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Protection Parts Selection
eFuse IC: TPS25983 (
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It’s on the more pricy side of TI eFuses but the wide current range and flexibility in voltage will allow us to save costs by requiring fewer ICs if we can keep the same system working into the next-generation vehicle.
Calculated Component Values for eFuse Protection Functions
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Overcurrent Limit
According to the datasheet, the formula for determining the resistance of a particular current limit is…
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For a current limit range of 2 - 18 A, a range of possible goes from 81.610 Ω to 772.487 Ω.
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On the BBPDU, we will be using a digital POT IC to be able to easily change the current limit through code. Its selection is described in a section below.
Overcurrent Blanking Interval
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Another potential option could be the AD8400. It has a smaller package, more resistance positions, and a smaller package, but is significantly more expensive.
External FET:
The TP25983 offers the ability to drive the gate of an external FET to block reverse current.