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参数资料
| 型号： | LTC4253AIGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/34页 |
| 文件大小： | 383K |
| 描述： | IC HOT SWAP CONTRLR -48V 16-SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 8.2 V ~ 14.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
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LTC4253/LTC4253A
12
425353aff
For more information www.linear.com/4253
OPERATION
Hot Circuit Insertion
When circuit boards are inserted into a live backplane,
the supply bypass capacitors can draw huge transient
currents from the power bus as they charge. The flow
of current damages the connector pins and glitches the
power bus, causing other boards in the system to reset.
The LTC4253/LTC4253A are designed to turn on a circuit
board supply in a controlled manner, allowing insertion or
removal without glitches or connector damage.
Initial Start-Up
The LTC4253/LTC4253A reside on a removable circuit
board and control the path between the connector and load
or power conversion circuitry with an external MOSFET
switch (see Figure 1). Both inrush control and short-circuit
protection are provided by the MOSFET .
A detailed schematic is shown in Figure 2. 48V and
48RTN receive power through the longest connector pins
and are the first to connect when the board is inserted.
The GATE pin holds the MOSFET off during this time. UV/
OV determines whether or not the MOSFET should be
turned on based upon internal high accuracy thresholds
and an external divider. UV/OV does double duty by also
monitoring whether or not the connector is seated. The top
of the divider detects 48RTN by way of a short connector
pin that is the last to mate during the insertion sequence.
Figure 2. 48V/2.5A Application with a Wider Operating Range
Figure 1. Basic LTC4253/LTC4253A Hot Swap Topology
LTC4253
LTC4253A
48RTN
4253 F01
PLUG-IN BOARD
48V
BACKPLANE
+
C
LOAD
ISOLATED
DC/DC
CONVERTER
MODULE
LOW
VOLTAGE
CIRCUITRY
+
+
R5
5.6k
R4
5.6k
R6
5.6k
PWRGD1
V
IN
V
EE
LTC4253
POWER
MODULE 1
PWRGD2
PWRGD3
EN3
EN2
UV
OV
RESET
DRAIN
SS
GATE
SQTIMER
SENSE
TIMER
EN
POWER
MODULE 2
EN
POWER
MODULE 3
EN
R
IN
2.5k
15k(1/4W)/6
PUSH
RESET
EN3
4253 F02
EN2
R
C
10
R
D
1M
R
S
0.02
Q1
IRF530S
V
IN
C
C
18nF
C
T
0.33礔
C1
10nF
48RTN
(LONG PIN)
48RTN
(SHORT PIN)
48V
(LONG PIN)
C
SQ
0.1礔
C
SS
68nF
R7
POWER
MODULE 1
OUTPUT
POWER
MODULE 2
OUTPUT
V
IN
R8
+
C
L
100礔
C
IN
1礔
D
IN
DDZ13B*
R1
38.3k
1%
R3
432k
1%
R9
47k
R2
4.75k
1%
*DIODES, INC.
MOC207
RECOMMENDED FOR HARSH ENVIRONMENTS.
V
IN
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