Ordering number : ENN6630
O3100RM (OT) No. 6630-1/9
Overview
The LA4743B is a 45 W 4-channel power amplifier IC for
car stereo systems. It features a built-in bridge circuit and
the ability to radically reduce the number of external
components required. It is also pin compatible with the
LA4743A, which differs in the amount of gain provided.
Features
Maximum output power: 45 W
×
4 channels
(V
CC
= 14.4 V, 4
load, 1 kHz)
40 W
×
4 channels (V
CC
= 13.7 V, 4
load, 1 kHz)
Requires only seven external components and does not
require an oscillation prevention RC circuit, a noise
filter, or a BS capacitor.
Functions
Muting function
Built-in standby switch
Full complement of built-in protection circuits,
including protection from shorting to V
CC
, shorting to
ground, load shorting, overvoltages, and overheating.
Package Dimensions
unit: mm
3236-HZIP25
2.0
2.0
29.2
25.6
2.60
(1.0)
0.53
R1.7
0.4
1
1
4.5
1
3
4.0
4.0
SANYO: HZIP25
[LA4743B]
LA4743B
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
45 W Four-Channel (Bridge Circuit) Power Amplifier
Monolithic Linear IC
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.
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max1
V
CC
max2
I
O
peak
Pd max
Signal present
18
V
No signal (for 1 minute)
26
V
Maximum output current
4.5/ch
A
Allowable power dissipation
With an arbitrarily large heat sink
50
W
Operating temperature
Topr
–40 to +85
°C
Storage temperature
Tstg
θ
jc
–40 to +150
°C
Package thermal resistance
1
°C/W
Specifications
Maximum Ratings
at Ta = 25°C