TDA2050 datasheet(9/13 Pages) STMICROELECTRONICS

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SHORT CIRCUIT PROTECTION

The TDA 2050 has an original circuit which limits

the current of the output transistors. The maxi-

mum output current is a function of the collector

emitter voltage; hence the output transistors work

within their safe operating area. This function can

therefore be considered as being peak power lim-

iting rather than simple current limiting.

It reduces the possibility that the device gets

damaged during an accidental short circuit from

AC output to ground.

THERMAL SHUTDOWN

The presence of a thermal limiting circuit offers

the following advantages:

1)An overload on the output (even if it is perma-

nent), or an above limit ambient temperature

can be easily tolerated since the Tj cannot be

higher than 150

°C.

2)The heatsink can have a smaller factor of

safety compared with that of a conventional

circuit. There is no possibility of device dam-

age due to high junction temperature. If for

any reason, the junction temperature in-

creases up to 150

°C, the thermal shutdown

simply reduces the power dissipation and the

current consumption.

The maximum allowable power dissipation de-

pends upon the thermal resistance junction-ambi-

Figure 13: Supply Voltage Rejection vs. Fre-

quency (Single supply) for Different

values of C2 (circuit of fig. 3)

Figure 14: Supply Voltage Rejection vs. Fre-

quency (Single supply) for Different

values of C2 (circuit of fig. 3)

Figure 15: Total Power Dissipation and Effi-

ciency vs. Output Power

Figure 16: Total Power Dissipation and Effi-

ciency vs. Output Power

TDA2050

9/13

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