Rainbow Electronics MAX5943 - Manual (Page 17)

MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
______________________________________________________________________________________ 17
Transient Protection
If IN or OUT experiences a fast voltage transient, the
drain-to-gate parasitic capacitance of Q1 and/or Q2
may be sufficient to briefly enhance one of the transis-
tors, allowing current glitch. If the circuit is subjected to
large transients, connect capacitors from the gate to
source across the appropriate MOSFET, preventing the
parasitic capacitance from turning on the device.
Caution: The additional gate-to-source capacitance
causes the turn-off time of the MOSFETs to increase due
to the additional charge of the capacitor. Use the mini-
mum capacitor value to prevent currents from flowing in
hot-plug situations.
R DS(ON)1 R DS(ON)1
R
SENSE
SENSE GATE1 GATE2 OUT
ISC
IN
V IN
MAX5943B–MAX5943E
Figure 12. Power Dissipated Across MOSFETs During a Short-
Circuit Fault for MAX5943B–MAX5943E