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)： 13/32頁(yè)
文件大?。?/td> 621K
代理商： TPS2345PWNRND
TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 2002
20
www.ti.com
APPLICATION INFORMATION
A turn-on sequence is initiated when the BD_SEL# input is brought low (less than 0.8 V), assuming that all four
input supplies (at the VINx pins) are within their UV/OV tolerance windows. A voltage fault at any input supply
causes all loads to be held off. When BD_SEL# is asserted, the Channel 1 amplifier is enabled, and a 58-
A
current source begins charging the IRAMP capacitor to generate the first IRAMP pulse. During the linear rising
edge portion of the IRAMP waveform, current is linearly ramped to the 12-V back-end plane. Once the voltage
at IRAMP reaches 1.5 V, the source is replaced with a 1.8-
A sink that discharges IRAMP to 0 V. During this
discharge period, load charging current, if still required, is limited to IMAX, the current sense voltage (VMAX)
divided by the sense resistor value, RSNSx, or IMAXx = VMAXx / RSNSx, where “x” refers to any of the four
channels.
At the completion of the first pulse on IRAMP, the TPS2345 moves to the second voltage to be ramped up,
Channel 2, enables its LCA and begins generating the second pulse in the IRAMP train. At this time, fault
monitoring is enabled on the Channel 1 output. Therefore, if Channel 1 has failed to attain at least the
undervoltage threshold potential, a fault is detected, any active channels turned off, and the turn-on sequence
aborted. In this manner, the maximum time allowed for ramp-up of any of the channels is the duration of one
(1) IRAMP pulse. This protects against indefinite sourcing into faulted loads. The TPS2345 latches off in
response to faults, and can be reset either by toggling the BD_SEL# input high and then low again, or by cycling
power to the device.
After the Channel 2 ramp pulse, the back–end planes for Channel 3 and Channel 4 are ramped up in similar
fashion. Channel 2 fault detection is enabled at the start of the Channel 3 ramp pulse, and so on. Once all four
supplies are ramped up, Channel 4 fault detection is enabled on the fifth IRAMP pulse. This last pulse is of
relatively short duration, as charge and discharge currents of approximately 256
A are selected for the UV/OV4
enable pulse. If all four channels reach a known good state, the HEALTHY# output is asserted low.
Each load current waveform, at load turn-on, may have up to three distinct periods, as shown in Figure 20.
Initially after being enabled, the ramp generator output voltage is clamped to less than 100 mV. This results in
a corresponding clamp on load current of about 7% of the programmed IMAX value (with some variance due
to internal device offset). This temporary limit applies during approximately the first 500
s of output ramping
time. The purpose of this slow ramp period is to ensure the LCA is pulled out of saturation, and is closely tracking
the CS input, prior to enabling fast charging of the load. During this time, appreciable ramping of the back-end
voltage may or may not occur, depending on a number of factors including the IMAX value, the amount of bulk
capacitance on the load, and the magnitude and polarity of inherent offsets in the current control loop.
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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