ADM1073ARUZ-REEL7 Просмотр технического описания (PDF) - Analog Devices

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ADM1073ARUZ-REEL7

Full-Feature −48 V Hot Swap Controller

Analog Devices 

Data Sheet

GENERAL DESCRIPTION

(continued from Page 1)

Further control of the inrush current is provided by modulating

the width of the pulses, depending on the drain-source voltage

across the FET. This allows maximum charge transfer to the

load capacitance while maintaining the FET in its safe operating

area (SOA).

The default duty cycle of the pulse train is 6%, decreasing to

2.5% with maximum FET drain-source voltage, with a

maximum of seven successive autorestarts. After seven

successive autorestarts, the fault is latched and the part goes into

shutdown, with the result that the external FET is disabled until

the power is reset. The LATCHED output signal indicates when

the seven retries are complete.

Further programmability is offered by allowing alteration of the

default 6% ratio. An extra resistor between the TIMER pin and

VEE allows the ratio of on-time to off-time to be decreased,

while a resistor between TIMER and VIN allows the ratio to be

increased.

The ADM1073 has separate UV and OV pins for undervoltage

and overvoltage detection. The FET is turned off, if a

nontransient voltage less than the undervoltage threshold

ADM1073

(typically −36 V) is detected on the UV pin, or if greater than

the overvoltage threshold (typically −80 V) is detected on the

OV pin. The operating voltage window of the ADM1073 is

programmable via resistor networks on the UV and OV pins.

The hysteresis levels on the undervoltage and overvoltage

detectors can also be altered (see the Undervoltage/Overvoltage

Detection section). The SPLYGD output signal indicates when

the backplane supply is within the externally programmable

operating voltage range.

Other functions include

• PWRGD output, which can be used to enable a power

module (the DRAIN pin is monitored to determine when

the load capacitance is fully charged)

• SHDN input to manually disable the GATE drive

• RESTART input to remotely initiate a 5 second shutdown

The ADM1073 is fabricated using BiCMOS technology for

minimal power consumption and is available in a 14-lead

TSSOP package.

Rev. B | Page 3 of 24

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