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QPI-10LZ-01 Datasheet(PDF) 6 Page - Vicor Corporation |
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QPI-10LZ-01 Datasheet(HTML) 6 Page - Vicor Corporation |
6 / 8 page Picor Corporation • www.picorpower.com QPI-10 Data Sheet Rev. 1.4 Page 6 of 8 Figure 9 – 470 µF capacitor @ 48 V. Figure 11 – 2 seconds short-circuit. Figure 12 – Start-up into short circuit. Figure 10 – 4700 µF capacitor @ 72 V. Start-up The following oscilloscope pictures show the hot-swap BUS- current, QPI- to BUS- voltage and PWRGD to BUS- output voltage of the QPI-10 during operation. Figures 9 and 10 are the QPI-10’s inrush characteristics under two load capacitance conditions. In Figure 9 a 470 µF capacitor required roughly 170 ms to completely charge from a 48 V bus voltage. The QPI-10 can drive large amounts of bulk capacitance to satisfy AdvancedTCA’s transient hold-up requirement (PICMG 3.0, 4.1.4.3) as shown in Figure 10 with a 4,700 µF load capacitance. Under this condition the PWRGD takes about 8.7 seconds to go high after the UVEN input is pulled high upon the complete insertion of the board into the shelf. Figure 10’s time-scale is too long to show the current pulses that charge the bulk capacitance.After insertion, when the UVEN voltage exceeds 34 V the UV detection fault is cleared, the QPI- 10 goes through a delay cycle (~15 ms) to allow for system stabilization and debounce. After this time, the QPI– to BUS- path is turned on and current is allowed to pass, monitored by the current sense function. Initially the current level exceeds the 6 A circuit breaker limit, the event timer starts and the Power Good state is not valid. The sense function and linear control loop will allow twice the circuit breaker current to pass. If the current does not drop below the circuit breaker level prior to reaching the timer limit, typically 275 µs, the QPI- to BUS- path will open. The effective duty cycle under the current limit condition is approximately 1%. Once the load capacitors are fully charged to the input bus potential, the load condition falls below 6 A and the PWRGD pin is asserted high, providing that the bus supply is still within the valid UV and OV range. Transient Protection and Recovery Figures 11 and 12 show the QPI-10’s ability to handle low resistance shorts (< 2 Ω) at the load terminals to emulate fast and slow blown fuse events. In Figure 11, the transient short is 2 seconds long and the QPI- to BUS- path is opened within 400 µs of this occurrence. Figure 12 demonstrates the QPI-10’s performance with a continuous short circuit on its output, where it remains in a low duty cycle mode until the short is removed, then restarts normally. |
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