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UC2914 датащи(PDF) 8 Page - Texas Instruments

номер детали UC2914
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 датащи(HTML) 8 Page - Texas Instruments

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UC2914
UC3914
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
8
www.ti.com
APPLICATION INFORMATION
Analysis of the application circuit shows that VIMAX (with respect to GND) can be defined as:
V
IMAX + VREF )
V
CC * VREF
R1
R1
) R2
+ 2V
R1
R1
) R2 )
V
REF
where
D VREF is the voltage on the REF pin, an internally generated potential 2-V below VCC
The UC3914 also has an internal overcurrent comparator which monitors the voltage between SENSE and
VCC. If this voltage exceeds 50 mV, the comparator determines that a fault has occurred, and a timing capacitor,
CT, begins to charge. This can be rewritten as a current which causes a fault, IFAULT:
I
FAULT +
50 mV
R
SENSE
FAULT TIMING
Figure 2 shows the circuitry associated with the fault timing function of the UC3914. A typical fault mode, where
the overload comparator and current source I3 do not factor into operation (switch S2 is open), is first
considered. Once the voltage across RSENSE exceeds 50 mV, a fault has occurred. This causes the timing
capacitor, CT, to charge with a combination of 100 µA (I1) plus the current from the power limiting circuitry (IPL).
UDG−03158
2
17
VCC
SENSE
12
14
15
VOUTS
PLIM
CT
+
S1
S2
+
+
+
0.5 V
SQ
Q
R
FAULT
LATCH
H=CLOSE
H=CLOSE
RPL
RSENSE
To LOAD
CT
50 mV
VCC
VCC
103
µA
3 mA
2.5 V
0.2 V
IMAX
SENSE
To
Output
Drive
H=OFF
Reset
Comparator
I2
3
µA
Fault
Comparator
IPL
To
Output
Overload
Comparator
To VCC
I1
I3
Figure 2. Fault Timing Circuitry Including Power Limit and Overcurrent
(5)
(6)


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