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L6376D датащи(PDF) 11 Page - STMicroelectronics |
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L6376D датащи(HTML) 11 Page - STMicroelectronics |
11 / 18 page L6376 Short circuit operation 11/18 8 Short circuit operation In order to allow normal operation of the other inputs when one channel is in short cirtuit, an innovative non dissipative over current protection (patent pending) is implemented in the device. In this way, the temperature of the device is kept enough low to prevent the intervention of the thermal protection (in most of the cases) and so to avoid the shut down of the whole device. If a short circuit condition is present on one output, the current limiting circuit puts that channel in linear mode — sourcing the ISC current (typically 800 mA) — for a time period (tON) defined by an external capacitor (CDON connected to the ON DELAY pin). After that period, if the short circuit condition is still present the output is turned off for another time period (tOFF) defined by a second external capacitor (CDOFF connected to the OFF DELAY pin). When also this period is expired: ● if the short circuit condition is still present the output stays on for the tON period and the sequence starts again; ● if the short circuit condition is not present anymore the normal operation of the output is resumed. The tON and tOFF periods are completely independent and can be set from 64 µs to 15 µs, using external capacitors ranging from 50 pF to 15 nF (1.28 µs/pF). If the OFF DELAY pin is tied to ground (i.e. the CDOFF capacitor is not used) the tOFF time period is 64 times the tON period. The diagnostic output (DIAG) is active when the output is switched off, while it is not active when the output is on (i.e. during the tON period) even if in that period a short circuit condition is present. Figure 5. Short circuit operation waveforms OUTPUT CURRENT tON tON tOFF tOFF Time t<tON DIAG (active low) Time Short Circuit Short Circuit Isc Iout D94IN105 |
Аналогичный номер детали - L6376D |
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Аналогичное описание - L6376D |
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