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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： | 8/34页 |
| 文件大小： | 369K |
| 代理商： | LTC4253AIGN#PBF |
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LTC4253/LTC4253A
16
425353afd
applicaTions inForMaTion
The separate UV and OV pins can be used for wider op-
erating range such as 35.6V to 76.3V range as shown in
Figure 2. Other combinations are possible with different
resistors arrangement.
UV/OV COMPARATORS (LTC4253A)
A UV hysteretic comparator detects undervoltage condi-
tions at the UV pin, with the following thresholds:
UV low-to-high (VUV) = 3.08V
UV high-to-low (VUV – VUVHST) = 2.756V
An OV hysteretic comparator detects overvoltage condi-
tions at the OV pin, with the following thresholds:
OV low-to-high (VOV) = 5.09V
OV high-to-low (VOV – VOVHST) = 4.988V
The UV and OV trip point ratio is designed to match the
standard telecom operating range of 43V to 71V when
connected together as in Figure 3. A divider (R1, R2) is
used to scale the supply voltage. Using R1 = 392k and R2
= 30.1k gives a typical operating range of 43.2V to 71.4V.
The undervoltage shutdown and overvoltage recovery
thresholds are then 38.6V and 69.9V. 1% divider resistors
are recommended to preserve threshold accuracy.
The R1-R2 divider values shown in Figure 3 set a stand-
ing current of slightly more than 100A and define an
impedance at UV/OV of 28kΩ. In most applications, 28kΩ
impedance coupled with 324mV UV hysteresis makes
the LTC4253A insensitive to noise. If more noise im-
munity is desired, add a 1nF to 10nF filter capacitor from
UV/OV to VEE.
The UV and OV pins can also be used for a wider operating
range by adding a resistor between UV and OV as shown
in Figure 2 for the LTC4253. Other combinations are pos-
sible with different resistor arrangements.
UV/OV OPERATION
A low input to the UV comparator will reset the chip and
pull the GATE and TIMER pins low. A low-to-high UV
transition will initiate an initial timing sequence if the other
interlock conditions are met. A high-to-low transition in
the UV comparator immediately shuts down the LTC4253/
LTC4253A, pulls the MOSFET gate low and resets the three
latched PWRGD signals high.
An overvoltage condition is detected by the OV compara-
tor and pulls GATE low, thereby shutting down the load,
but it will not reset the circuit breaker TIMER and PWRGD
flags. Returning from the overvoltage condition will
restart the GATE pin if all the interlock conditions except
TIMER are met. Only during the initial timing cycle does
OV condition have an effect of resetting TIMER.
DRAIN
Connecting an external resistor, RD, to this dual function
DRAIN pin allows VOUT (MOSFET drain-source voltage
drop) sensing without it being damaged by large voltage
transients.Below5V,negligiblepinleakageallowsaDRAIN
low comparator to detect VOUT less than 2.39V (VDRNL).
This, together with the GATE low comparator, sets the
PWRGD flag.
When VOUT > VDRNCL, the DRAIN pin is clamped at VDRNCL
and the current flowing in RD is given by:
IDRN ≈
VOUT VDRNCL
RD
(1)
This current is scaled up 8 times during a circuit breaker
fault before being added to the nominal 200A. This ac-
celerates the fault TIMER pull-up when the MOSFET’s
drain-source voltage exceeds VDRNCL and effectively
shortens the MOSFET heating duration.
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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