TDA7493 datasheet(17/30 Pages) STMICROELECTRONICS

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TDA7493

Applications information

Doc ID 14570 Rev 6

17/30

5.7

Protection function

The TDA7493 has four types of protection: overvoltage (OV), undervoltage (UV), thermal

(OT) and short circuit (SC):

overvoltage protection (OVP) for the supply VCC > 6 V

undervoltage protection (UVP) for the supply VCC < 3 V

thermal protection (OTP) for the junction temperature Tj > 155 °C

short-circuit protection (SCP) across the load (tested at VCC = 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:

input impedance is given by 2 * Rin,

cut-off frequency of the input filter is given by

fc = 1 / (2 *

π * Cin / 2 * 2 * Rin) = 1 / (2 * π * Cin * Rin).

Typically, Rin = 30 k

Ω and Cin > 330 nF to get a cut-off frequency less than 20 Hz.

Figure 11.

Differential input application

Cin

TDA7493

Input stage

OUTP

OUTN

INP

INN

Rin

Rfb

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