB (typ.)
• Good channel separation.
• Low residual noise (Rg=0).
• On-chip protectors.
a. Thermal protector
b. Overvoltage/surge protector
c. Adjacent pins (7-8, 6-7) short protector
´
Package Dimensions
unit:mm
3107-SIP13H
[LA4446]
25.6
2.0
2.4
3.4
10.0
1
13
0.4
0.8
2.0
0.5
1.15
1.2
Specifications
Absolute Maximum Ratings at Ta = 25˚C
SANYO : SIP13H
P
S
C
R
U
V C
m
Q
(
2
V
M
s
v
V C
m
O
1
V
S
s
v
V C
s
t £
0
5
V
M
o
c
I O
p
P
c
3
A
A
p
d
P
m
S
P
m
–
T
c
1
W
O
t
T
–
t
+
˚C
˚C
S
t
T
–
t
+
Operating Conditions at Ta = 25˚C
P
S
C
R
U
R
s
v
V C
1
V
R
l
r
R L
2
c
4
W
O
v
r
V C o
1
t
1
V
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)/N3093TS/8240TS/9177AT, TS No.2636–1/7
Features
• Dual channels.
Output : 5.5W
11028127.004.png 11028127.005.png 11028127.006.png
LA4446
Operating Characteristics at Ta = 25˚C, V CC =13.2V, R L =4
W
, f=1kHz, Rg=600
W
, with 100
´
100
´
1.5mm 3
Al heat sink
R
P
S
C
U
m
t
m
Q
c
I
7
1
m
V
g
V
4
5
5
d
O
p
P
T
2
c
5
5
W
T
h
d
T
P O =
0
1
%
I
r
r
3
k
W
O
n
v
V N
R
0
1
m
R
W
1
2
m
R
r
S
R
C
=
f
4
d
C
s
C
s
R
W
,
V
4
5
d
Equivalent Circuit Block Diagram
Sample Application Circuit
No.2636–2/7
V
11028127.007.png
LA4446
Sample Printed Circuit Pattern (Cu-foiled area)
* Mounting the heat sink, use a flat screw. Mounting torque : 39 to 59N · cm
Features of IC System
· 2-channel use.
· Decoupling capacitor C9=220
m
F is used to reject ripple and determine the delay time at the time of application of
power.
· A low roll-off frequency depends on the NF capacitor. Refer to the graph. To extend f L , the output capacitor must be
also considered.
· To make the pop noise much less, connect R NF ’ to NF capacitors C1, C2 to decrease the gain.
VG
»
20log [dB]
Rf
R NF
R NF »
50
, Rf=20k
on chip
When R NF ’=50
W
is connected to NF capacitors C1, C2 externally, the gain becomes approximately 46dB. When
is connected additionally, the gain becomes approximetely 40dB.
· Ripple rejection, total hermonic distortion, and oscillation depend on the layout of the printed circuit board. Large-
signal GND, small-signal GND processing and parts GND points must be considered particularly.
· When providing external audio muting intentionally, the IC can be out off by connecting decoupling pin ª to GND
through limiting resistor 50 to 100
W
W
Continued on next page.
No.2636–3/7
W
W
R NF ’=150
.
11028127.001.png
LA4446
Continued from preceding page.
· The V CC out pin adjacent to other pins with a space of 2mm pitch is liable to undergo breakdown caused by solder
bridge in the manufacturing process. Therefore, pins ¦-¥, ¦-¤ DC short protectors are contained. The LA4446 is
designed to operate from car-use voltage refulation 10.5 to 15.6V.
· Overvoltage/surge protector.
Used to withstand giant pulses of positive surge 50V/200ms. The test is conducted based on the JASO standard in
principle. The overvoltage protector is activated at V CCX »
· Thermal protector.
Used to prevent instantaneous breakdown of the IC that may be caused by improper thermal design or abnormal state
such as AC load short. The thermal protector is activated at Tj=160
°
C.
No.2636–4/7
24.5V.
11028127.002.png
LA4446
Sample BTL
No.2636–5/7
11028127.003.png

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