Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF HTML

TDA7854 Datasheet(PDF) 9 Page - STMicroelectronics

Part No. TDA7854
Description  4 x 47W MOSFET quad bridge power amplifier
Download  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo 

TDA7854 Datasheet(HTML) 9 Page - STMicroelectronics

 
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
TDA7854
Application hints
9/12
4
Application hints
4.1
SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients.To conveniently serve both needs, its minimum recommended value
is 10
μF.
4.2
Input stage
The TDA7854's inputs are ground-compatible and can stand very high input signals (±
8Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1
μF) is adopted, the low frequency cut-off
will amount to 16 Hz.
4.3
Stand-by and muting
R-C cells have always to be used in order to smooth down the transitions for preventing any
audible transient noise.
About stand-by, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5V/ms.
A direct connection to Vs of these two pins is admissible but a 470kOhm equivalent
resistance should be present between the power supply and muting and stand-by pins.
4.4
Heatsink definition
Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be
deduced from Figure 4, which reports the simulated power dissipation when real
music/speech programmes are played out. Noise with gaussian-distributed amplitude was
employed for this simulation. Based on that, frequent clipping occurrence (worst-case) will
cause Pdiss = 26W. Assuming Tamb = 70°C and TCHIP = 150°C as boundary conditions, the
heatsink's thermal resistance should be approximately 2°C/W. This would avoid any thermal
shutdown occurrence even after long-term and full-volume operation.
Figure 4.
Power dissipation vs. output power (RL = 4Ω, audio program simulation)
5
10
15
20
25
30
0123456
V
s = 14.4 V
R
L = 4 x 4 Ω
GAUSSIAN NOISE
CLIP START
P
tot (W)
P
o (W)
AC00036


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : 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  |   Vietnamese : Alldatasheet.vn