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QPI-10LZ-01 Datasheet(PDF) 6 Page - Vicor Corporation

Part # QPI-10LZ-01
Description  AdvancedTCATM Hot-Swap SiP with VI Chip EMI Filter
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

QPI-10LZ-01 Datasheet(HTML) 6 Page - Vicor Corporation

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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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