MAX5916EUI+【PDF 14/25 页】IC HOT-SWAP CTRLR DUAL 28-TSSOP

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Input Undervoltage Lockout

UVLO prevents these devices from turning on

internal/external MOSFETs until the input voltage exceeds

the lockout threshold. The UVLO protects the MOSFETs

from insufficient gate-drive voltage. Figure 2 shows that if

an input undervoltage condition exists for more than

DEG,UVLO

, the outputs are disabled and PGOOD_ goes

low immediately. The time delay t

DEG,UVLO

is negative

edge delayed and acts as a deglitch.

Fault Management

When a fault is detected on one of the main outputs, the

MAX5915/MAX5915A/MAX5916/MAX5916A disable the

channel outputs after t

DELAY

. A fault occurs when any of

the output voltages fall below their output undervoltage

threshold or any of the output currents exceed their out-

put overcurrent threshold. PGOOD_ pulls low if a fault

persists for more than t

RESP

. The channel with the fault is

disabled after t

DELAY

. The MAX5915/MAX5916 are avail-

able with a response time of 1.5ms (t

RESP

). The

MAX5915A/MAX5916A offer a response time of 100ns

RESP2

). If the fault is removed before t

DELAY

, the chan-

nel remains on and PGOOD_ pulls high immediately.

Latched Fault Protection

The MAX5915/MAX5915A latch off the appropriate

channels main outputs. Toggling +12VIN or ON_

restarts the main outputs. Figure 3 outlines the logic for

the main and auxiliary shutdown control of the

MAX5915, while fault handling is shown in Figures 5

and 6.

Autoretry Fault Protection

The MAX5916/MAX5916A automatically restart the out-

puts after t

RESTART

. The MAX5915/MAX5915A/

MAX5916/MAX5916A handle faults on the auxiliary out-

puts by automatically restarting the appropriate chan-

nel. Figure 4 outlines the logic for the main and auxiliary

shutdown control of the MAX5916, while fault handling

is shown in Figures 6 and 7.

Output Overcurrent

External sense resistors monitor the current on the +5V

and +3.3V outputs, while the +3.3V auxiliary and ?2V

output currents are monitored internally. Figures 5, 6,

and 7 show overcurrent fault management for the

MAX5915/MAX5915A/MAX5916/MAX5916A.

Dual PCI 2.2 Hot-Swap Controllers

14 ______________________________________________________________________________________

ON_

+12VIN

3.3VAUXIN

PGOOD_

AUXON_

+12V UVLO THRESHOLD

3.3VAUX UVLO THRESHOLD

START

DEG.UVLO

+12VO_

5VO_

3.3VO_

3.3VAUXO_

-12VO_

TIMING NOT TO SCALE

Figure 2. Input UVLO Fault Management in the MAX5915/MAX5915A/MAX5916/MAX5916A

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