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Physical Fuse Selection
In regulation 8.5.A, it states, “A DC-rated fuse (not a circuit breaker) must be placed first in series with the battery starting at the positive connection within each battery enclosure.” This means we can't rely solely on the eFuse, and we need to place a physical fuse in series.
eFuse Parts Selection
eFuse IC: TPS25983 (
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$t$C_{ITIMER} (msnF) = \frac{Ct_{ITIMER} (nFms) * I_{ITIMER} (\mu A)}{\Delta V_{ITIMER} (V)} = \frac{t_{ITIMER} (ms) * I_{ITIMER} (\mu A)}$A)}{\Delta V_{ITIMER} (V) * 10^6}$ |
We can find I_ITIMER and ΔV_ITIMER in the Electrical Characteristics on p. 8 of the eFuse datasheet. With their typical values, we can simplify this to be…
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$C_{ITIMER} (nF) = \frac{t_{ITIMER} (ms)}{0.467}$ |
Additionally, we can leave the pin open for no blanking interval. Do not short the ITIMER pin to ground.
Decision: We will leave the pin open for no blanking interval by default and determine proper blanking intervals on a case-by-case basis depending on the amount of inrush.
Current Monitoring Resistor
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Our ADC can read a maximum value of 3.3 V (most likely, need to confirm), so V_IMON = 3.3 V. Although, Table 8-2 of the eFuse datasheet recommends leaving
The maximum ILOAD of the eFuse is 18 A. Although most, if not all, of our outputs will not utilize that full quantity, we will
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