TDA2050 Просмотр технического описания (PDF) - STMicroelectronics

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TDA2050

32W Hi-Fi AUDIO POWER AMPLIFIER

STMicroelectronics 

Figure 13: Supply Voltage Rejection vs. Fre-

quency (Single supply) for Different

values of C2 (circuit of fig. 3)

TDA2050

Figure 16: Total Power Dissipation and Effi-

ciency vs. Output Power

Figure 14: Supply Voltage Rejection vs. Fre-

quency (Single supply) for Different

values of C2 (circuit of fig. 3)

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.

Figure 15: Total Power Dissipation and Effi-

ciency vs. Output Power

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-

9/13

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