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UC2914DW датащи(PDF) 11 Page - Texas Instruments

номер детали UC2914DW
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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UC2914DW датащи(HTML) 11 Page - Texas Instruments

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UC2914
UC3914
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
11
www.ti.com
APPLICATION INFORMATION
UDG−97055
Figure 4. Typical Timing Diagram Using Latch Reset (LR) Function
Table 2. Fault Timing Conditions with Latch Reset Function
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
Reset comparator threshold reached but no retry since LR pin held high.
t5
LR toggled low, N-channel MOSFET turned on and sources current to load.
t6=t3
t7
LR toggled low before VCT reaches reset comparator threshold, causing retry.
t8
Since LR toggled low during present cycle, N-channel MOSFET turned on and sources current to load.
t9=t0
Fault released, normal condition. Return to normal operation of the load.


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