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| 型号： | TPS2390EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | EVAL MOD FOR TPS2390 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，热交换控制器 |
| 已用 IC / 零件： | TPS2390 |
| 已供物品： | 板 |
| 产品目录页面： | 1011 (CN2011-ZH PDF) |
| 相关产品： | TPS2390DGKRG4-ND - IC HOT SWAP PWR MGR 8-MSOP TPS2390DGKR-ND - IC HOT SWAP PWR MGR 8-MSOP TPS2390DGKG4-ND - IC HOT SWAP PWR MGR 8-MSOP 296-13511-5-ND - IC HOT SWAP PWR MGR 8-MSOP |
| 其它名称： | 296-20591 TPS2390EVM-ND |
SLUU150 – February 2003
4.3
Changing the Current Limit Threshold
During power-up of a plug-in card, the TPS2390 and TPS2391 limit the peak inrush current
drawn by the discharged bulk capacitance. The LCA senses load current as the drop across an
external sense resistor. Current is regulated by slewing the gate of the pass FET to maintain the
voltage drop at an internally set level, nominally 40 mV. Therefore, the peak current level can be
established by selecting the appropriate sense resistor value. On the – 48-V hot swap EVM, this
resistor is R4. The default value of R4 is 20 m ? . To modify the current limit threshold, a new
sense resistor value can be determined from Equation 1.
R4 v MAX
where
V
I MAX
(1)
?
?
V MAX is the sense voltage limit
I MAX is the desired current limit threshold
Using the device minimum value of 33 mV for V MAX along with the required minimum load
current ensures that minimum amount of current can always be supplied to the load. For
example, a particular line card is expected to draw a maximum of 1.2 A, when the power bus is
at its operating minimum level of – 36 V, once the card is powered up and operating normally. For
this load characteristic, a sense resistor value less than 33 mV/1.2 A, or 27 m ? , is selected. A
25-m ? resistor is the closest approximate standard value that is readily available. A
smaller-value resistor is also adequate, but carries a corresponding increase in the maximum
current limit.
4.4
Changing the Inrush Slew Rate
The TPS2390 and TPS2391 also feature slew rate limiting as current is ramped to charge the
load capacitance. The slew rate is easily programmed, once the sense resistor is determined,
with a small-value capacitor connected between the IRAMP and – VIN pins. The EVM comes
equipped with three preset capacitor values, selectable either individually or combined by
closing the appropriate DIP switches of SW1. The default values of the capacitors, and the
corresponding nominal slew rates, are given in Table 5.
Table 5. Default Slew Rates
SW1 DIP
1
2
3
REFERENCE
DESIGNATOR
C1
C2
C3
INSTALLED
VALUE
1000 pF
0.01 μ F
0.047 μ F
SLEW RATE
(A/s)
5000
500
106
The EVM can be used to illustrate the relationship between current limit, inrush slew rate, load
values, and the circuit ’ s fault timing requirements. With only DIP switch SW1 – 1 closed, the
fastest of the preset slew rates is selected, and only the hard-wired timing capacitor C9 is
connected to the TPS2390 or TPS2391 controller. However, this is sufficient to allow the bulk
capacitor C6 to fully charge, from 0 volts, across the full range of input supply voltages, down to
– 80 V. This can be observed by connecting input power as shown in Figure 3, displaying the
VOUT – node on an oscilloscope, and enabling the device.
Evaluation Modules for Simple – 48-V Hot Swap Controllers
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2391DGK | 功能描述:热插拔功率分布 Simple-48V Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2391DGKG4 | 功能描述:热插拔功率分布 Simple-48V Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2391DGKR | 功能描述:热插拔功率分布 Simple-48V Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2391DGKRG4 | 功能描述:热插拔功率分布 Simple-48V Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2391EVM | 功能描述:电源管理IC开发工具 Simple -48V Hot Swap Contr EVM RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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