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参数资料
| 型号： | LTC4253ACGN-ADJ#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 20; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-20 |
| 文件页数： | 3/32页 |
| 文件大小： | 611K |
| 代理商： | LTC4253ACGN-ADJ#TRPBF |
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LTC4253A-ADJ
11
4253a-adjf
OPERATIO
U
Hot Circuit Insertion
When circuit boards are inserted into a live backplane, the
supply bypass capacitors can draw huge transient cur-
rents 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 LTC4253A-ADJ is designed to turn on a circuit board
supply in a controlled manner, allowing insertion or re-
moval without glitches or connector damage.
Initial Start-Up
The LTC4253A-ADJ resides on a removable circuit board
and controls the path between the connector and load or
power conversion circuitry with an external MOSFET switch.
Both inrush control and short-circuit protection are pro-
vided by the MOSFET.
A detailed schematic is shown in Figure 1. – 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/UVL/OV/OVL determines whether or not the
MOSFET should be turned on based upon internal high
accuracy thresholds and an external divider. UV/UVL/OV/
OVL 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.
Interlock Conditions
A start-up sequence commences once these “interlock”
conditions are met:
1. The input voltage VIN exceeds VLKO (UVLO)
2. The voltage at UV > VUVHI
3. The voltage at OVL < VOVLO
4. The input voltage at RESET < 0.8V
5. The (SENSE – VEE) voltage < 50mV (VCB)
6. The voltage at SS is < 0.2V (20 VOS)
7. The voltage on the TIMER capacitor (CT) is
< 1V (VTMRL)
8. The voltage at GATE is < 0.5V (VGATEL)
The first four conditions are continuously monitored and
the latter four are checked prior to initial timing or GATE
ramp-up. Upon exiting an overvoltage condition, the
TIMER pin voltage requirement is inhibited. Details are
described in the Applications Information, Timing Wave-
forms section.
Figure 1. – 48V/2.5A Application with Operating Range from 43V to 82V
R6
5.6k
R7
5.6k
R8
5.6k
PWRGD1
VIN
RESET
VIN
VEE
SEL
LTC4253A-ADJ
POWER
MODULE 1
PWRGD2
PWRGD3
OV
OVL
DRAIN
SS
GATE
SQTIMER
SENSE
TIMER
EN
POWER
MODULE 2
EN
POWER
MODULE 3
EN
RIN
2.5k
15k(1/4W)/6
UV
UVL
R5
EN3
EN2
4253A F01
RC
10
RD 1M
RS
0.02
VIN
EN2
EN3
POWER
MODULE 1
OUTPUT
POWER
MODULE 2
OUTPUT
Q1
IRF530S
CC
10nF
CT
0.68
F
C1
10nF
CSQ
0.1
F
CSS 33nF
+
CL
100
F
CIN
1
F
R2
0.976k
1%
2.74k
1%
– 48V RTN
(SHORT PIN)
– 48V RTN
(LONG PIN)
– 48V
(LONG PIN)
RESET
(LONG PIN)
R1
20k
1%
R3
2.1k 1%
R4
2.37k 1%
294k
1%
MOC207
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4253ACUF-ADJ#PBF | -48V Hot Swap Controller with Sequencer; Package: QFN; No of Pins: 20; Temperature Range: 0°C to +70°C |
| LTC4253ACUF-ADJ#TRPBF | -48V Hot Swap Controller with Sequencer; Package: QFN; No of Pins: 20; Temperature Range: 0°C to +70°C |
| LTC4253AIGN-ADJ#PBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +85°C |
| LTC4253AIGN-ADJ#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +85°C |
| LTC4253AIUF-ADJ#PBF | -48V Hot Swap Controller with Sequencer; Package: QFN; No of Pins: 20; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4253ACUF-ADJ#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 20-Pin QFN EP |
| LTC4253ACUF-ADJ#TRPBF | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 20-Pin QFN EP T/R |
| LTC4253AIGN#PBF | 功能描述:IC HOT SWAP CONTRLR -48V 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4253AIGN#TRPBF | 功能描述:IC HOT SWAP CONTRLR -48V 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4253AIGN-ADJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:-48V Hot Swap Controller with Sequencer |
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