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UCC3916 Datasheet(PDF) 3 Page - Texas Instruments

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Part # UCC3916
Description  SCSI Termpower Manager
Download  3 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3916 Datasheet(HTML) 3 Page - Texas Instruments

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UCC3916
PIN DESCRIPTIONS
CT: A capacitor is applied between this pin and ground to
set the maximum fault time. The maximum fault time
must be more than the time to charge external capaci-
tance. The maximum fault time is defined as:
TFAULT= 28 • 10
3 • CT.
Once the fault time is reached the output will shutdown
for a time given by:
TSD = 1 • 10
6 • CT
this results in a 3% duty cycle. 0.1
µF is recommended
for SCSI applications to achieve the normal maximum
capacitance on the Termpwr line.
SHTDWN: The IC enters a low-power sleep mode when
this pin is low and exits the sleep mode when this pin is
high.
VIN: Input voltage to the circuit breaker, ranging from 4V
to 6V.
VOUT: Output voltage of the circuit breaker. When
switched, the output voltage is approximately:
VOUT = VIN – (220m
Ω) • IOUT.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
5
1
8
4
2
3
6
7
UCC3916
VIN
SHTDWN
GND
GND
GND
GND
CT
OUTPUT
C
T
C
LOAD
C
IN
V
IN
TERMPOWER
BUS
D1
TYPICAL APPLICATION
UDG-99169
Protecting The UCC3916 From Voltage Transients
The parasitic inductance associated with the power dis-
tribution can cause a voltage spike at VIN if the load cur-
rent is suddenly interrupted by the UCC3916.
It is
important to limit the peak of this spike to less than 6V to
prevent damage to the UCC3916. This voltage spike can
be minimized by:
• Reducing the power distribution inductance (e.g., twist
the positive (+) and negative (–) leads of the power
supply feeding VIN pin, locate the power supply close
to the UCC3916 or use a PCB ground plane).
• Decoupling VIN with a capacitor, CIN, located close to
the VIN. This capacitor is typically less than 1µF to limit
the inrush current.
• Clamping the voltage at VIN below 6V with a Zener
diode, D1, located close to the VIN pin.
SAFETY RECOMMENDATIONS
Although the UCC3916 is designed to provide system
protection for all fault conditions, all integrated circuits
can ultimately fail short. For this reason, if the UCC3916
is intended for use in safety critical applications where
UL
© or some other safety rating is required, a redundant
safety device such as a fuse should be placed in series
with the device. The UCC3916 will prevent the fuse from
blowing virtually all fault conditions, increasing system
reliability and reducing maintainence cost, in addition to
providing the hot swap benefits of the device.
APPLICATION INFORMATION


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