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参数资料
| 型号： | LTC4253AIGN#PBF |
| 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: 16; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 6/34页 |
| 文件大小： | 369K |
| 代理商： | LTC4253AIGN#PBF |
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LTC4253/LTC4253A
14
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applicaTions inForMaTion
operaTion
Higher overloads are handled by an analog current limit
loop. If the drop across RS reaches VACL, the current
limiting loop servos the MOSFET gate and maintains a
constant output current of VACL/RS. In current limit mode,
VOUT (MOSFET drain-source voltage drop) typically rises
and this increases MOSFET heating. If VOUT > VDRNCL,
connecting an external resistor, RD between VOUT and
DRAIN allows the fault timing cycle to be shortened by
accelerating the charging of the TIMER capacitor. The
TIMER pull-up current is increased by 8 IDRN. Note that
because SENSE > 50mV, TIMER charges CT during this
time, and the LTC4253/LTC4253A eventually shut down.
Low impedance failures on the load side of the LTC4253/
LTC4253A, coupled with 48V or more driving potential,
can produce current slew rates well in excess of 50A/s.
Under these conditions, overshoot is inevitable. A fast
SENSE comparator with a threshold of 200mV detects
overshoot and pulls GATE low much harder and hence
much faster than the weaker current limit loop. The VACL/
RS current limit loop then takes over and servos the cur-
rent as previously described. As before, TIMER runs and
shuts down the LTC4253/LTC4253A when CT reaches 4V.
If CT reaches 4V, the LTC4253/LTC4253A latch off with a
5Apull-upcurrentsource.TheLTC4253/LTC4253Acircuit
breaker latch is reset by either pulling the RESET pin active
high until TIMER goes low, pulling UV momentarily low,
dropping the input voltage VIN below the internal UVLO
thresholdorpulsingTIMERmomentarilylowwithaswitch.
Although short-circuits are the most obvious fault type,
several operating conditions may invoke overcurrent
protection. Noise spikes from the backplane or load, input
stepscausedbytheconnectionofasecond,highervoltage
supply, transient currents caused by faults on adjacent
circuit boards sharing the same power bus or the insertion
of non-hot swappable products could cause higher than
anticipated input current and temporary detection of an
overcurrent condition. The action of TIMER and CT rejects
these events allowing the LTC4253/LTC4253A to “ride out”
temporary overloads and disturbances that could trip a
simplecurrentcomparatorand,insomecases,blowafuse.
pins, the area in and around the LTC4253 and all associ-
ated components should be free of any other planes such
as chassis ground, return, or secondary-side power and
ground planes.
VIN may be biased with additional current up to 30mA, to
accomodate external loading such as the PWRGD opto-
couplers shown in Figure 2. As an alternative to running
higher current, simply buffer VIN with an emitter follower
as shown in Figure 3. A method that cascodes the PWRGD
outputs as shown in Figure 17.
VIN is rated to handle 30mA within the thermal limits of
the package, and is tested to survive a 100s, 100mA
SHUNT REGULATOR
A fast responding shunt regulator clamps the VIN pin to
13V (VZ). Power is derived from –48RTN by an external
current limiting resistor, RIN. A 1F decoupling capacitor,
CIN filters supply transients and contributes a short delay
at start-up.
To meet creepage requirements RIN may be split into two
or more series connected units. This introduces a wider
total spacing than is possible with a single component
while at the same time ballasting the potential across the
gap under each resistor. The LTC4253 is fundamentally a
low voltage device that operates with –48V as its reference
ground. To further protect against arc discharge into its
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4253AIGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC4253CGN#PBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4253CGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4253IGN#PBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC4253IGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
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| LTC4253BCGN#PBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4253BCGN#PBF | 制造商:Linear Technology 功能描述:HOT SWAP CONTROLLER -48V SSOP-16 |
| LTC4253BCGN#TRPBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP 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 |
| LTC4253BIGN#PBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4253BIGN#PBF | 制造商:Linear Technology 功能描述:HOT SWAP CONTROLLER -48V SSOP-16 |
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