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参数资料
| 型号： | LTC4223IDHD-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 290K |
| 描述： | IC CNTRLR HOT SWAP DUAL 16-DFN |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | ATCA，MicroTCA? |
| 内部开关： | 无 |
| 电源电压： | 2.7 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x4） |
| 包装： | 带卷 (TR) |
LTC4223-1/LTC4223-2
13
422312f
APPLICATIONS INFORMATION
As the TIMER capacitor is used for fault ltering during
power-up for both the auxiliary and 12V supplies, only
one supply can be started up at any one time. The other
supply waits until the power-good signal is generated by
the powering-up supply and the TIMER pin voltage falls
below 0.2V. By default, the 3.3V auxiliary supply starts up
rst if both AUXON and 12ON are high at the end of the
debounce cycle.
Whenever both AUXON and 12ON are pulled low, the de-
vice is in reset mode and TIMER capacitor is discharged
to ground by an 8mA current sink.
Thermal Shutdown
The internal 3.3V auxiliary supply switch is protected by
thermal shutdown. If the switchs temperature reaches
150癈, the aux switch will shut off immediately and
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T
will pull low. The external 12V supply switch also turns
off. The switches are allowed to turn on again by cycling
both the AUXON and 12ON pins low then high after the
internal switchs temperature falls below 120癈.
Overcurrent Fault
The LTC4223 features an adjustable current limit with circuit
breaker function that protects the external MOSFET against
short circuits or excessive load current on 12V supply. The
voltage across the external sense resistor is monitored by
the analog current limit (ACL) ampli er and the electronic
circuit breaker (ECB) comparator. If an overcurrent fault
occurs that causes the sense voltage to reach the ACL
threshold (60mV), the ACL ampli er regulates the MOSFET
to prevent any further increase in current. This overcurrent
condition results in a sense voltage that exceeds the ECB
threshold. As a result, the TIMER capacitor is charged
by a 200糀 current. If the condition persists, the TIMER
pin voltage will reach its threshold (1.235V). When this
occurs, the
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T pin pulls low and a 1mA current pulls
the GATE pin to ground causing the MOSFET to turn off.
The circuit breaker time delay, the time required for the
TIMER pin capacitor to charge from ground to the TIMER
pin threshold, is given by C
T
" 6[ms/糉].
After the MOSFET turns off, the TIMER pin capacitor dis-
charges with a 2糀 pull-down current. For the auto-retry
version (LTC4223-2), if the TIMER discharges to below
0.2V, a new start-up cycle will begin. The TIMER starts
ramping up and clears faults when it exceeds 1.235V;
thereafter it ramps down (see the section on Auto-Retry
for details). Figure 5 shows an overcurrent fault on the
12V output.
In the event of a severe short-circuit fault on 12V output
as shown in Figure 6, the output current can surge to
tens of amperes. The LTC4223 responds within a very
short time to bring the current under control by pulling
the MOSFETs GATE-to-SOURCE pin voltage down to zero
volts. Thereafter, the GATE of the MOSFET recovers rapidly
due to the R
G
/C
G
compensation network and enters into
active current limiting until the TIMER times out. Due to
parasitic supply lead inductance, an input supply without
any bypass capacitor will collapse during the high cur-
rent surge and then spike upwards when the current is
interrupted. An input supply transient protection network
comprising of Z1, R1 and C1 shown in Figure 13 is recom-
mended if there is no input capacitance.
Figure 5. Overcurrent Fault on 12V Output
0.1ms/DIV
12V
GATE
5V/DIV
FAULT
5V/DIV
12V
OUT
5V/DIV
422312 F05
I
LOAD
5A/DIV
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4223IGN-1#PBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-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) |
| LTC4223IGN-1#TRPBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-SSOP 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 |
| LTC4223IGN-1PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4223IGN-1TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4223IGN-2#PBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-SSOP 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 |
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