參數(shù)資料
型號: LT4250HCN8#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8
封裝: 0.300 INCH, LEAD FREE, PLASTIC, DIP-8
文件頁數(shù): 1/14頁
文件大小: 232K
代理商: LT4250HCN8#TRPBF
LT4250L/LT4250H
1
4250lhfa
TYPICAL APPLICATION
DESCRIPTION
Negative 48V
Hot Swap Controller
Voltage Step on Input Supply
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a
trademark of Linear Technology Corporation.
FEATURES
APPLICATIONS
n Allows Safe Board Insertion and Removal from a
Live –48V Backplane
n Circuit Breaker Immunity to Voltage Steps and
Current Spikes
n Programmable Inrush and Short-Circuit Current
Limits
n Pin Compatible With LT1640L/LT1640H
n Operates from –18V to –80V
n Programmable Overvoltage Protection
n Programmable Undervoltage Lockout
n Power Good Control Output
n Bell-Core Compatible ON/OFF Threshold
n Central Office Switching
n –48V Distributed Power Systems
n Negative Power Supply Control
The LT4250L/LT4250H are 8-pin, negative 48V Hot Swap
controllers that allow a board to be safely inserted and
removed from a live backplane. Inrush current is limited
to a programmable value by controlling the gate voltage
of an external N-channel pass transistor. The pass tran-
sistor is turned off if the input voltage is less than the
programmable undervoltage threshold or greater than
the overvoltage threshold. A programmable current limit
protects the system against shorts. After a 500μs timeout
the current limit activates the electronic circuit breaker.
The PWRGD (LT4250L) or PWRGD (LT4250H) signal can
be used to directly enable a power module. The LT4250L
is designed for modules with a low enable input and the
LT4250H for modules with a high enable input.
The LT4250L/LT4250H are available in 8-pin PDIP and
SO packages
VEE
VDD
LT4250L
SENSE
C1
470nF
25V
C2
15nF
100V
C3
0.1μF
100V
C4
100μF
100V
Q1
IRF530
R2
10Ω
5%
R3
1k, 5%
R4
549k
1%
R6
10k
1%
R1
0.02Ω
5%
4
OV
–48V RTN
(SHORT PIN)
3
2
OV =
71V
*
* DIODES INC. SMAT70A
THESE COMPONENTS ARE APPLICATION
SPECIFIC AND MUST BE SELECTED BASED
UPON OPERATING CONDITIONS AND DESIRED
PERFORMANCE. SEE APPLICATIONS
INFORMATION.
UV =
38.5V
UV
56
8
7
1
GATE
DRAIN
PWRGD
4250 TA01a
VOUT
+
SENSE+
TRIM
SENSE
VOUT
VIN
ON/OFF
LUCENT
JW050A1-E
VIN
+
2
9
5V
8
7
6
5
1
4
+
C5
100μF
16V
+
–48V
INPUT 1
–48V
INPUT 2
UV
RELEASE
AT 43V
R5
6.49k
1%
0.1μF
10V
VEE AND
DRAIN
20V/DIV
ID (Q1)
5A/DIV
500μs/DIV
4250 TA01b
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