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VN220011Y Datasheet(PDF) 4 Page - STMicroelectronics |
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VN220011Y Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 10 page 4/10 VN220 / VN220(011Y) / VN220(012Y) 1 FUNCTIONAL DESCRIPTIO N The VN220 provides protection against a short circuit on the output and senses the output current to detect an open load. When one of these two faults is detected the diagnostic output is taken low. OPEN LOAD DETECTIO N When the device is first turned on, only the auxiliary DMOS device is turned on. If the load current remains below 9mA (typical), the open load signal is active and the diagnostic output is low. When the load current goes above 9 mA the open load detection becomes inactive and the diagnostic goes high. When the load current exceeds 300 mA, the main DMOS (50 m Ω) turns on. When the load current drops below 240 mA, the main DMOS is turned off but no open load signal is generated and the auxiliary DMOS is still turned on. If the load current drops below 9mA, again the open load signal is generated and the diagnostic output goes low. SHORT CIRCUIT PROTECTION Short circuit protection is achieved using the fast response of the thermal shut-down circuit. The only current limitation in this condition is the saturation current of the DMOS devices and the external wiring resistance. Under this condition the device can survive a short circuit up to 30V across DMOS devices. THERMAL PROTECTION The device is internally protected against over temperature by the thermal protection circuit. When the device junction temperature exceeds the protection limit, the output is latched off. To turn on the output again, the input signal must be taken low to reset the latch, then high again to turn on the output. If the junction temperature has not yet cooled below the lower limit set by the thermal sensing hysteresis, the device will remain latched off. NOTE: When an open load defect appears (or disappears) the state of the diagnostic output changes only after the filtering time (tol). See open load waveform diagrams. |
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