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| 型号： | TPS2390EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 14/16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
To observe the controller response to a load that does not charge up as expected (a shorted or
otherwise excessive load), set switches SW1 – 1, SW1 – 2, and SW1 – 3 to the ON position. This
greatly reduces the inrush (load charging) current slew rate at turn-on, with a corresponding
increase in the amount of time needed to successfully charge the intended load. Increase the
supply level to between approximately 60 V and 80 V, and again enable the device. In this case,
the voltage ramp time is excessively long relative to the programmed fault timer; the controller
times out and turns off the load (1) . This can be seen from the illumination of the red FAULTED
LED. (When evaluating the TPS2391, the LED may flash briefly then turn off, indicating
capacitor charging ultimately completed on a successive retry.) If this combination represented
the parameters of the target plug-in module, then the timing capacitance of C9 and C4 (SW1 – 4
closed) would be more appropriate. The intended load, in this case, the 100- μ F capacitor, can
again be charged up over the input voltage range.
The inrush slew rate can be changed, to better match the application requirement, by replacing
any capacitor C1, C2 or C3. The PCB patterns are sized for 0805 ceramic chip capacitors. Use
equation 2 to calculate the new ramp capacitor, C RAMP , value in microfarads.
C RAMP +
100
11
R4
di
dt MAX
(2)
where
?
?
R4 is the selected sense resistor value, in ohms
(di/dt) MAX is the desired maximum slew rate, in amperes/second.
4.5
Fault Timing with the TPS2390/TPS2391
Whenever the hot swap controller is limiting current to the load, an on-chip timer is monitoring
this operation against an established time limit. The timeout period is generated by the
constant-current charging of a capacitor at the FLTTIME pin. If current regulation ceases prior to
expiration of the timer, the capacitor is discharged, and normal steady-state operation of the load
either starts or resumes. However, if the timer expires, then the pass FET is turned off, disabling
power to the load, and the FAULT output is asserted.
On the – 48-V hot swap EVM, several capacitor patterns are provided for increasing or otherwise
modifying the timeout period. Capacitor C9 is hard-wired to the device FLTTIME pin, and
provides a minimum fault timer for the default load. C4 and C5 can be switched into the circuit
via DIP switches SW1 – 4 and SW1 – 5, respectively. The EVM ships from the factory with a
0.1- μ F capacitor installed at C4; C5 is not populated for easier subsequent user modification as
required.
(1) Due to tolerances of various EVM parameters, some units may not fault out under these conditions. Generally, this is due to the fact that the
amount of voltage ramping during the reduced-rate turn-on period will vary from device to device. Some units may be able to charge the load
almost completely during this period, when fault timing is inhibited. A more severe load fault is needed to view the fault response. Additional
capacitance, or even a resistor, can be connected across the VOUT terminals, J3(+) and J4( – ) or at C7. If the user is confident the module
is operating correctly, the load can also be shorted out to do this.
14
Evaluation Modules for Simple – 48-V Hot Swap Controllers
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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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