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L6376 データシート(PDF) 7 Page - STMicroelectronics |
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L6376 データシート(HTML) 7 Page - STMicroelectronics |
7 / 12 page OVERTEMPERATURE PROTECTION (OVT) If the chip temperature exceeds Θlim (measured in a central position in the chip) the chip deactivates itself. The following actions are taken: • all the output stages are switched off; • the signal DIAG is activated (active low). Normal operation is resumed as soon as (typically after some seconds) the chip temperature moni- tored goes back below Θlim-ΘH. The different thresholds with hysteretic behavior assure that no intermittent conditions can be gen- erated. UNDERVOLTAGE PROTECTION (UV) The supply voltage is expected to range from 9.5V to 35V, even if its reference value is consid- ered to be 24V. In this range the device operates correctly. Below 9.5V the overall system has to be consid- ered not reliable. Consequently the supply voltage is monitored continuously and a signal, called UV, is internally generated and used. The signal is “on” as long as the supply voltage does not reach the upper internal threshold of the Vs comparator Vsth. The UV signal disappears above Vsth. Once the UV signal has been removed, the sup- ply voltage must decrease below the lower threshold (i.e. Vsth-Vshys) before it is turned on again. The hysteresis Vshys is provided to prevent inter- mittent operation of the device at low supply volt- ages that may have a superimposed ripple around the average value. The UV signal switches off the outputs, but has no effect on the creation of the reference voltages for the internal comparators, nor on the continu- ous operation of the charge-pump circuits. DIAGNOSTIC LOGIC The situations that are monitored and signalled with the DIAG output pin are: • current limit (OVC) in action; there are 4 indi- vidual current limiting circuits, one per each output; they limit the current that can be sunk from each output, to a typical value of 800mA, equal for all of them; • under voltage (UV); • over temperature protection (OVT). The diagnostic signal is transmitted via an open drain output (for ease of wired-or connection of several such signals) and a low level represents the presence of at least one of the monitored con- ditions, mentioned above. SHORT CIRCUIT OPERATION In order to allow normal operation of the other in- puts when one channel is in short cirtuit, an inno- vative non dissipative over current protection (pat- ent pending) is implemented in the device. OUTPUT CURRENT tON tON tOFF tOFF Time t<tON DIAG (active low) Time Short Circuit Short Circuit Isc Iout D94IN105 Figure 2: Short Circuit Operation Waveforms L6376 7/12 |
同様の部品番号 - L6376 |
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同様の説明 - L6376 |
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