UCC3916PWP

更新时间： 2024-11-20 13:15:07

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德州仪器 - TI		/
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UCC3916PWP 数据手册

UCC3916

SCSI Termpower Manager

FEATURES

DESCRIPTION

• Integrated Circuit Breaker Function

The UCC3916 SCSI termpower manager provides complete power man-

agement, hot swap capability, and circuit breaker functions with minimal ex-

ternal components. For most applications, the only external component

required to operate the device, other than supply bypassing, is a timing ca-

pacitor which sets the fault time.

• Integrated 0.2 Power FET

• SCSI, SCSI-2, SCSI-3 Compliant

• 1µA ICC When Disabled

The current trip level is internally set at 1.65A, and the maximum current

level is also internally programmed for 2A. While the output current is below

the trip level of 1.65A, the internal power MOSFET is switched on at a nom-

inal 220mΩ. When the output current exceeds the trip level but remains

less than the maximum current level, the MOSFET remains switched on,

but the fault timer starts charging CT. Once the fault time is reached, the cir-

cuit will shut off for a time which equates to a 3% duty cycle. Finally, when

the output current reaches the maximum current level, the MOSFET transi-

tions from a switch to a constant current source.

• Programmable On Time

• Accurate 1.65A Trip Current and

2.0A Max Current

• Fixed 3% Duty Cycle

• Uni-Directional Switch

• Thermal Shutdown

The UCC3916 is designed for uni-directional current flow, emulating a diode

in series with the power MOSFET.

The UCC3916 can be put in a sleep mode, drawing only 1µA of supply cur-

rent.

Other features include thermal shutdown and low thermal resistance Small

Outline Power package.

BLOCK DIAGRAM

VIN

4V TO 6V

50mV

REVERSE VOLTAGE

COMPARATOR

OUTPUT

CHARGE

PUMP

MAXIMUM

CURRENT

LEVEL

CURRENT SENSE

H=OPEN

POWER

FET

LINEAR

CURRENT

AMPLIFIER

CURRENT

TRIP LEVEL

1.65A

ON TIME CONTROL

3% DUTY CYCLE

OVER CURRENT

COMPARATOR

OUTPUT

THERMAL

SHUTDOWN

1.5V

–

INTERNAL

BIAS

GND GND GND GND

4 HEATSINK PINS

SHTDWN

UDG-99172

SLUS206A - JANUARY 2000

12 3 4 5 6 7

中文翻译

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