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L6377 Datasheet(PDF) 9 Page - STMicroelectronics |
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L6377 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 16 page L6377 Over current operation 9/16 7 Over current operation In order to implement a short circuit protection the output power MOS is driven in linear mode to limit the output current to the Isc value. This Isc limit is externally settable by means of an external 1/4 W resistor connected from Rsc pin and GND. The value of the resistor must be chosen according to the following formula: Isc (A) = 5/Rsc (kΩ) with 5 < Rsc < 30 (kΩ) For Rsc < 5 (kΩ) Isc is limited to Isc = 1.1 A (typical value). This condition (current limited to the Isc value) lasts for a Ton time interval, that can be set by means of a capacitor (CDON) connected to the ON DELAY pin according to the following formula: tON = 1.28 µs/pF for 50 pF < CDON < 2 nF After the ton interval has expired the output power MOS is switched off for the tOFF time interval with: tOFF = 64*tON. 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 |
Similar Part No. - L6377_08 |
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Similar Description - L6377_08 |
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