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PDF LA4905 Data sheet ( Hoja de datos )
| Número de pieza | LA4905 | |
| Descripción | 17-W / 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems | |
| Fabricantes | Sanyo | |
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Ordering number : EN5504
Monolithic Linear IC
LA4905
17-W, 2-Channel BTL AF High-Efficiency
Power Amplifier for Car Stereo Systems
Overview
The LA4905 is a BTL 2-channel power amplifier IC for
use in car audio systems. Increases in the number of
external components are held to a minimum by adopting
both a signal-following type switching scheme in the
amplifier’s output stage power supply, and a newly-
developed nonlinear amplifier that has nonlinear
characteristics in the signal system. The power dissipation
(thermal loss) in the actual operating range has been
reduced to about 1/2 that of earlier class B amplifier ICs.
This contributes significantly to miniaturization of the heat
sink and to reduction of heating within the set.
Features
• Power dissipation reduced by 50% (When average
music power is measured, and when compared to earlier
Sanyo products.)
• The number of required signal follower circuits has been
reduced to a single circuit for two channels, allowing the
number of external components to be reduced.
• The output is a pure analog signal: no switching noise is
output to the output lines.
• Operates on an 8 to 18-V single-voltage power supply.
• Full complement of built-in protection circuits (shorting
to the power supply, shorting to ground, overvoltage,
and thermal protection)
• Built-in standby switch
Package Dimensions
unit: mm
3160-SIP23HZ
[LC4905]
SANYO: SIP23HZ
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Maximum supply voltage
Maximum output current
Allowable power dissipation
VCC max1
VCC max2
IO Peak
Pd max
No input, t = 1 minute
(Per channel)
With an arbitrarily large heat sink
Operating temperature
Topr
Storage temperature
Tstg
Notes: 1. Set VCC and RL in the range where Pd max does not exceed 37.5 W.
2. The overvoltage protection circuit operates when VCC is 20 V or higher.
Ratings
24
18
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
83096HA (OT) No. 5504-1/10
1 page  
Sample Printed Circuit Board Pattern
LA4905
1. External Component Functions
C1, C2
C3
C4
C5, C6,
C7, C8
C9
C10
C11
C12
R5
TR1
D1
L1
• Input capacitors; recommended value: 2.2 µF. Note that the low-frequency band can be adjusted by changing
the values of C1 and C2, since fL depends on their value, although the value must not exceed 3.3 µF (when
C4 is 22 µF) due to pop noise considerations.
• Beep amplifier input capacitor. Use the same value as that used for C1 and C2. Connect the beep amplifier to
PRE-GND through C3 if the beep function is not used.
• Amplifier power-on delay time setting capacitor; recommended value: 22 µF. At the recommended value, the
amplifier will turn on in about 0.7 second after power is applied. The delay time is proportional to the
capacitance and can be set to an arbitrary value. However, a value of 22 µF or larger should be used due to
pop noise considerations.
• Oscillation prevention capacitors. Use capacitors with excellent temperature characteristics such as polyester
film or Mylar capacitors. These capacitors function in conjunction with R1, R2, R3, and R4. We recommend
using capacitors of 0.1 µF or larger, since the stability varies somewhat depending on the printed circuit
board layout.
• Decoupling capacitor (ripple filter)
• Power-supply capacitor
• Switching regulator oscillation prevention capacitor; recommended value: 1500 pF.
• Switching regulator output smoothing capacitor. The LA4905 adopts a self-excitation switching regulator
scheme. Since this capacitor influences the stability of the self-excitation and the regulator efficiency, there is
an optimal value. We recommend the use of a 2.2-µF, 25-V OS capacitor with good temperature
characteristics. Note that a 2.2-Ω, 1/2-W resistor should be used for R5 for the same reason.
• Standby switch current limiting resistor; recommended value: 10 kΩ.
(When the voltage applied to the standby switch is between 3 and 13.2 V.) Note that this resistor cannot be
removed. See the section "Standby Function" elsewhere in this document.
• External switching transistor. We recommend using a 2SD1668 of rank S. A 2SD1667 of rank S may be used if
the application is designed to handle 4-Ω loads (RL). A heat sink must be provided along with that for the IC.
• Flywheel diode that takes up the coil energy. We recommend using an SB40-05J, which is a Schottky barrier
diode with a low VF.
An SB10-05A2 may be used if the application is designed to handle 4-Ω loads (RL). A joint heat sink is not
required.
• We recommend the use of the HP-022Z 180-µH coil manufactured by Tokin, Ltd. The 200-µH HP-011Z may
be used if the application is designed to handle 4-Ω loads (RL).
No. 5504-5/10
5 Page | ||
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