Moteur de recherche de fiches techniques de composants électroniques
Selected language     French  ▼
Nom de la pièce
         Description


LA4555 Datasheet(Fiches technique) 4 Page - Sanyo Semicon Device

Numéro de pièce LA4555
Description  2-Channel AF Power Amplifier for Radio, Tape Recorder Use
Télécharger  10 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricant  SANYO [Sanyo Semicon Device]
Site Internet  http://www.ssdc-jp.com/eng/
Logo 

 
 4 page
background image
LA4555
No.1697–4/10
Continued from preceding page.
C7 (C8) : Output capacitor. The low cutoff frequency is determined by the following formula.
fL : Low cutoff frequency
RL : Load resistance
To make the low frequency response in the bridge amplifier mode identical with that in the stereo mode, the
capacitor value must be doubled.
C9 :
Decoupling capacitor. Used for the ripple filter. Since the rejection effect is saturated at a certain capacitor
value, it is meaningless to increase the capacitor value more than needed. This capacitor, being also used for
the time constant of the muting circuit, affects the starting time.
C10 :
Power source capacitor.
Application Circuits
Voltage gain adjust
· Stereo mode
The voltage gain is determined by on-chip resistor R1 (R2) and external feedback resistor Rf as follows :
Any voltage gain can be obtained by external
resistor Rf.
· Bridge amplifier 1 mode
Since point A is at the same potential as Vi and point B is a virtual GND point,
Assuming R2=R4=50
Ω, R1=R3=20kΩ and Rf1=Rf2, the voltage gain is obtained by :
· Bridge amplifier 2 mode
The CH1 is a noninverting amplifer and the CH2 is an inverting amplifier. The total voltage gain, being apparently
higher than that of the CH1 by 6dB, is approximately calculated by the following formula.
VG=20log R2/R1+6 (dB)
To reduce the voltage gain, Rf is connected and the following formula is used.
VG=20log R2/Rf+R1+6 (dB)
fL=
1
2
πC7RL
VG=20 log
[dB]
R1
Rf1+R2
Vo1
Vi
R1
R2+R4+Rf1+Rf2
VG=20 log
[dB]
R1
Rf1+R2
Vo2
Vi
–R3
R2+R4+Rf1+Rf2
VG=20 log
=20log
[dB]
Vo
Vi
R1+R3
R2+R4+Rf1+Rf2
Vo = Vo1 – Vo2 =
Vi
R1+R3
R2+R4+Rf1+Rf2




Html Pages

1  2  3  4  5  6  7  8  9  10 


Datasheet Download



Numéro de composants électroniques

Numéro de pièceDescription des composantsHtml ViewFabricant
LA45502-Channel AF Power Amp for Radio Tape Recorder Use 1 2 3 4 5 MoreSanyo Semicon Device
LA45572-Channel AF Power Amp for Radio Tape Recorder Use 1 2 3 4 5 MoreSanyo Semicon Device
LA41252-CHANNEL AF POWER AMP FOR RADIO TAPE RECORDER 1 Sanyo Semicon Device
LA41262-CHANNEL AF POWER AMP FOR RADIO TAPE RECORDER 1 Sanyo Semicon Device
LA4636For General Audio Use 11 W 2-Channel BTL AF Power Amplifier 1 2 3 Sanyo Semicon Device
LA42822-Channel 10 W AF Power Amplifier for Use in Home Stereo TV Applications 1 2 3 4 5 MoreSanyo Semicon Device
NTE1472Integrated Circuit Audio Power Amplifier 1W for Tape Recorder 1 2 NTE Electronics
LA4635AFor General Audio Use 2-Channel BTL AF Power Amplifier 1 2 3 Sanyo Semicon Device
LA41832.3 W 2-Channel AF Power Amplifier for Radio Cassette Players 1 2 3 4 5 MoreSanyo Semicon Device
LA45052-CHANNEL AF POWER AMPLIFIER FOR RADIO CASSETTE 15V 1 Sanyo Semicon Device

Lien URL

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

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Favoris   |   Echange de liens   |   Fabricants
All Rights Reserved © Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl