Rainbow-electronics MAX5943 Manuel d'utilisateur télécharger pdf (Page 17)

MAX5943

FireWire Current Limiter and Low-Drop

ORing Switch Controller

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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.

DS(ON)1

SENSE

SENSE GATE1 GATE2 OUT

ISC

MAX5943B–MAX5943E

Figure 12. Power Dissipated Across MOSFETs During a Short-

Circuit Fault for MAX5943B–MAX5943E

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Rainbow-electronics MAX5943 Manuel d'utilisateur Page 17