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PDF LA4742 Data sheet ( Hoja de datos )
| Número de pieza | LA4742 | |
| Descripción | 45 W Four-Channel Bridge Circuit Power Amplifier | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : ENN7043
Monolithic Linear IC
LA4742
45 W Four-Channel (Bridge Circuit) Power Amplifier
Overview
The LA4742 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.
Features
• Maximum output power: 45 W × 4 channels
(VCC = 14.4 V, 4 Ω load, 1 kHz)
• 40 W × 4 channels (VCC = 13.7 V, 4 Ω 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
• Output offset detection function (DDL)
• Warning tone (beep) generation function
• Muting function
• Built-in standby switch
• Full complement of built-in protection circuits,
including protection from shorting to VCC, shorting to
ground, load shorting, overvoltages, and overheating.
• Maximum supply voltage before damage in the open
ground state: 16 V
Package Dimensions
unit: mm
3236-HZIP25
[LA4742]
29.2
25.6
2.60 (1.0)
2.0 2.0
0.53
4.5
R1.7
0.4
4.0 4.0
SANYO: HZIP25
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Package thermal resistance
Symbol
VCC max1
VCC max2
IOpeak
Pd max
Topr
Tstg
θjc
Conditions
Signal present
No signal (for 1 minute)
With an arbitrarily large heat sink
Ratings
18
26
4.5/ch
50
–40 to +85
–40 to +150
1
Unit
V
V
A
W
°C
°C
°C/W
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
92101TN (OT) No. 7043-1/9
1 page  
LA4742
Continued from preceding page.
Pin No. Function DC voltage [V]
Notes
Internal equivalent circuit
Input amplifier
ST-BY power
supply line
11 IN1
12 IN2
14 IN4
15 IN3
• Input amplifiers that require no
3.1 capacitor in the input noise filter.
13 PRE GND
30 kΩ
VREF
100 Ω
11
12
14
15
Bias circuit
power supply line
5 pF
1 kΩ
Inverter
amplifier
A13769
20 kΩ
16 ON TIME MUTE 2.6
• Amplifier turn-on time control circuit
• Impulse noise prevention circuit
• With a 22 µF capacitor, the turn-on
time will be 0.6 s.
VREF
200 Ω
16
2 kΩ
40 kΩ
10 kΩ
2 kΩ
13 kΩ
Input amplifier
ST-BY power
supply line
3 kΩ
A13770
1 kΩ
22 MUTE
4.1
• The muting function is activated when
the applied voltage is under 1 V.
VREF
Amplifier
bias circuit
25 CLIPDET
7.5 kΩ 10 kΩ
100 kΩ
100 Ω
22
VREF
A13771
No. 7043-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA4742.PDF ] | |
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