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Once the max and min BUS voltage has been selected,
plugging their values into these three equations will provide
the resistance ratios of the three resistors.
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PI2211
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When charging the capacitive load, the required energy peaks
at the start of the charging and reduces to zero when the
charging is complete. If the energy calculated during the SOA
pulse is considered to be the average current, then the peak
energy is twice this amount. The capacitive load can be
calculated as:
Optional: Max Load Capacitance
Knowing the duration of the power pulse, the user can
calculate the available energy during start-up. Knowing this
energy, a rough calculation of the amount of load capacitance
that can be charged during the initial start-up pulse can be
calculated. This calculation takes no tolerances into account.
The energy provided to the load during an SOA pulse is:
PI2211 Design Calculator
The PI2211 component calculator program is designed to calculate the required programming resistors of the PI2211 controller;
requiring the designed to enter just a few key thermal MOSFET parameters taken from the manufacturer’s datasheet. It is capable of
calculating both an under-voltage/over-voltage divider as well as a current sense divider. It can also derive a usable pulse width
when a MOSFET's R θ J-C curves are not given. Please read the PI2211 Component Calculator user guide for instructions on use and
available features.
Figure 18 - PICOR's Windows? based PI2211 Design Calculator
Picor Corporation · picorpower.com
PI2211
Rev 1.0, Page 22 of 26
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