iC-MFN
8-FOLD FAIL-SAFE N-FET DRIVER
Rev A2, Page 12/13
INx
Example
Turn on calculation with following estimations:
Ciss@(Vds = 24 V) = 1.5 nF
Ciss@(Vds = 1 V) = 3 nF
Crss@(Vds = 24 V) = 0.3 nF
Isc(OUTx)hi = -4 mA
VB = 24 V
V(OUTx)
VD
Vr(OUTx) = 10 V
Vth(FET) = 3 V
From this follows:
V(NOK)
t
tt0..t1 = 1.13 µs
tt1..t2 = 1.8 µs
Figure 10: Turn on and off one channel with INx
tt2..t3 = 5.25 µs
ton = 8.18 µs
The slew rate at the drain of transistor is: 13.3 V/µs
Figure 10 shows the turn on and off at one channel
with pin INx. The pulse duration at pin NOK, especially
at turn on, can be used for monitoring the connected
transistor and the load.
Figure 11: Circuit diagram one channel with moni-
toring comparator
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