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參數(shù)資料
| 型號： | TPS2350EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TPS2350 -48V Hot Swap/Supply Selector Evaluation Module(’-48V熱交換/電源選擇器TPS2350的評估板) |
| 中文描述： | TPS2350 - 48V熱插拔/供應(yīng)選擇評估模塊（\u0026#39;- 48V的熱交換/電源選擇器TPS2350的評估板） |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 375K |
| 代理商： | TPS2350EVM |
SLUU171A - September 2003
17
TPS2350 48-V Hot Swap/Supply Selector Evaluation Module
The EVM can be used to get an illustration of the relationship between current limit, inrush slew rate, load values,
and the circuit’s fault timing requirements. With DIP switch SW11 only closed, the fastest of the preset slew
rates is selected, and only the hard-wired timing capacitor C6 is connected to the TPS2350 controller. However,
this is sufficient to allow the bulk capacitor C8 to fully charge, from 0 V, across the full range of input supply
voltages, down to 80 V. This can be observed by connecting input power as shown in Figure 4, displaying the
VOUT node on an oscilloscope, and enabling the device.
To observe the controller response to a load that does not charge up as expected (a shorted or otherwise
excessive load), set switches SW11, SW12, and SW13 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 about 60 V to 72 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 LED. (The LED
may only flash briefly then turn off, indicating load charging ultimately completed on a successive retry.) If this
combination represented the parameters of the target plug-in module, then the timing capacitance of C6 and
C4 (SW14 closed) would be more appropriate. The intended load, in this case, the 100-
μ
F capacitor, can again
be charged up on the first attempt, for supply values across the input voltage range.
NOTE: (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, J4(+) and J5() or at C9. If the
user is confident the module is operating correctly, the load can also be shorted out to do
this demonstration.
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.
11.3
100
R5
di dt
MAX
C
RAMP
where:
R5 is the selected sense resistor value, in ohms, and
(di/dt)
MAX
is the desired maximum slew rate, in amps/second.
(2)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2350PW | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350PW | 制造商:Texas Instruments 功能描述:HOT SWAP CONTROLLER ((NW)) 制造商:Texas Instruments 功能描述:IC, HOT SWAP POWER MANAGER, 14-TSSOP |
| TPS2350PWG4 | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350PWR | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350PWRG4 | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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