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PI2003-00-SOIG Datasheet(PDF) 5 Page - Vicor Corporation |
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PI2003-00-SOIG Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 16 page Functional Description: The PI2003 Cool-ORing controller IC is designed to drive single or paralleled N-channel MOSFETs in Active ORing applications, and optimized for -48V applications. The PI2003 used with an external MOSFET can function as an ideal ORing diode in low side of a redundant power system, significantly reducing power dissipation and eliminating the need for heatsinking. An N-channel MOSFET in the conduction path offers extremely low on-resistance resulting in a dramatic reduction of power dissipation versus the performance of a diode used in conventional ORing applications. This can allow for the elimination of complex heat sinking and other thermal management requirements. While the gate remains above the gate threshold voltage it will allow current to flow in the forward and reverse direction. Ideal ORing applications do not allow for reverse current flow, so the controller detect reverse current caused by input power source failures and turn off the the MOSFET as quickly as possible. Once the gate voltage falls below the gate threshold, the MOSFET is off and the body diode will be reverse biased preventing reverse current flow and subsequent excessive voltage droop on the redundant bus. During forward over-current conditions the controller maintains gate drive to keep the MOSFET forward drop and power dissipation as low as possible. While conventional ORing solutions using diodes offer no protection against forward over-current conditions. The PI2003 will provide an active-low fault flag to the system via the FT pin. The fault flag is also issued during the reverse current condition, and light load or shorted MOSFET conditions. Differential Amplifier: The PI2003 integrates a high-speed low offset voltage differential amplifier to sense the difference between the Sense Positive (SP) pin voltage and Sense Negative (SN) pin voltage with high accuracy. The amplifier output is connected to three comparators: Reverse comparator, Forward comparator, and Forward over-current comparator. Reverse Current Comparator: RVS The reverse current comparator provides the most critical function in the controller, detecting negative voltage caused by reverse current. When the SN pin is 6mV higher than the SP pin, the reverse comparator will enable the gate discharge circuit and turn off the MOSFETs in typically 160ns. The reverse comparator has typically 3mV of hysteresis referenced to SP-SN. 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 150mV(typical) higher than SN. When the GATE output voltage is greater than 50% of the VC voltage and SP-SN is higher than 150mV, the PI2003 will initiate a fault condition via the FT pin. VC and Internal Voltage Regulator: The PI2003 has a separate input (VC) that provides power to the control circuitry and the gate driver. An internal regulator clamps the VC voltage (VVC-CLM ) to 11V. VC may be tied to a voltage higher than VVC-CLM through a resistor to limit VC current. 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, 7.15V 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 150µA current source to the MOSFET gate limited to the VC voltage. When a reverse current fault is initiated, the gate driver pulls the GATE pin low and discharges the FET gate with 4 Apeak capability. When the input source voltage is applied before the MOSFET is fully enhanced, a voltage greater than the Forward Over Current (FOC) Threshold may be present across the MOSFET. To avoid an erroneous FOC detection, a VGS detector blanks the FOC and FWD comparators from initiating a fault, until the GATE pin reaches 50% of VC pin voltage. Fault: The fault circuit output is an open collector with 40μs delay to prevent any false triggering. The FT pin will be pulled low when any of the following faults occur: • Reverse current • Forward Over-Current and VG > ½ VC Picor Corporation • picorpower.com PI2003 Rev 1.0 Page 5 of 16 |
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Similar Description - PI2003-00-SOIG |
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