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LT4256-3 Datasheet

  • LT4256-3

  • Positive High Voltage Hot Swap Controller with Open-Circuit ...

  • 20頁

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LT4256-3
Positive High Voltage
Hot Swap Controller
with Open-Circuit Detect
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Allows Safe Board Insertion and Removal from a
Live Backplane
Controls Supply Voltage from 10.8V to 80V
Foldback Current Limiting
Open Circuit and Overcurrent Fault Detect
Drives an External N-Channel MOSFET
Automatic Retry or Latched Off Operation
After Overcurrent Fault
Programmable Supply Voltage Power-Up Rate
Open MOSFET Detection
1% Over and Undervoltage Detection Accuracy
Available in a 16-Lead SSOP Package
The LT
廬
4256-3 is a high voltage Hot Swap controller that
allows a board to be safely inserted and removed from a
live backplane. An internal driver controls the high side
N-channel MOSFET gate for supply voltages ranging from
10.8V to 80V. The part features an open-circuit detect
(OPEN) output that indicates abnormally low load current
conditions.
The LT4256-3 also features an adjustable analog foldback
current limit. If the supply remains in current limit for more
than a programmable time, the N-channel MOSFET shuts
off, the PWRGD output asserts low and the LT4256-3
either automatically restarts after a time-out delay or
latches off until the UV pin is cycled low (depending on the
status of the RETRY pin).
The PWRGD output indicates when the output voltage
rises above a programmed level. An external resistor
string from V
CC
provides programmable undervoltage and
overvoltage protection.
The LT4256-3 is available in a 16-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
Hot Board Insertion
Electronic Circuit Breaker/Power Bussing
Industrial High Side Switch/Circuit Breaker
24V/48V Industrial/Alarm Systems
Ideally Suited for 12V, 24V and 48V Distributed
Power Systems
48V Telecom Systems
TYPICAL APPLICATIO
V
IN
48V
SMAT70A
(SHORT PIN)
64.9k
UV
0.01碌F
4.02k
OV
4.02k
OPEN
TIMER
GND
33nF
GND
V
CC
0.020鈩?/div>
48V, 2A Hot Swap Controller
IRF540
+
CMPZ5241BS
11V
SENSE
10鈩?/div>
GATE
LT4256-3
V
OUT
FB
100鈩?/div>
10nF
36.5k
51k
C
L
V
OUT
48V
2A
V
IN
50V/DIV
4.02k
INRUSH
CURRENT
500mA/DIV
PWRGD
50V/DIV
PWRGD
4256 TA01
PWRGD
UV = 36V
OV = 73V
PWRGD = 40V
RETRY
U
TM
U
U
LT4256-3 Start-Up Behavior
CONTACT BOUNCE
V
OUT
50V/DIV
2.5ms/DIV
42563 TA02
42563f
1

LT4256-3相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
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  • 英文版
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  • 英文版
    Positive High Voltage Hot Swap Controller with Open-Circuit ...
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