QPO-1 Datasheet, PDF (9/17 Pages) Vicor Corporation – QPO-1 Output Ripple Attenuation SIP

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QPO-1
QUIETPOWER^
Figure 13 – Optional Start-up circuit using remote sense.
The start-up circuit shown in Figure 13 will short the
converter’s SENSE+ pin to the converter’s positive output
while the system is powering up and the filter’s output
voltage is low. When the voltage difference across the filter
is less than the minimum gate to source voltage of the PFET,
the PFET will turn off and normal voltage sensing will start.
Using the QPO-1 with Split ±Supplies
Figure 14 - ±Supply using two isolated converters.
Figure 14 shows a typically split supply configuration using
two isolated dc to dc converters. Here, the QPO-1’s SC
circuits will compensate each converter for its own headroom
voltage drop. This circuit can be adapted to be used with
converters that have output sensing pins, eliminating the SC
components and the possible start-up circuitry. The QPO-1 is
not recommended for use with single converters that have a
split rail output.
PICOR Corporation · picorpower.com
QPO-1
Rev 3.6
Page 9 of 17