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TDA8947J Datasheet(Fiches technique) 8 Page - NXP Semiconductors

Numéro de pièce TDA8947J
Description  4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)
Télécharger  24 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TDA8947J
4-channel audio amplifier
Preliminary data
Rev. 01 — 06 February 2004
8 of 24
9397 750 10779
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.5 Built-in protection circuits
The TDA8947J contains two types of detection sensors: one measures local
temperatures of the power stages and one measures the global chip temperature. At
a local temperature of approximately 185
°C or a global temperature of approximately
150
°C, this detection circuit switches off the power stages for 2 ms. High impedance
of the outputs is the result. After this time period the power stages switch on
automatically and the detection will take place again; still a too high temperature
switches off the power stages immediately. This protects the TDA8947J against
shorts to ground, to the supply voltage and across the load, and against too high chip
temperatures.
The protection will only be activated when necessary, so even during a short-circuit
condition, a certain amount of (pulsed) current will still be flowing through the short,
just as much as the power stage can handle without exceeding the critical
temperature level.
9.
Limiting values
[1]
The amplifier can deliver output power with non clipping output signals into nominal loads as long as
the ratings of the IC are not exceeded.
10. Thermal characteristics
Table 6:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
operating
−0.3
+26
V
no (clipping) signal
[1]
−0.3
+28
V
VI
input voltage
−0.3
VCC + 0.3 V
IORM
repetitive peak output
current
-4
A
Tstg
storage temperature
non-operating
−55
+150
°C
Tamb
ambient temperature
−40
+85
°C
Ptot
total power dissipation
-
69
W
VCC(sc)
supply voltage to guarantee
short-circuit protection
-24
V
Table 7:
Thermal characteristics
Symbol Parameter
Conditions
Value
Unit
Rth(j-a)
thermal resistance from
junction to ambient
in free air
40
K/W
Rth(j-c)
thermal resistance from
junction to case
all channels driven
1.3
K/W




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