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PDF LA4906 Data sheet ( Hoja de datos )
| Número de pieza | LA4906 | |
| Descripción | 17-W / 2-Channel BTL AF High-Efficiency Power Amplifier for Car Audio Systems | |
| Fabricantes | Sanyo | |
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Ordering number : EN *5714
Preliminary
Monolithic Linear IC
LA4906
17-W, 2-Channel BTL AF High-Efficiency
Power Amplifier for Car Audio Systems
Overview
The LA4906 is a BTL two-channel power amplifier for
use in car audio systems. It uses a signal-following
switching technique in the power supply for the amplifier
output stage and a newly-developed nonlinear amplifier
that features nonlinear characteristics in the signal system.
These features hold increases in the number of external
components to a minimum, and reduce power dissipation
(and thus heat generation) in the practical operating region
to about 1/2 that of earlier class B amplifier ICs. This can
contribute significantly to miniaturization and weight
reduction in the heat sink and to reduction of the heat
generated within the end product case.
Features
• Power dissipation reduced by 50% (for music at average
power levels, as compared to earlier Sanyo products)
• The number of required signal-following switching
circuits has been reduced to just one circuit for two
channels, reducing the number of external components.
• The output is a pure analog signal; no switching noise
whatsoever appears on the output lines.
• Uses a single-voltage power supply from 8 to 18 V.
• Provides a full range of built-in protection circuits,
including shorting of output pin to VCC, shorting of
output pin to ground, overvoltage, and thermal
shutdown protection.
• Built-in standby switch
• Clipping detection function
Package Dimensions
unit: mm
3160-SIP23HZ
[LA4906]
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max1
VCC max2
IO Peak
Pd max
Topr
Tstg
Conditions
With no signal, t = 1 minute
Per channel
With an arbitrarily large heat sink
Notes: 1. Set VCC and RL to be in the range where Pd max does not exceed 37.5 W.
2. The overvoltage protection circuit operates at VCC = 26 V or higher.
SANYO: SIP23HZ
Ratings
18
16
4.5
37.5
–35 to +85
–40 to +150
Unit
V
V
A
W
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5714-1/10
1 page  
Sample Printed Circuit Board
LA4906
1. External component descriptions
C1 and C2
· Input capacitors. A value of 2.2 µF is recommended for these capacitors. Note that the low-frequency area
characteristics can be adjusted by changing fL, which is determined by the values of C1 and C2. However, due to
impulse (pop) noise considerations, the value of C1 and C2 should not exceed 3.3 µF when C4 is 22 µF.
C3
· Beep amplifier input capacitor. A value the same as that of C1 and C2 is used. If the beep function is not used, connect
the beep input to PRE-GND through C3.
C4
· Set the amplifier turn-on time. A value of 22 µF is recommended. (This will result in a turn-on time of about 0.7
second.) The on time is proportional to the value of this capacitor, and any value may be used. However, due to
impulse (pop) noise considerations, a value of 22 µF or larger should be used.
C5, C6, C7, and C8
· Oscillation prevention capacitors. Polyester film (Mylar) capacitors with good temperature characteristics must be used.
(These are used together with R1, R2, R3, and R4.) We recommend values of 0.1 µF or higher for these capacitors
since the stability will differ somewhat depending on the printed circuit board layout actually used.
C9
· Decoupling capacitor (ripple filter)
C10
· Power-supply capacitor
C11
· Oscillation prevention capacitor for the switching regulator. A value of 1500 pF is recommended.
C12
· Switching regulator output smoothing capacitor. The LA4906 adopts a self-excited switching regulator technique. The
value of this capacitor must be optimized, since it influences both the self-excitation stability and the regulator
efficiency. We recommend using a 2.2-µF 25-V OS (Organic Semiconductor) capacitor with a low series resistance
and good temperature characteristics. Note that for the same reason a 2.2-Ω 1/2-W resistor should be used for the
associated resistor R6.
R5
· Standby switch current limiter resistor. A value of 10 kΩ is recommended. (When the voltage applied to the standby
switch is in the range 3 to 13.2 V.) Note that this resistor cannot be removed from this circuit.
No. 5714-5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LA4906.PDF ] | |
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