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參數(shù)資料
| 型號： | TPS2346PWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | GREEN, TSSOP-24 |
| 文件頁數(shù)： | 29/30頁 |
| 文件大?。?/td> | 490K |
| 代理商： | TPS2346PWG4 |
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TPS2346
SLUS529 – MAY 2002
8
www.ti.com
functional overview (continued)
As each back-end voltage is ramped, its level is validated to ensure it is within the established UV and OV
tolerances at the expiration of a programmable time period, protecting against start-up into faulted loads. The
same capacitor at the IRAMP pin which sets the current ramp rate is also used to establish this ramp-up time
limit. If all four supplies successfully reach a known good state, the PG output signal is pulled low to allow
enumeration of the add-in card.
To protect the backplane power bus, the TPS2346 provides an electronic circuit breaker that trips upon detecting
an overcurrent event. The detection threshold of an overcurrent event is internally set to approximately two
times (2x) IMAX. The –5.2-V channel also includes a circuit breaker function; its trip threshold is always a
minimum of 50 mV above the current-limit sense voltage. If any channel trips the circuit breaker, all supply
outputs are rapidly turned off, and remain latched off. Also, the PG output becomes high-impedance. The
TPS2346 can be reset by cycling either the ENABLE input or power to the device.
The low, 20-mV (150 mV on the –5.2-V channel) nominal sense voltage limit allows the use of low-value sense
resistors, or for high-current applications, the use of PC board copper trace. This helps minimize the insertion
loss across the hot swap interface. Further insertion loss reduction is achieved via the on-chip charge pump,
which ensures maximum gate overdrive on each of the three external pass MOSFETs on the positive supply
channels. This feature helps users obtain lower RDS(on) characteristics with their preferred N-channel
MOSFETs.
Under a normal PC board shutdown event, the TPS2346 also turns off power in a controlled manner. To initiate
a shutdown, ENABLE is brought to a logic high during a healthy supply state (outputs on and no faults present).
The supply outputs are then sequentially ramped off in the reverse order of the ramp-up sequence. After all
supply outputs are off, the TPS2346 goes into a low-current sleep mode.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2346PWR | 功能描述:熱插拔功率分布 Optical Network Hot Swap Controller RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2346PWRG4 | 功能描述:熱插拔功率分布 Optical Network Hot Swap Controller RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350D | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350DG4 | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350DR | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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