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參數(shù)資料
| 型號： | TPS2345PWNRND |
| 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)： | 30/32頁 |
| 文件大小： | 621K |
| 代理商： | TPS2345PWNRND |
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TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 2002
7
www.ti.com
pin descriptions (continued)
VIN4: Channel 4 supply (–12-V) input voltage sense. This pin is connected to the –12-V power supply input
to the add-in card. The supply potential is tested against the undervoltage limits prior to ramping voltage to the
back-end –12-V plane. The input supply also serves as the reference potential for the internally generated
current limit (IMAX) reference of the Channel 4 LCA.
VS1, VS2, VS3: Voltage sense inputs for the positive back-end power busses. These pins connect to the source
nodes (load side) of the external pass FETs. After the programmed voltage ramp period for each supply, these
inputs are monitored to verify that the load voltages remain within the specified tolerances.
VS4: Voltage sense input for the negative back-end power bus. This pin connects to the drain (load side) of
the Channel 4 external pass FET. After the programmed voltage ramp period for the negative supply, this input
is monitored to verify that the load voltage remains within the specified tolerance.
functional overview
When an add-in CompactPCIR printed circuit board (PCB) is inserted into a live chassis slot, the discharged
supply bulk capacitance on the board can draw huge transient currents from the system supplies. Limited only
by the ESR of the bulk capacitors and the impedance of the interconnect, these transients can reach sufficient
magnitude to cause immediate damage to connector pins, PCB etch and plug-in and supply components, or
cause latent defects reducing long-term reliability. In addition, current spikes can cause glitches on the power
busses, causing other boards in the system to reset.
The TPS2345 is designed for use with the connector pin staging and insertion/extraction processes defined in
the CompactPCIR Hot Swap Specification, to enable full hot-swap capability in CompactPCIR add-in cards.
N–channel MOSFETs in series with each supply input provide isolation between the early power planes and
the back-end power planes during insertion and extraction events. Low ohmic-value sense resistors between
each input and pass MOSFET feed back current information to the device. The TPS2345 uses load current
sensing along with the peripheral slot enable command, BD_SEL#, to determine the appropriate gate drive
status for each of the four pass MOSFETs. In this manner, the device provides for the controlled application
of power to and removal from the back-end planes during hot swap.
When the add-in PCB is inserted into the slot, the long 5-V, 3.3-V and GND power pins make contact first (see
typical application diagram). At this stage of the insertion process, the TPS2345 precharge circuitry becomes
active, and biases the I/O pins to a nominal 1.0 V. Next, the medium length pins make contact, which includes
the 12-V, –12-V supplies, and the majority of the 5-V and 3.3-V supply pins. The TPS2345 derives VCC power
from the 12-V supply; however, the pull-up on the BD_SEL# input pin causes the device to maintain pull-downs
on the four gate pins, keeping the pass MOSFETs off. The short BD_SEL# pin is one of the last pins to mate;
at that point a logic low on the signal starts the turn-on of power to the back-end loads.
During a ramp-up sequence, the four supply inputs are validated against the pre-programmed undervoltage
(UV) and overvoltage (OV) thresholds. As each positive voltage load is enabled, current to the load is ramped
at a user-programmable rate, easily set by a capacitor on the current ramp control pin, IRAMP. The supplies
are sequenced up in the following order: 12-V, 5-V, 3.3-V and –12-V. The ramp of supply current on each
channel is limited to a maximum value, herein referred to as IMAX. The IMAX limit is individually selectable for
each channel, by selecting the appropriate value of the sense resistor. If the IMAX current level is attained on
any channel during an insertion, charging of that channel’s input bulk capacitance completes at that current limit,
as required.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2345PWR | 制造商:Rochester Electronics LLC 功能描述:COMPACTPCI HOT SWAP POWER MANAGER - Bulk |
| TPS2346PW | 功能描述:IC HOT SWAP POWER MGR 24-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| 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(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(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(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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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