LTC4242
15
4242f
Figure 5. Normal Power-Down Sequence
APPLICATIO S I FOR ATIO
U
U
U
Figure 6. Overcurrent Fault on 3.3V Output
Figure 7. Short-Circuit Fault on 3.3V Output
Thermal Shutdown
Each of the two internal switches for the 3.3V auxiliary
supplies is protected by an independent thermal shutdown
circuit. If the temperature of an internal switch reaches
150癈, the switch shuts down immediately and AUXFAULT
is latched low. All other power switches are not affected.
The switch is allowed to turn on again by recycling the
AUXON pin low then high with the temperature falling
below 120癈.
Overcurrent Fault
The LTC4242 features dual level glitch tolerant protection
against overcurrent faults for all the supplies. The sense
resistor (both internal and external) voltage drop is moni-
tored by an electronic circuit breaker (ECB) comparator
and an active current limit (ACL) ampli er. In the event that
a supplys current exceeds the ECB threshold, an internal
timer is started. If the supply is still overcurrent after 20祍,
the ECB trips and the MOSFET turns off immediately, as
shown in Figure 6.
During start-up, a supply output could be shorted to ground
in the worst case. The inrush current would be limited to
the ACL threshold, which is 2x the ECB threshold, and the
part will latch off after 20祍.
AUXOUTn
5V/DIV
12V
OUTn
5V/DIV
3V
OUTn
5V/DIV
PGOODn
5V/DIV
100ms/DIV
4242 F05
ENn
5V/DIV
3V
GATEn
5V/DIV
3V
OUTn
5V/DIV
I
LOAD
3A/DIV
5祍/DIV
4242 F06
FAULTn
5V/DIV
3V
GATEn
5V/DIV
3V
OUTn
5V/DIV
I
LOAD
10A/DIV
5祍/DIV
4242 F07
FAULTn
5V/DIV
During an output short circuit, the surge current must be
brought to a controlled level within the shortest amount of
time to protect the system. The LTC4242s active current
limit enters a high current protection mode that immediately
turns off the output MOSFET by pulling its gate-to-source
voltage to zero. Current in the output MOSFET drops from
tens of amps to zero in a few hundred nanoseconds. The
input voltage drops during the high current and then
spikes upwards due to lead parasitic inductances as the
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LTC4244CGN-1#TRPBF
IC CTRLR HOTSWAP PCI 20-SSOP
LTC4245CG#TRPBF
IC CNTRLR HOT SWAP 36-SSOP
LTC4251-2CS6#TRPBF
IC CTRLR HOTSWAP NEGVOLT SOT23-6
LTC4252A-1IMS#TRPBF
IC CNTRLR HOTSWAP NEGVOLT 10MSOP
LTC4253ACGN#TRPBF
IC HOT SWAP CONTRLR -48V 16-SSOP
LTC4257CS8
IC CTRLR INTFACE PWR/ETHER 8SOIC
LTC4260IUH#PBF
IC HOT SWAP CNTRL I2C 32-QFN
LTC4261IGN-2#PBF
IC CTRLR HOTSWAP W/ADC 28-SSOP
相关代理商/技术参数
LTC4242IG
制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Slot Hot Swap Controller for PCI Express
LTC4242IG#PBF
功能描述:IC CNTRLR HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
LTC4242IG#TRPBF
功能描述:IC CNTRLR HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
LTC4242IUHF
制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Slot Hot Swap Controller for PCI Express
LTC4242IUHF#PBF
功能描述:IC CTRLR HOTSWAP DUAL-SLOT 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
LTC4242IUHF#TRPBF
功能描述:IC CNTRLR HOT SWAP 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
LTC4244
制造商:LINER 制造商全称:Linear Technology 功能描述:Rugged, CompactPCI Bus Hot Swap Controllers
LTC4244CGN
功能描述:IC CTRLR HOTSWAP PCI 20-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
