TDA8943SF Datasheet, PDF (6/20 Pages) NXP Semiconductors – 6 W mono Bridge Tied Load BTL audio amplifier

Philips Semiconductors
TDA8943SF
6 W mono Bridge Tied Load (BTL) audio amplifier
8.4 Supply Voltage Ripple Rejection (SVRR)
The SVRR is measured with an electrolytic capacitor of 10 µF on pin SVR at a
bandwidth of 10 Hz to 80 kHz. Figure 12 on page 10 illustrates the SVRR as function
of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection
behaviour at the lower frequencies.
8.5 Built-in protection circuits
The TDA8943SF 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
I_ORM
T_stg
T_amb
input voltage
−0.3
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
7
W
18
V
9397 750 06865
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
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