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参数资料
| 型号： | LTC4225IGN-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 346K |
| 描述： | IC CTLR HOT SWAP DUAL 24-SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 2.9 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
LTC4225-1/LTC4225-2
12
422512f
Board Presence Detect with EN
If ON is high when the EN pin goes low, indicating a board
presence, the LTC4225 initiates a 100ms timing cycle for
contact debounce. Upon board insertion, any bounces
on the EN pin restart the timing cycle. When the 100ms
timing cycle is done, the internal fault latches are cleared.
If the EN pin remains low at the end of the timing cycle,
HGATE is charged up with a 10礎 current source to turn
on the Hot Swap MOSFET .
If the EN pin goes high, indicating a board removal, the
HGATE pin is pulled low with a 300礎 current sink after
a 20祍 delay, turning off the Hot Swap MOSFET without
clearing any latched faults.
Overcurrent Fault
The LTC4225 features an adjustable current limit with circuit
breaker function that protects the external MOSFETs against
short circuits or excessive load current. The voltage across
the external sense resistor (R
S1
, R
S2
) is monitored by an
electronic circuit breaker (ECB) and active current limit
(ACL) amplifier. The electronic circuit breaker will turn off
the Hot Swap MOSFET with a 200mA current from HGATE
to OUT if the voltage across the sense resistor exceeds
V
SENSE(CB)
(50mV) for longer than the fault filter delay
configured at the TMR pin.
Active current limiting begins when the sense voltage
exceeds the ACL threshold V
SENSE(ACL)
(65mV), which
is 1.3?the ECB threshold V
SENSE(CB)
. The gate of the
Hot Swap MOSFET is brought under control by the ACL
amplifier and the output current is regulated to maintain
the ACL threshold across the sense resistor. At this point,
the fault filter starts the timeout with a 100礎 current
charging the TMR pin capacitor. If the TMR pin voltage
exceeds its threshold (1.235V), the external MOSFET
turns off with HGATE pulled to ground by 300礎, and its
associated FAULT pulls low.
After the Hot Swap MOSFET turns off, the TMR pin ca-
pacitor is discharged with a 2礎 pull-down current until
its threshold reaches 0.2V . This is followed by a cool-off
period of 14 timing cycles at the TMR pin. For the latch-off
part (LTC4225-1), the HGATE pin voltage does not restart
at the end of the cool-off period, unless the latched fault
is cleared by pulling the ON pin low or toggling the EN
pin from high to low. For the auto-retry part (LTC4225-2),
the latched fault is cleared automatically at the end of the
cool-off period, and the HGATE pin restarts charging up
to turn on the MOSFET . Figure 4 shows an overcurrent
fault on the 12V output.
In the event of a severe short-circuit fault on the 12V output
as shown in Figure 5, the output current can surge to tens
of amperes. The LTC4225 responds within 1祍 to bring
the current under control by pulling the HGATE to OUT
voltage down to zero volts. Almost immediately, the gate
of the Hot Swap MOSFET recovers rapidly due to the R
HG
and C
HG
network, and current is actively limited until the
electronic circuit breaker times out. Due to parasitic sup-
ply lead inductance, an input supply without any bypass
capacitor may collapse during the high current surge
and then spike upwards when the current is interrupted.
Figure?1 shows the input supply transient suppressors
consisting of Z1, R
SNUB1
, C
SNUB1
and Z2, R
SNUB2
, C
SNUB2
for the two supplies if there is no input capacitance.
applicaTions inForMaTion
Figure 4. Overcurrent Fault on 12V Output
Figure 5. Severe Short-Circuit on 12V Output
OUT
10V/DIV
HGATE
10V/DIV
I
LOAD
40A/DIV
100祍/DIV
422512 F04
OUT
10V/DIV
HGATE
10V/DIV
I
LOAD
40A/DIV
2祍/DIV
422512 F05
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4225IGN-2#PBF | 功能描述:IC CONTROLLER HOT SWAP 24-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) |
| LTC4225IGN-2#TRPBF | 功能描述:IC CTLR HOT SWAP DUAL 24-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) |
| LTC4225IUFD-1#PBF | 功能描述:IC CONTROLLER HOT SWAP 24-QFN 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 |
| LTC4225IUFD-1#TRPBF | 功能描述:IC CTLR HOT SWAP DUAL 24-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) |
| LTC4225IUFD-2#PBF | 功能描述:IC CONTROLLER HOT SWAP 24-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) |
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