- 您现在的位置：买卖IC网 > PDF目录179918 > LTC4252A-2CMS#TRPBF (LINEAR TECHNOLOGY CORP) Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C PDF资料下载
参数资料
| 型号： | LTC4252A-2CMS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 21/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-2CMS#TRPBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
28
425212fb
APPLICATIO S I FOR ATIO
WU
U
Analog Current Limit and Fast Current Limit
In Figure 17a, when SENSE exceeds VACL, GATE is regu-
lated by the analog current limit amplifier loop. When
SENSE drops below VACL, GATE is allowed to pull up. In
Figure 17b, when a severe fault occurs, SENSE exceeds
VFCL and GATE immediately pulls down until the analog
current amplifier establishes control. If the severe fault
causes VOUT to exceed VDRNCL, the DRAIN pin is clamped
at VDRNCL. IDRN flows into the DRAIN pin and is multiplied
by 8. This extra current is added to the TIMER pull-up
current of 230
A. This accelerated TIMER current of
[230
A+8 IDRN] produces a shorter circuit breaker fault
delay. Careful selection of CT, RD and MOSFET can help
prevent SOA damage in a low impedance fault condition.
Soft-Start
If the SS pin is not connected, this pin defaults to a linear
voltage ramp, from 0V to 2.2V in about 180
s (or 0V to
1.4V in 230
s for the LTC4252A) at GATE start-up, as
shown in Figure 18a. If a soft-start capacitor, CSS, is
connected to this SS pin, the soft-start response is modi-
fied from a linear ramp to an RC response (Equation 6), as
shown in Figure 18b. This feature allows load current to
slowly ramp-up at GATE start-up. Soft-start is initiated at
time point 3 by a TIMER transition from VTMRH to VTMRL
(time points 1 to 2) or by the OV pin falling below the VOVLO
threshold after an OV condition. When the SS pin is below
0.2V, the analog current limit amplifier holds GATE low.
Above 0.2V, GATE is released and 58
A ramps up the
compensation network and GATE capacitance at time
point 4. Meanwhile, the SS pin voltage continues to ramp
up. When GATE reaches the MOSFET’s threshold, the
MOSFET begins to conduct. Due to the MOSFET’s high gm,
the MOSFET current quickly reaches the soft-start control
value of VACL(t) (Equation 7). At time point 6, the GATE
voltage is controlled by the current limit amplifier. The
soft-start control voltage reaches the circuit breaker volt-
age, VCB, at time point 7 and the circuit breaker TIMER
activates. As the load capacitor nears full charge, load
Figure 17. Current Limit Behavior (All Waveforms are Referenced to VEE)
(17a) Analog Current Limit Fault
(17b) Fast Current Limit Fault
TIMER
GATE
SENSE
VOUT
VACL
VCB
SS
DRAIN
VTMRH
230
A + 8 IDRN
4252-1/2 F17
PWRGD
5.8
A
5.8
A
TIMER
GATE
SENSE
VOUT
VACL
VCB
VFCL
SS
DRAIN
VTMRH
VDRNCL
230
A + 8 IDRN
PWRGD
12
14
3
2
CB TIMES OUT
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4252A-2IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-2IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252-2CMS8#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4252-2CMS8#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4252-2IMS8#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-2IMS | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 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 |
| LTC4252A-2IMS#PBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP 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 |
| LTC4252A-2IMS#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 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 |
| LTC4252A-2IMS#TRPBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP 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 |
| LTC4252A-2IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
发布紧急采购，3分钟左右您将得到回复。