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| 型号： | LT4256-1CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 213K |
| 描述： | IC CTRLR HOTSWAP HV LATCH 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 10.8 V ~ 80 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： | 带卷 (TR) |
LT4256-1/LT4256-2
14
425612fa
APPLICATIO S I FOR ATIO
U
U
U
Figure 14. Negative Output Voltage Protection Diode Application
4256 F14
R5
0.033&
LT4256-1/
LT4256-2
SENSE
6
2
3
4
8
7
1
5
V
CC
GATE
FB
PWRGD
UV
TIMER
GND
V
IN
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241B
11V
R2
8.06k
R1
64.9k
R7
100&
R9
4.02k
R6
10&
R8
36.5k
V
OUT
R4
27k
C
L
100礔
C2
33nF
C3
0.1礔
C1
10nF
GND
D2
SMAT70A
D3
MRA4003T3
UV = 36V
PWRGD = 40V
Notes on Using the LT4256 in LT1641 Applications
Even though the LT4256 and LT1641 have the same
pinout, several changes were made to improve overall
system accuracy and increase noise immunity. These
changes are spelled out in Table 1 and must be accounted
for if using the LT4256 in an LT1641 application.
Layout Considerations
To achieve accurate current sensing, a Kelvin connection
to the current sense resistor (R5 in typical application
circuit) is recommended. The minimum trace width for
1oz copper foil is 0.02" per amp to make sure the trace
stays at a reasonable temperature. 0.03" per amp or wider
is recommended. Note that 1oz copper exhibits a sheet
resistance of about 530?/O. Small resistances can
cause large errors in high current applications. Noise
immunity will be improved significantly by locating resis-
tor dividers close to the pins with short V
CC
and GND
traces. A 0.1礔 decoupling capacitor from UV to GND is
also required.
Table 1. Differences Between LT1641 and LT4256
SPECIFICATION
LT1641
LT4256
COMMENTS
UV Threshold
1.313V
4V
Higher 1% Reference for Better Noise Immunity and System Accuracy
FB Threshold
1.233V
3.99V
Higher 1% Reference for Better Noise Immunity and System Accuracy
TIMER Current
?0%
?0%
More Accurate TIMEOUT
TIMER Shutdown V
1.233V
4.65V
Higher Trip Voltage for Better Noise Immunity
GATE I
PU
10礎
30礎
Higher Current to Accommodate Higher Leakage MOSFETs or Parallel Devices
GATE Resistor
1k&
100&
Different Compensation for Current Limit Loop
Foldback I
LIM
12mV
14mV
Slightly Different Current Limit Trip Point
I
LIM
Threshold
47mV
55mV
Slightly Different Current Limit Trip Point
Fault Latch Reset
1.233V
0.85V
Better Noise Immunity
Threshold Voltage
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| LT4256-1IS8 | 功能描述:IC CTRLR HOTSWAP HV LATCH 8SOIC 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 |
| LT4256-1IS8#PBF | 功能描述:IC CTLR HOTSWAP HV LATCH 8SOIC 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) |
| LT4256-1IS8#TR | 功能描述:IC CTRLR HOTSWAP HV LATCH 8SOIC 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 |
| LT4256-1IS8#TRPBF | 功能描述:IC CTRLR HOTSWAP HV LATCH 8SOIC 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 |
| LT4256-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Positive High Voltage Hot Swap Controllers |
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