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PDF LA4708 Data sheet ( Hoja de datos )
| Número de pieza | LA4708 | |
| Descripción | 20 W 2-channel BTL AF Power Amplifier for Car Stereos | |
| Fabricantes | Sanyo | |
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Ordering number: EN5245A
Monolithic Linear IC
LA4708
20 W 2-channel BTL AF Power Amplifier
for Car Stereos
Overview
The LA4708 is a BTL two-channel power IC for car audio
developed in pursuit of excellent sound quality. Low-region
frequency characteristics have been improved through the use
of a new NF capacitorless circuit, and crosstalk which causes
‘‘muddy’’ sound has been reduced by improving both circuit
and pattern layout. As a result, the LA4708 provides powerful
bass and clear treble. In addition, the LA4708 features on-chip
protectors and standby switch. The LA4708 is also
pin-compatible with the LA4705NA (car stereo-use 17 W
two-channel power IC), and can be substituted for the
LA4705NA for higher power. (When the board is shared, pins
1 and 9 must be left open.)
Package Dimensions
unit: mm
3109-SIP18H
[LA4708]
Features
. High power: supports total output of 30 W + 30 W
. (VCC = 13.2 V, THD = 30%, RL = 4 Ω)
Supports RL = 2 Ω (PO = 30 W when VCC = 13.2 V,
. THD = 10%)
Designed for excellent sound quality
(fL < 10 Hz, fH = 130 kHz)
. NF capacitorless
. Any on time settable by external capacitor
. Less pop noise
. Standby switch circuit on chip (microprocessor supported)
. Various protectors on chip
(output-to-ground short/output-to-VCC short/
load short/overvoltage/thermal shutdown circuit)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Surge supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max 1
VCC max 2
VCC surge
IO peak
Pd max
Topr
Tstg
Conditions
No signal, t = 60 s
t % 0.2 s, single giant pulse
Per channel
Arbitrarily large heat sink
* Set VCC, RL in a range that does not exceed Pd max = 37.5 W
SANYO : SIP18H
Ratings
24
16
50
4.5
37.5
–35 to +85
–40 to +150
Unit
V
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
93096HA(II)/13096HA(II) No.5245-1/9
1 page  
LA4708
Features of IC Inside and Usage Notes
Standby function
. Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5 V or more to this pin through an
. external resistor (R1).
If voltage in excess of 13.2 V is to be applied to the standby switch, calculate the value of R1 using the following formula so
that the current flowing into pin 5 is 500 µA or less:
Applied voltage − 1.4 V
R1 =
500 µA
– 10 kΩ
500 µA or less
Pin 5 Equivalent
circuit internal IC
Standby
About 1.4 V
applied voltage (2VBE)
Mute function
. Pin 6 is the connector for the capacitor that determines the on time in order to prevent pop noise. By grounding this pin, the
amplifier can implement mute operation. In this case, the recovery time depends on C3.
How to reduce pop noise
. Although the LA4708 reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2 µF can be connected between pin 8
and the pre-GND to further reduce pop noise that occurs when power supply is turned on/off (standby switch on/off). The larger
the capacitance, the lower the frequency of pop noise, and it is barely audible, but sound residue of the sound signal is liable to
linger when power is turned off. Pin 8 is the bias pin for the output amplifier and normally is left open.
Protectors
. In an output-to-ground and output-to-VCC short protector system configuration, if a DC resistor is connected between amplifier
output pin and GND, the protector may operate, causing the amplifier not to start operating. Therefore, as a general rule, no DC
. resistor should be connected between amplifier output pin and GND.
In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4708 has a thermal shutdown
protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180°C due to inadequate heat dissipation, the
. thermal shutdown protector will operate to control the output gradually into attenuation.
Also be fully careful of handling other protectors built in the LA4708.
Miscellaneous
. Since pins 1 and 9, which are unused, are connected internally, they must be left open.
. Pin 10 is an NC pin (no internal connection).
No.5245 -5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA4708.PDF ] | |
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