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PI2123-00-LGIZ Datasheet(PDF) 7 Page - Vicor Corporation |
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PI2123-00-LGIZ Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 20 page Forward Voltage Comparator: FWD The FWD comparator detects when a forward current condition exists and SP is 6mV 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 FET is in the on-state and SP- SN is higher than 66mV (typical) the PI2123 will initiate a fault condition via the FT pin. Slave: In high current applications that exceed the single PI2123 current handling capability, multiple PI2123’s can be paralleled and synchronized by using the slave function. The Slave function synchronizes multiple PI2123’s together and allows for localized control of each paralleled MOSFET. One PI2123 will be designated as the master and it will control the response of the slaved PI2123’s. When the PI2123 is configured in the “Master Mode” by connecting the BK to ground, the SL will be an output having the same signal characteristics as the internal Gate Driver. In this configuration, the SL output is capable of driving up to ten PI2123’s, 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 PI2123 becomes a slave and the SL pin will be an input. The internal Gate driver section and reverse current section are the only active circuits in the slaved PI2123 while the master performs the diagnostics and gate drive control. VC and Internal Voltage Regulator: The PI2123 has a separate input (VC) to provides power to the controller circuitry and the internal gate driver. An internal regulator clamps the VC voltage to 15.5V. For high side applications, the VC input should be at least 6V above the bus voltage (Vin) to properly enhance the internal N-channel MOSFET. The internal regulator circuit has a comparator to monitor the 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. If the PI2123 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. If the PI2123 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 control 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. 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 • Forward Low Current • Over-Temperature • Input Under-Voltage • Input Over-Voltage • VC pin Under-Voltage A gate voltage detector prevents FOC or FWD from initiating a fault when the MOSFET is in an OFF condition. The only fault condition that initiates gate turn-off of the MOSFET (as well as a fault flag signal) is when the reverse current fault conditions are met. All other fault conditions issue only a fault flag signal via the Picor Corporation • picorpower.com PI2123 Rev 1.0 Page 7 of 20 |
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