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UC2914DWTRG4 датащи(PDF) 2 Page - Texas Instruments

номер детали UC2914DWTRG4
подробное описание детали  5-V TO 35-V HOT SWAP POWER MANAGER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC2914
UC3914
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
2
www.ti.com
DESCRIPTION (continued)
When the output current is less than the fault level, the external output transistor remains switched on. When
the output current exceeds the fault level, but is less than the maximum sourcing level programmed by IMAX,
the output remains switched on, and the fault timer starts to charge CT, a timing capacitor. Once CT charges
to 2.5 V, the output device is turned off and CT is slowly discharged. Once CT is discharged to 0.5 V, the device
performs a retry and the output transistor is switched on again. The UC3914 offers two distinct reset modes.
In one mode with LR left floating or held low, the device tries to reset itself repeatedly if a fault occurs as
described above. In the second mode with LR held high, once a fault occurs, the output is latched off until either
LR is toggled low, the part is shutdown then re−enabled using SD, or the power to the part is turned off and then
on again.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted.(1)(2)
UC2914
UC3914
UNIT
Input supply voltage
VCC
40
Maximum forced voltage
SD, LR
12
V
Maximum forced voltage
IMAX
VCC
V
Maximum current
FAULT
20
mA
Maximum current
PLIM
10
mA
Maximum voltage
FAULT
40
V
Reference output current
internally limited
A
Storage temperature range, Tstg
−65 to 150
Junction temperature range, TJ
−55 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300
C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is
not implied. Exposure to Absolute Maximum Rated conditions for extended periods may affect device reliability
(2) Currents are positive into and negative out of the specifief terminal unless otherwise noted. All voltage values are with respect to the network
ground terminal.
RECOMMENDED OPERATING CONDITIONS
MIN
NOM
MAX
UNIT
Supply voltage, VCC
5
35
V
Operating free-air temperature range, TA
UC2914
−40
85
°C
Operating free-air temperature range, TA
UC3914
0
70
°C


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