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VIPER22A Datasheet(PDF) 2 Page - STMicroelectronics |
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VIPER22A Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 15 page VIPer22ADIP / VIPer22AS 2/15 PIN FUNCTION CURRENT AND VOLTAGE CONVENTIONS CONNECTION DIAGRAM Name Function VDD Power supply of the control circuits. Also provides a charging current during start up thanks to a high voltage current source connected to the drain. For this purpose, an hysteresis comparator monitors the VDD voltage and provides two thresholds: - VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns off the start up current source. - VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on the start up current source. SOURCE Power MOSFET source and circuit ground reference. DRAIN Power MOSFET drain. Also used by the internal high voltage current source during start up phase for charging the external VDD capacitor. FB Feedback input. The useful voltage range extends from 0V to 1V, and defines the peak drain MOSFET current. The current limitation, which corresponds to the maximum drain current, is obtained for a FB pin shorted to the SOURCE pin. IDD ID IFB VDD VFB VD FB VDD DRAIN SOURCE CONTROL VIPer22A 1 2 3 4 DRAIN DRAIN DRAIN DRAIN 8 7 6 5 DRAIN DRAIN DRAIN DRAIN 1 2 3 4 8 7 6 5 FB VDD SOURCE FB VDD SOURCE SOURCE SOURCE SO-8 DIP8 |
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