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UCC3913 Datasheet(PDF) 5 Page - Texas Instruments

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Part # UCC3913
Description  Negative Voltage Hot Swap Power Manager
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3913 Datasheet(HTML) 5 Page - Texas Instruments

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5
UCC1913
UCC2913
UCC3913
IOUT
IMAX
IFAULT
Io(nom)
0A
VCT
2.5V
0.5V
0V
0V
VOUT
VSS
t0 t1 t2
t3
t4
t5
t6 t7 t8
t9 t10
t
t
t
Output
Current
CT
Voltage
(w/respect to VSS)
Output
Voltage
(w/respect to GND)
APPLICATION INFORMATION (cont.)
Figure 2. Typical timing diagram.
t0: safe condition – output current is nominal, output
voltage is at the negative rail, VSS.
t1: fault control reached – output current rises above
the programmed fault value, CT begins to charge at
≅ 36µA.
t2: max current reached – output current reaches the
programmed maximum level and becomes a con-
stant current with value IMAX.
t3: fault occurs – CT has charged to 2.5V, fault output
goes high, the FET turns off allowing no output cur-
rent to flow, VOUT floats up to ground.
t4: retry – CT has discharged to 0.5V, but fault current
is still exceeded, CT begins charging again, FET is
on, VOUT pulled down to VSS.
t5:
t5 = t3: illustrates 3%duty cycle.
t6:
t6 = t4
t7: output short circuit - if VOUT is short circuited to
ground, CT charges at a higher rate depending
upon the values for VSS and RPL.
t8: fault occurs – output is still short circuited, but the
occurrence of a fault turns the FET off so no current
is conducted.
t9: t9 = t4; output short circuit released, still in fault
mode.
t10: t10 = t0; fault released, safe condition – return to
normal operaton of the circuit breaker.


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