MAX5938LEEE+【PDF 8/26 页】IC HOT-SWAP CTRLR -48V 16-QSOP

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Sheet目录43

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capacitance (gate-to-drain) would pull up and turn on

the MOSFET gate when the MOSFET drain is rapidly

pulled up by the V

step during backplane contact.

The MAX5938 GATE clamp can overcome the gate-to-

drain capacitance of large power MOSFETs with added

slew-rate control (C

SLEW

) capacitors while eliminating

the need for additional gate-to-source capacitance.

The MAX5938 keeps the MOSFET off indefinitely if the

supply voltage is below the user-set ON and OFF

thresholds, if the supply voltage is above the user-set

overvoltage (OV) threshold, or if a short circuit (user-

defined) is detected in the load connected to the drain

of the power MOSFET.

The MAX5938 conducts a load-probe test after contact

transients from the hot plug-in have settled. This follows

the MAX5938 power-up (when the ON, OFF, and OV

conditions have been met for 220ms (t

)) and prior to

the turn-on of the power MOSFET. This test pulls a user-

programmable current through the load (1A, max) for up

to 220ms (t

) and tests for a voltage of 200mV across

the load at V

OUT

(Figure 3). This current is set by an

external resistor, R

(Figure 17) between V

OUT

and LP.

When the voltage across the load exceeds 200mV, the

test is truncated and the GATE turn-on sequence is start-

ed. If at the end of the 200ms (t

) test period the volt-

age across the load has not reached 200mV, the load is

assumed to be shorted and the current to the load from

Figure 1. Functional Diagram

10V REG

AND

5V REG

PGOOD

POLARITY

LOGIC

ON, OFF,

AND OV

LOGIC CONTROL

BANDGAP

REF

10礎

FAULT

DETECTION

SEQUENCER

CONTROLLER

TIMER

GATE

CONTROL

LOAD-PROBE

TEST

, V

, AND

75% OF V

COMPARATORS

STEP

50礎 TEMP

COMPENSATED

CURRENT SOURCE

(1.25V)

+5V

+10V

52礎

2V AND

15V

CLAMP

PGOOD

LOGIC

MAX5938

PGOOD

OUT

GATE

LOAD

GND

STEP_MON

GND

INT

2k&

CB_ADJ

OFF

POL_SEL

-48V Hot-Swap Controller with V

Step Immunity,

No R

SENSE

, and Overvoltage Protection

8 _______________________________________________________________________________________

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