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TDA7370BV Datasheet(PDF) 12 Page - STMicroelectronics |
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TDA7370BV Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 17 page  Polarity Inversion High current (up to 10A) can be handled by the device with no damage for a longer period than the blow-out time of a quick 2A fuse (normally connected in series with the supply). This fea- tures is added to avoid destruction, if during fitting to the car, a mistake on the connection of the supply is made. Open Ground When the radio is in the ON condition and the ground is accidentally opened, a standard audio amplifier will be damaged. On the TDA7370B pro- tection diodes are included to avoid any damage. Inductive Load A protection diode is provided to allow use of the TDA7370B with inductive loads. DC Voltage The maximum operating DC voltage for the TDA7370B is 18V. However the device can withstand a DC voltage up to 28V with no damage. This could occur dur- ing winter 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 perma- nent), 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 case of excessive junction temperature: all happens is that Po (and therefore Ptot) and Id are re- duced. The maximum allowable power dissipation de- pends upon the size of the external heatsink (i.e. its thermal resistance); Fig. 23 shows the dissi- pable power as a function of ambient temperature for different thermal resistance. Loudspeaker Protection The TDA7370B guarantees safe operations even for the loudspeaker in case of accidental shortcircuit. Whenever a single OUT to GND, OUT to VS short circuit occurs both the outputs are switched OFF so limiting dangerous DC current flowing through the loudspeaker. Figure 23: Maximum Allowable Power Dissipation vs. Ambient Temperature TDA7370B 12/17 Obsolete Product(s) - Obsolete Product(s) |
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