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TDA2004A 数据表(PDF) 8 Page - STMicroelectronics |
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TDA2004A 数据表(HTML) 8 Page - STMicroelectronics |
8 / 10 page BUILT–IN PROTECTION SYSTEMS LOAD DUMP VOLTAGE SURGE The TDA2004A has a circuit which enables it to wi- thstand a voltage pulse train, on pin 9, of the type shown in Fig. 19. If the supply voltage peaks to more than 40 V, then an LC filter must be insertedbetween the supply and pin 9, in order to assure that the pulses at pin 9 will be held within the limits shown. A suggested LC network is shown in Fig. 18. With this network, a train of pulsewith amplitude up to 120 V and with of 2 ms can be applied to point A. This type of protection is ON when the supply voltage (pulse or DC) exceeds18 V. For this reason the ma- ximum operating supply voltage is 18 V. SHORT CIRCUIT (AC conditions) The TDA2004A can withstand an accidental short- circuit from the output to ground caused by a wrong connection during normal working. POLARITY INVERSION High current (up to 10 A) can be handled by the de- vice with no damage for a longer period than the blow-out time of a quick 2 A fuse (normally connec- ted in series with the supply). This feature is added to avoid destruction, if during fitting to the car, a mi- stake on the connection of the supply is made. OPEN GROUND When the ratio is the ON condition and the ground is accidentally opened, a standard audio amplifier will be damaged. On the TDA2004A protection dio- des are included to avoid any damage. INDUCTIVE LOAD A protection diode is provided to allow use of the TDA2004A with inductive loads. DC VOLTAGE The maximum operating DC voltage on the TDA2004A is 18 V. However the device can withstand a DC voltage up to 28 V withno damage. This could occur during win- ter if two batteries are series connected to crank the engine. 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 excessive ambient temperature can be easily withstood. 2) the heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive jun- ction temperature ; all that happens is the PO (and therefore Ptot)and Id are reduced. The maximum allowable power dissipationdepends upon the size of the external heatsink(i.e. its thermal resistance) ; fig. 15 shown this dissipable power as a function of ambient temperature for different ther- mal resistance. Figure 18. Figure 19. TDA2004A 8/10 |
类似零件编号 - TDA2004A |
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类似说明 - TDA2004A |
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