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(yè)數(shù)： 31/32頁(yè)
文件大?。?/td> 621K
代理商： TPS2345PWNRND
TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 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 HEALTHY# output signal is pulled low to
allow enumeration of the add-in card.
To protect the backplane power bus, the TPS2345 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 –12-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 HEALTHY# output becomes high-impedance.
The TPS2345 can be reset by cycling either the BD_SEL# input or power to the device.
The low, 20-mV (150 mV on the –12-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 TPS2345 also turns off power in a controlled manner. To initiate
a shutdown, BD_SEL# is brought to a logic high during a HEALTHY# 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 TPS2345 goes into a low-current sleep mode.
相關(guān)PDF資料
PDF描述
TPS2346PWG4 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
TPS2350DRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
TPS2350PWG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
TPS2359RHHT 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC36
TPS2363PFBRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
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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