Moteur de recherche de fiches techniques de composants électroniques
Selected language     French  ▼

Delete All


Preview PDF Download HTML

LA4708 Datasheet(Fiches technique) 5 Page - Sanyo Semicon Device

Numéro de pièce LA4708
Description  20 W 2-channel BTL AF Power Amplifier for Car Stereos
Télécharger  9 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricant  SANYO [Sanyo Semicon Device]
Site Internet
Logo SANYO - Sanyo Semicon Device

LA4708 Datasheet(HTML) 5 Page - Sanyo Semicon Device

  LA4708 Datenblatt HTML 1Page - Sanyo Semicon Device LA4708 Datenblatt HTML 2Page - Sanyo Semicon Device LA4708 Datenblatt HTML 3Page - Sanyo Semicon Device LA4708 Datenblatt HTML 4Page - Sanyo Semicon Device LA4708 Datasheet HTML 5Page - Sanyo Semicon Device LA4708 Datenblatt HTML 6Page - Sanyo Semicon Device LA4708 Datenblatt HTML 7Page - Sanyo Semicon Device LA4708 Datenblatt HTML 8Page - Sanyo Semicon Device LA4708 Datenblatt HTML 9Page - Sanyo Semicon Device  
Zoom Inzoom in Zoom Outzoom out
 5 / 9 page
background image
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:
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.
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.
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).
R1 =
Applied voltage − 1.4 V
–10 k
500 µA
applied voltage
500 µA or less
About 1.4 V
Pin 5 Equivalent
circuit internal IC
No.5245 -5/9

Html Pages

1  2  3  4  5  6  7  8  9 

Datasheet Download

Go To PDF Page

Lien URL

Privacy Policy
AllDATASHEET vous a-t-il été utile ?   [ DONATE ]  

À propos de Alldatasheet   |   Publicit   |   Contactez-nous   |   Politique de confidentialit   |   Echange de liens   |   Manufacturer List
All Rights Reserved©

Mirror Sites
English :  |   English :  |   Chinese :  |   German :  |   Japanese :
Russian :  |   Korean :  |   Spanish :  |   French :  |   Italian :
Portuguese :  |   Polish :  |   Vietnamese :