TDA8941P Datasheet, PDF (6/21 Pages) NXP Semiconductors – 1.5 W mono Bridge Tied Load BTL audio amplifier

Philips Semiconductors
TDA8941P
1.5 W mono BTL audio amplifier
8.5 Built-in protection circuits
The TDA8941P contains two types of protection circuits, i.e. short-circuit and thermal
shutdown.
8.5.1 Short-circuit protection
Short-circuit to ground or supply line — This is detected by a so-called ‘missing
current’ detection circuit which measures the current in the positive supply line and
the current in the ground line. A difference between both currents larger than 0.4 A,
switches the power stage to standby mode (high impedance).
Short-circuit across the load — This is detected by an absolute-current
measurement. An absolute-current larger than 2 A, switches the power stage to
standby mode (high impedance).
8.5.2 Thermal shutdown protection
The junction temperature is measured by a temperature sensor; at a junction
temperature of approximately 150 °C this detection circuit switches the power stage
to standby mode (high impedance).
9. Limiting values
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
V_CC
supply voltage
no signal
−0.3
operating
−0.3
V_I
input voltage
−0.3
I_ORM
T_stg
T_amb
repetitive peak output current
-
storage temperature
non-operating
−55
operating ambient
−40
temperature
P_tot
total power dissipation
-
V_CC(sc)
supply voltage to guarantee
-
short-circuit protection
Max
Unit
+25
V
+18
V
V_CC + 0.3 V
2
A
+150
°C
+85
°C
1.25
W
12
V
10. Thermal characteristics
Table 6: Thermal characteristics
Symbol Parameter
R_th(j-a)
thermal resistance from junction to ambient
Conditions
in free air
Value Unit
100 K/W
9397 750 06864
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
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