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參數(shù)資料
| 型號(hào)： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數(shù)： | 25/44頁 |
| 文件大小： | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
Internal Bleed-Down Resistors and Bleed-Down Thresholds
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
The TPS2459 includes two features intended to support downstream loads that require removal and
reapplication of power to properly reset their internal circuitry. Disabling and re-enabling a channel of the
TPS2459 does not necessarily reset such a load because the capacitance attached to the output bus may not
fully discharge.
The TPS2459 includes two bleed-down comparators that monitor the OUT12 and OUT3 pins. The I2C interface
includes two bits (3DS and 12DS) that enable these comparators. Enabling a bleed-down comparator prevents
the corresponding channel from turning on until the output voltage drops below about 100 mV. This precaution
ensures that the output rail drops so low that all downstream loads properly reset.
In case the downstream load cannot quickly bleed-off charge from the output capacitance, the TPS2459 also
includes bleed-down resistors connected to each output rail through pins OUT12 and OUT3. Internal switches
connect these resistors from their corresponding rails to ground when the channels are disabled, providing that
one sets the appropriate bit in the I2C interface. These bits are named 12UV and 3UV. Clearing these bits
ensures that the corresponding resistors never connect to their buses.
If redundant supplies connect to an output, clear the corresponding bleed-down threshold and bleed-down
resistor bits. Failing to clear the bleed-down threshold bit prevents the channel from enabling, while the
redundant supply continues to hold up the output rail. Failing to clear the bleed-down resistor bit causes current
to continually flow through the resistor when the TPS2459 is disabled and the redundant supply holds up the
output bus.
Copyright 2009, Texas Instruments Incorporated
31
Product Folder Link(s): TPS2459
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| TPS2459RHBT | 功能描述:熱插拔功率分布 3V/12V Hot Swap & ORing Controller 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 |
| TPS2459RHBT | 制造商:Texas Instruments 功能描述:Hot Swap Controllers TI 制造商:Texas Instruments 功能描述:IC, HOT SWAP & O-RING CTRL, 23V, QFN-32 |
| TPS24700DGK | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller 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 |
| TPS24700DGKR | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller 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 |
| TPS24700EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS27400 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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