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参数资料
| 型号： | LTC4224CDDB-1#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件页数： | 16/16页 |
| 文件大小： | 215K |
| 代理商： | LTC4224CDDB-1#TRMPBF |
LTC4224-1/LTC4224-2
9
422412fa
APPLICATIONS INFORMATION
time, a 5ms start-up blanking delay begins during which
the circuit breaker is not allowed to latchoff the MOSFET.
If the ECB is tripped at the end of 5ms (time point t3), the
MOSFET is latched off by pulling GATE down with 1.5mA
and FAULT is latched low. The waveform in Figure 6 shows
an unsuccessful start-up due to a short circuit at the output.
To ensure start-up, the load capacitor must be charged
up sufciently to exit current limit before the end of the
5ms blanking delay. For large load capacitors, it may be
necessary to connect an external capacitor from GATE to
GND as described in the Turn-On Sequence section.
After start-up, any transient overcurrent faults lasting
less than 100μs are ignored. Any overcurrent condition
lasting more than 100μs will initiate the 5ms ECB blank-
ing delay (time point t4). After the ECB blanking delay,
the ECB is armed for the following 5ms (time point t5 to
t6). Any 100μs overcurrent pulse during this time latches
off the MOSFET. In summary, for 5ms to 10ms after a
100μs or greater overcurrent fault is detected, a second
100μs fault condition causes the MOSFET to latchoff. If
no overcurrent condition is detected during this time, the
part re-enters the IDLE state and another blanking delay
following an overcurrent condition is again required before
the MOSFET latches off. Figure 7 shows how the output
latches off following an overcurrent fault.
During a severe short-circuit (see Figure 8), the output load
current can briey surge to tens of amperes. The LTC4224
rapidly brings the current under control by discharging
the MOSFET’s gate with 125mA towards ground. After a
short delay, the ACL amplier regulates the gate voltage
until the ECB trips at the end of 5ms.
Undervoltage Fault
An undervoltage fault occurs if either VCC1 or VCC2 falls
below 0.8V for longer than 8μs. This turns off the affected
supply’s switch by discharging GATE with 1.5mA and
clears its fault latch. An undervoltage fault on one supply
does not affect the operation of the other supply. If VCC,
the higher of VCC1 and VCC2, falls below 2.4V for more
than 12μs, all supply switches are turned off and all fault
latches are cleared.
Figure 6. Start-Up with Short at Output
5ms/DIV
ON1
2V/DIV
FAULT
5V/DIV
IOUT1
1A/DIV
GATE1
5V/DIV
422412 F06
Figure 8. Severe Short-Circuit on Output
0.5μs/DIV
IOUT2
8A/DIV
VOUT2
5V/DIV
GATE2
5V/DIV
422412 F08
Figure 7. Overcurrent Fault on Output
2ms/DIV
IOUT1
1A/DIV
VOUT1
5V/DIV
GATE1
5V/DIV
422412 F07
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4224CDDB-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Compact Dual Low Voltage Hot Swap Controller |
| LTC4224CDDB-2#TRMPBF | 功能描述:IC CNTRLR HOT SWAP DUAL 10-DFN 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) |
| LTC4224CDDB-2#TRPBF | 功能描述:IC CNTRLR HOT SWAP DUAL 10-DFN 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 |
| LTC4224CDDB-2-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Compact Dual Low Voltage Hot Swap Controller |
| LTC4224CDDB-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Compact Dual Low Voltage Hot Swap Controller |
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