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PI2211 Design Guidelines
Table 1 lists some typical system configurations; their N-
MOSFETs and associated PI2211 programming resistors.
There are 9 different MOSFETs listed from various
manufacturers; all in the 5 x 6mm power tabbed package.
When designing a system that is not captured by the
reference designs listed in Table 1, the recommended design
steps are as follows:
1) Determine the value and power rating of the current
sense resistor (R SENSE ) based on the maximum
allowed current where a circuit breaker fault event
will be set.
2)
Determine the maximum RDS ON and R θ J-A that the
system can tolerate for a 60°C delta rise in junction
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PI2211
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Where; 0.025V is the internal reference voltage for the start-
up current to the sense comparator.
The circuit breaker threshold, I CB , is approximately twice the
I START-UP current. When designing a system using the PI2211, it
is often better to determine the maximum over-current
threshold that the design can tolerate rather than the start-
up current, since during start-up the MOSFET is protected by
the PI2211 SOA capabilities.
3)
4)
temperature to chose an appropriate MOSFET.
Calculate the required programming resistors of the
PI2211 based on the system requirements and the
selected MOSFET.
Calculate the under and over-voltage resistors,
based on the required window of operation of the
Where; 0.052V is the internal reference voltage for circuit
breaker threshold to the sense comparator.
The power rating of R SENSE should calculated to be about
double that of the power dissipated at the over-current level.
BUS voltage.
Component values for the PI2211 can be taken directly from
the reference design examples, by using the equations in this
datasheet, or by using the Windows? based component
calculator software for the PI2211.
1) Sense Resistor Calculation:
2) Maximum RDS ON and R θ J-A Calculation:
The product of the constant power across the MOSFET and
the junction to ambient thermal resistance (R θ J-A ) must be
less than 60°C. The power across the MOSFET is the product
of the square of the maximum operating current and the
RDS ON , multiplied by the RDS ON thermal scalar at 150°C, which
is typically about 1.6.
The value of the current sense resistor, R SENSE , determines the
start-up current limit and circuit breaker threshold. During
start-up, the PI2211 will actively regulate at the start-up
current limit, which is calculated as follows:
Figure 14 - Examples of an RDS ON (left) and a RDS SCALAR thermal scalar (right) graphs.
Picor Corporation · picorpower.com
PI2211
Rev 1.0, Page 18 of 26
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