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TDA2030 Datasheet(PDF) 9 Page - STMicroelectronics |
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TDA2030 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 12 page  SHORT CIRCUIT PROTECTION The TDA2030 has an original circuit which limits the current of the output transistors. Fig. 18 shows that the maximum output current is a function of the collector emitter voltage; hence the output transis- tors work within their safe operating area (Fig. 2). 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. Fi g ure 1 8. M aximum ou t pu t c urr en t vs. voltage [VCEsat] across each output transistor Figure 19. Safe operating area and collector characteristics of the protected power transistor THERMAL SHUT-DOWN 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 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 increases up to 150 °C, the thermal shut-down simply reduces the power dissipation at the current consumption. The maximum allowable power dissipation de- pends upon the size of the external heatsink (i.e. its thermal resistance); fig. 22 shows this dissipable power as a function of ambient temperature for different thermal resistance. TDA2030 9/12 |
Similar Part No. - TDA2030_98 |
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Similar Description - TDA2030_98 |
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