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TDA2050H Fiches technique(PDF) 9 Page - STMicroelectronics |
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TDA2050H Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 13 page 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 |
Numéro de pièce similaire - TDA2050H |
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Description similaire - TDA2050H |
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