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UC2914DWG4 датащи(PDF) 9 Page - Texas Instruments

номер детали UC2914DWG4
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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UC2914DWG4 датащи(HTML) 9 Page - Texas Instruments

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UC2914
UC3914
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
9
www.ti.com
APPLICATION INFORMATION
Figure 3 shows typical fault timing waveforms for the external N-channel MOSFET output current, the voltage
on the CT pin, and the output load voltage, VOUT, with LR left floating or grounded.
UDG−97054
Figure 3. Typical Timing Diagram
Table 1. Fault Timing Conditions
TIME
CONDITION
t0
Normal conditions. Output current is nominal, output voltage is at positive rail, VCC
t1
Fault control reached. Output current rises above the programmed fault value, CT begins to charge at 100-µA + IPL.
t2
Maximum current reached. Output current reaches the programmed maximum level and becomes a constant cur-
rent with value IMAX.
t3
Fault occurs. CT has charged to 2.5 V, fault output goes low, the FET turns off allowing no output current to flow,
VVOUTS discharges to GND.
t4
Retry. CT has discharged to 0.5 V, but fault current is still exceeded, CT begins charging again, FET is on, VOUT
increases.
t5 = t3
Illustrates < 3% duty cycle depending upon RPL selected.
t6=t4
t7=t0
Fault released, normal condition. Return to normal operation of the load.


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