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參數(shù)資料
| 型號(hào)： | 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)： | 10/32頁 |
| 文件大?。?/td> | 621K |
| 代理商： | TPS2345PWNRND |
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TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 2002
18
www.ti.com
APPLICATION INFORMATION
The connections to set up the TPS2345 for operation in a CompactPCIR plug-in are shown in the typical
application diagram.The TPS2345 works in conjunction with four external N-channel MOSFETs to provide
isolation of the back-end power planes when disabled, and to provide a low-impedance power path when the
load voltages are at the full-input dc potential. For proper operation, each channel of the device must be
connected to the appropriate supply as listed in Table 1.
Table 1. TPS2345 Channel to cPCIR Supply Connections
TPS2345 CHANNEL
cPCIR SUPPLY
1
12 V
2
5 V
3
3.3 V
4
–12 V
Sense resistors R1 through R4 connect between the VINx and CSx pins of their respective supplies, and
provide load current magnitude information to the TPS2345. To turn on the negative voltage channel, the device
pulls the gate of MOSFET Q4 towards ground potential. Resistor R5 provides a gate pull down when the LCA
turns off, as the Channel 4 LCA does not drive to the negative rail.
Capacitors C1 through C4 provide decoupling at the plug-in power pins, and are required by the CompactPCIR
hot swap specification. For the 5-V and 3.3-V supplies, the specification recommends an average value of
between 0.1
F and 0.2 F per 10 pins. This capacitance may be distributed along the connector, or provided
as a single chip on each supply. Since there are eight 5-V and ten 3.3-V power pins at each backplane slot, two
0.1-
F ceramic capacitors meet this requirement. The ±12-V supplies should also be decoupled as shown.
All four capacitors should be placed close to the J1 connector, with trace length less than or equal to 0.6 inch.
Resistor R7 provides the 1.2-k
pull-up on the BD_SEL# pin required by the hot swap specification. The pull-up
resistor is shown connected to the early 5-V plane; alternatively, it could be connected to early VIO. Resistor
R6 provides a pull-up to early VIO on the HEALTHY# signal; a 10-k
resistor should suffice.
A capacitor with a value between 0.1
F and 1 F (C6 in the diagram) is required between the CPUMP pin and
ground. This capacitor provides charge storage for the on-board charge pump. A 0.1-
F ceramic is sufficient
for most applications.
ramp-up sequence
A successful ramp-up of the four cPCIR back-end supplies consists of five pulses on the TPS2345 IRAMP pin.
One load voltage is ramped up during each of the first four IRAMP pulses. The fifth pulse enables the fault logic
of the last channel (Channel 4) to turn on. This is shown graphically in Figure 19.
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相關(guān)代理商/技術(shù)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(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):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(yīng)商設(shè)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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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