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| 型号： | LTC4211CS8 |
| 厂商： | Linear Technology |
| 文件页数： | 22/40页 |
| 文件大小： | 321K |
| 描述： | IC CONTROLLER HOT SWAP 8-SOIC |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.5 V ~ 16.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
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LTC4211
22
4211fb
OPERATION
SENSE RESISTOR CONSIDERATIONS
The fault current level at which the LTC4211s internal
electronic circuit breaker trips is determined by a sense
resistor connected between the LTC4211s V
CC
and SENSE
pins and two separate trip points. The first trip point is
set by the SLOW COMPs threshold, V
CB(SLOW)
= 50mV,
and occurs should a load current fault condition exist for
more than 20約. The current level at which the electronic
circuit breaker trips is given by Equation 8:
I
TRIP(SLOW)
=
V
CB(SLOW)
R
SENSE
=
50mV
R
SENSE
(8)
The second trip point is set by the FAST COMPs threshold,
V
CB(FAST)
= 150mV, and occurs during fast load current
transients that exist for 300ns or longer. The current level
at which the circuit breaker trips in this case is given by
Equation 9:
TRIP(FAST)
=
V
CB(FAST)
R
EN E
=
150mV
R
EN E
(9)
As a design aid, the currents at which the electronic circuit
breaker trips for common values for R
SENSE
are shown
in Table 3.
Figure 11. Making PCB Connections to the Sense Resistor
Table 2. t
SLOWCOMP
vs C
FILTER
C
FILTER
t
SLOWCOMP
100pF
82約
220pF
156約
330pF
224約
470pF
310約
680pF
440約
820pF
527約
1000pF
638約
Table 3. I
TRIP(SLOW)
and I
TRIP(FAST)
vs R
SENSE
R
SENSE
I
TRIP(SLOW)
I
TRIP(FAST)
0.005?/DIV>
10A
30A
0.006?/DIV>
8.3A
25A
0.007?/DIV>
7.1A
21A
0.008?/DIV>
6.3A
19A
0.009?/DIV>
5.6A
17A
0.01?/DIV>
5A
15A
For proper circuit breaker operation, Kelvin-sense PCB
connections between the sense resistor and the LTC4211s
V
CC
and SENSE pins are strongly recommended. The
drawing in Figure 11 illustrates the correct way of making
connections between the LTC4211 and the sense resis-
tor. PCB layout should be balanced and symmetrical to
minimize wiring errors. In addition, the PCB layout for the
sense resistor should include good thermal management
techniques for optimal sense resistor power dissipation.
The power rating of the sense resistor should accommodate
steady-state fault current levels so that the component is
not damaged before the circuit breaker trips. Table? in
the Appendix lists sense resistors that can be used with
the LTC4211s circuit breaker.
IRC-TT SENSE RESISTOR
LR251201R010F
OR EQUIVALENT
0.01, 1%, 1W
CURRENT FLOW
TO LOAD
CURRENT FLOW
TO LOAD
TO
V
CC
TO
SENSE
TRACK WIDTH W:
0.03" PER AMP
ON 1 OZ COPPER
W
4211 F11
CALCULATING CIRCUIT BREAKER TRIP CURRENT
For a selected R
SENSE
value, the nominal load current that
trips the circuit breaker is given by Equation 10:
TRIP(NOM)
=
V
CB(NOM)
R
EN E N M
=
50mV
R
EN E N M
(10)
The minimum load current that trips the circuit breaker is
given by Equation 11.
TRIP(MIN)
=
V
CB(MIN)
R
EN E MAX
=
40mV
R
EN E MAX
(11)
where
R
SENSE(MAX)
= R
SENSE(NOM)
1+
R
TOL
100
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
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相关代理商/技术参数 |
参数描述 |
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| LTC4211CS8#PBF | 功能描述:IC CONTROLLER HOT SWAP 8-SOIC 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 |
| LTC4211CS8#TR | 功能描述:IC CONTROLLER HOT SWAP 8-SOIC RoHS:否 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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| LTC4211IMS | 功能描述:IC CONTROLLER HOT SWAP 10-MSOP 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 |
| LTC4211IMS#PBF | 功能描述:IC CONTROLLER HOT SWAP 10-MSOP 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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