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UCC3913N Datasheet(PDF) 6 Page - Texas Instruments

Part # UCC3913N
Description  NEGATIVE VOLTAGE HOT SWAP POWER MANAGER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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UCC2913
UCC3913
SLUS274A – JANUARY 1999 – REVISED APRIL 2003
6
www.ti.com
APPLICATION INFORMATION
Typical Fault Mode
Figure 1 shows the detailed circuitry for the fault timing function of the UCCx913. This initial discussion of the
typical fault mode ignores the overload comparator, and current source I3. Once the voltage across the current
sense resistor, RS, exceeds 50 mV, a fault has occurred. This causes the timing capacitor to charge with a
combination of 36
µA plus the current from the power limiting amplifier. The PL amplifier is designed to source
current into the CT pin only and to begin sourcing current once the voltage across the output FET exceeds 5 V.
The current IPL is related to the voltage across the FET with the following expression:
I
PL +
V
FET * 5V
R
PL
where VFET is the voltage across the N-channel MOSFET pass device.
(How this feature limits average power dissipation in the pass device is described in further detail in the following
sections). Note that under a condition where the output current is more than the fault level, but less than the
maximum level, VOUT ≈ VSS (input voltage), IPL = 0, the CT charging current is 36 µA.
UDG–99004
8
5
6
4
OVERCURRENT
COMPARATOR
PL
+
SENSE
VSS
VSS
INPUT VOLTAGE
OUTPUT
LOAD
I1
+
SQ
Q
R
H=CLOSE
I2
I3
1mA
+
SENSE
IMAX
+
+
H=CLOSE
0.5 V
2.5 V
CT
VSS
TO OUTPUT
DRIVE
H=OFF
OVERLOAD COMPARATOR
CT
FAULT TIMING CIRCUITRY
0.2 V
50 mV
VDD
RPL
RS
5.0 V
1
µA
36
µA
Figure 1. Fault Timing Circuitry Including Power Limit and Overload Comparator
(5)


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