TDA7493 Datasheet, PDF (17/30 Pages) STMicroelectronics – 3-watt + 3-watt dual BTL class-D audio amplifier

TDA7493
Applications information
5.7
Protection function
The TDA7493 has four types of protection: overvoltage (OV), undervoltage (UV), thermal
(OT) and short circuit (SC):
z overvoltage protection (OVP) for the supply V_CC > 6 V
z undervoltage protection (UVP) for the supply V_CC < 3 V
z thermal protection (OTP) for the junction temperature Tj > 155 °C
z short-circuit protection (SCP) across the load (tested at V_CC = 5.0 V).
When any of the above protection becomes active, the output goes to a high-impedance
state. The device remains in this state until the condition is cleared or rectified, when the
circuit restarts again.
5.8
Differential input
The TDA7493 can be used with either differential or single-ended inputs. In either case, the
device must be AC coupled to the audio source.
To use the device with a differential source, connect the positive lead from the audio source
to the INP input and the negative lead to the INN input as shown in Figure 11. The
differential input stage of the amplifier minimizes the common mode noise effectively.
In the differential input application:
z input impedance is given by 2 * Rin,
z cut-off frequency of the input filter is given by
f_c = 1 / (2 * π * Cin / 2 * 2 * Rin) = 1 / (2 * π * Cin * Rin).
Typically, Rin = 30 kΩ and Cin > 330 nF to get a cut-off frequency less than 20 Hz.
Figure 11. Differential input application
TDA7493
Rfb
Cin
OUTP
INP
+
Rin
Cin
OUTN
INN
-
Rin
Rfb
Input stage
Doc ID 14570 Rev 6
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