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QPI-10LZ-01 Datasheet(PDF) 4 Page - Vicor Corporation |
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QPI-10LZ-01 Datasheet(HTML) 4 Page - Vicor Corporation |
4 / 8 page Picor Corporation • www.picorpower.com QPI-10 Data Sheet Rev. 1.4 Page 4 of 8 Note: If the CE Capacitor is used, a maximum value of 1 k should be used for RUVEN to prevent damaging the enabling diodes. Applications Information – Hot-Swap The QPI-10’s high-temperature rating of 6 A provides filtering for up to 288 W of power from a 48 V bus with a 70°C PCB temperature. It is well suited for the 200 W per board limit in the PICMG ® 3.0. The 1.0” x 1.0” x 0.2” surface mount LGA package provides ease of manufacturing by eliminating through-hole assembly. The current derating curve, shown in Figure 5, should be used when the PCB temperature that the QPI-10 is mounted to exceeds 70°C. The hot-swap feature is created with an internal switch that controls the current path between BUS- and SW pins. The state of the switch can be on, off or in a current-control mode depending on the state of the control function. The QPI-10 has two signal pins that can be used to indicate the power-up status of the QPI-10. Both are active-low when power is not good. PWRGD1 is an opendrain that is referenced to the BUS- rail of the QPI- 10. PWRGD2 is an opendrain that is referenced to the QPI– rail, allowing it to directly control the Enable pin of the V•I Chip converter, without any kind of signal translation required. An example circuit of both options can be seen in Figures 8a and 8b. The QPI-10 is designed to have an under-voltage hysteretic range of 32 V to 34 V when the UVEN pin is tied to the BUS+ pin with no additional series resistance. The QPI-10 becomes enabled when the input voltage exceeds 34 V and continues to work down to 32 V before being disabled. The over-voltage hysteretic range is designed to be 72 V to 76 V when the OV pin is tied to the BUS+ pin without a trimming resistor in series. The QPI-10 remains functioning until the OV surpasses 76 V, where it will shutdown until the input voltage falls below 72 V. External resistors can be added to trim the UV and OV trip points higher. The graph in Figure 6 shows the trimming effect for a range of external series resistors. The equations in Figure 7 can be used to calculate the required series resistor for increasing the preprogrammed trip points. An external capacitor CE, shown in Figures 8a and 8b, will provide the required hold-up filtering during the AdvancedTCA‘s 5 ms, zero-volt BUS transient event. This filtering will enable the Power Good state of the QPI-10 to remain unchanged during this transient, provided there is enough hold-up capacitance and input energy to maintain the power converter’s operation. Without this capacitor, the QPI-10 would detect an undervoltage fault and shut off its internal pass switch. The fault would also initiate a restart of the hot-swap control and would require up to 20 ms to turn back on its internal switch. QPI-10 Current Derating Curve 0.00 2.00 4.00 6.00 8.00 020 40 60 80 100 Temperature °C Figure 5 – QPI-10 current derating curve over temperature. UV/OV Trim 30.00 40.00 50.00 60.00 70.00 80.00 90.00 0 5000 10000 15000 20000 25000 30000 Series Resistor OV-High OV-Low UV-High UV-Low Figure 6 – Trimming UV/OV with an external series resistor Figure 7 – UVEN and OV resistor equations. UVEN LO =2.5 V(RUVEN + 108450) 8450 UVEN HI = 2.5 V + (RUVEN + 100K)(316µA) OV LO = 2.5 V + (ROV + 200K)(348µA) OV HI =2.5 V(ROV + 206800) 6800 |
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