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TDA2006H データシート(PDF) 9 Page - STMicroelectronics |
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TDA2006H データシート(HTML) 9 Page - STMicroelectronics |
9 / 12 page SHORT CIRCUIT PROTECTION Figure 18 : Maximum Output Current versus Voltage VCE (sat) accross each Out- put Transistor Figure 19 : Safe Operating Area and Collector Characteristics of the Protected Power Transistor The TDA2006 has an original circuit which limits the current of the output transistors. Figure 18 shows that the maximum output current is a func- tion of the collector emitter voltage ; hence the output transistors work within their safe operating area (Figure 19). This function can therefore be considered as being peak power limiting rather than simple current lim- iting. It reduces the possibility that the device gets dam- aged during an accidental short circuit from AC output to ground. THERMAL SHUT DOWN The presence of a thermal limiting circuit offers the following advantages : 1) an overload on the output (even if it is permanent), or an abo ve l imi t ambien t temperature can be easily supported 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 damage 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 con- sumption. The maximum allowable power dissipation de- pends upon the size of the external heatsink (i.e. its thermal resistance) ; Figure 22 shows the dissi- pable power as a function of ambient temperature for different thermal resistances. Figure 20 : Output Power and Drain Current ver- sus Case Temlperature (RL =4 Ω) Figure 21 : Output Power and Drain Current ver- sus Case Temlperature (RL =8 Ω) TDA2006 9/12 |
同様の部品番号 - TDA2006H |
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同様の説明 - TDA2006H |
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