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UC2914DW датащи(PDF) 7 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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UC2914
UC3914
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
7
www.ti.com
APPLICATION INFORMATION
The UC3914 is to be used in conjunction with external passive components and an N-channel MOSFET to
facilitate hot swap capability of application modules. A typical application setup is given in Figure 1.
UDG−98194
14
12
11
17
2
10
4
5
9
18
1
8
7
16
6
15
13
+
VPUMP
PLIM
VOUTS
OUT
+
+
+
+
+
S
Q
QR
T
+
CT
LR
GND
VPUMP
PMPB
OSCB
PMP
OSC
R1
R2
C1
C2
SENSE
VCC
IMAX
REF
CP1
VCC − 2 V
Reference
250 kHz
Oscillator
200 mV
50 mV
Overload
Comparator
Overcurrent
Comparator
RPL
To VOUT
RSENSE
VFAULT
= 50 mV
Undervoltage
Lockout
4.0 V/ 3.8 V
To Linear
Amplifier
VOUT + 10 V
(45 VMAX)
CP2
CPUMP
To VOUT
To VCC
RFAULT
FAULT
SD
VCC
15 V
To
Linear
Amplifier
VCC
CT
Fault
Latch
Fault
Timing
Circuitry
H = Close
H = Close
Toggle
1.4 V
0.5 V
2.5 V
3 mA
103
µA
VCC
VCC
3
µA
Q
Q
Figure 1. Typical Application
The term hot swap refers to the system requirement that submodules be swapped in or out upon failure or
system modification without removing power to the operating hardware. The integrity of the power bus must not
be compromised due to the addition of an unpowered module. Significant power bus glitches can occur due to
the substantial initial charging current of on-board module bypass capacitance and other load conditions (for
more information on hot swapping and power management applications, see SLUA157). The UC3914 provides
protection by monitoring and controlling the output current of an external N-channel MOSFET to charge this
capacitance and provide load current. The addition of the N-channel MOSFET, a sense resistor, RSENSE, and
two other resistors, R1 and R2, sets the programmed maximum current level the N-channel MOSFET can
source to charge the load in a controlled manner. The equation for this current, IMAX, is:
I
MAX +
V
VCC * VIMAX
R
SENSE
where
D VIMAX is the voltage generated at the IMAX pin
(4)


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