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PI2001 Datasheet(PDF) 7 Page - Vicor Corporation |
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PI2001 Datasheet(HTML) 7 Page - Vicor Corporation |
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7 / 23 page  Forward Voltage Comparator: FWD The FWD comparator detects when a forward current condition exists and SP is 6mV(typical) positive with respect to SN. When SP-SN is less than 6mV, the FWD comparator will assert the Fault flag to report a fault condition indicative of a light load or “load not present” condition or possible shorted MOSFET. Forward Over Current Comparator: FOC The FOC comparator indicates an excessive forward current condition when SP is 66mV(typical) higher than SN. When the GATE output voltage is greater than 77% of the regulated gate voltage and SP-SN is higher than 66mV, the PI2001 will initiate a fault condition via the FT pin. Slave: In high current applications multiple parallel MOSFETs may be needed for a single ORing function. Driving multiple MOSFETs with one controller will increase the loading on the GATE pin and the gate connection parasitic thereby impacting the reverse turn-off response. The Slave function synchronizes multiple controllers so that one, or more, of the paralleled MOSFETs will have its own local driving source. In this configuration, one controller will be designated as the master and it will control the response of the slaved controllers. When the controller is configured in “Master Mode”, by connecting the BK to ground, the SL will be an output having the same signal characteristics as the GATE signal. In this configuration, the SL output is capable of driving up to ten controllers, configured in “Slave Mode”, through their corresponding SL pins. Logic high for the SL pin is limited to 5.5V (max). When the BK pin is tied to VC, the controller is configured in “Slave Mode” and the SL pin becomes an input. The Gate driver section and reverse current section are the only active circuits in the slave controller while the master performs the diagnostics and gate drive control. VC and Internal Voltage Regulator: The PI2001 has a separate input (VC) that provides power to the control circuitry and the gate driver. An internal regulator clamps the VC voltage to 15.5V. Picor Corporation • picorpower.com PI2001 Rev 1.0 Page 7 of 23 For high side applications, the VC input should be high enough above the bus voltage to properly enhance the external N-channel MOSFET. In a low side drive application VC may be tied to the bus voltage through a resistor. The internal regulator circuit has a comparator to monitor VC voltage and initiates a FAULT condition when VC is lower than the VC Under-Voltage Threshold. UV: The Under-Voltage (UV) input trip point can be programmed through an external resistor divider to monitor the input voltage. The UV comparator initiates a fault condition and pulls the FT pin low when UV falls below the Under-Voltage Falling Threshold. The GATE pin does not respond to a UV fault. If the PI2001 is configured in a floating application, where the GND pin is connected to the input voltage, the UV pin cannot detect the input voltage. In this case, the UV pin should be disabled by connecting it to the VC pin. OV : The Over Voltage (OV) input trip point can be programmed through an external resistor divider to monitor the input voltage. The OV comparator initiates a fault condition and pulls the FT pin low when OV rises above the Over-Voltage Rising Threshold. The GATE pin does not respond to an OV fault. If the PI2001 is configured in a floating application, where the GND pin is connected to the input voltage, the OV pin cannot detect the input voltage. In this case, the OV pin should be disabled by connecting it to the GND pin. Over-Temperature Detection: The internal Over-Temperature block monitors the junction temperature of the controller. The Over- Temperature threshold is set to 160 °C with -10°C of hysteresis. When the controller temperature exceeds this threshold, the Over-Temperature circuit initiates a fault condition and pulls the FT pin low. By maintaining proper thermal matching between the controller and the power MOSFET, this function can be used to protect the ORing device from thermal runaway conditions. The GATE pin does not respond to an Over-Temperature fault. Gate Driver: The gate driver (GATE) output is configured to drive an external N-channel MOSFET. In the high state, the gate driver applies a 1mA current source to the MOSFET gate and regulates the voltage to 9.5V typical (VG-CLMP) above the SP pin voltage (VSP) when the VC input voltage is higher than VSP plus VG-CLMP. Otherwise the gate voltage (VG) to VSP will |
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