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參數(shù)資料
| 型號： | TPS2341PHPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | POWERPAD, HTQFP-48 |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 649K |
| 代理商： | TPS2341PHPR |
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TPS2341
SLUS513A MAY 2003 REVISED JULY 2004
14
www.ti.com
APPLICATION INFORMATION
+5-V and +3.3-V Supply Controls
The TPS2341 provides the control circuitry for external N-channel power MOSFETs on the +5-V and +3.3-V
supplies. The switches share a common gate capacitor for slew rate control and have independent overcurrent
detection circuitry. A source side sense resistor provides a differential sense voltage to pins 5VSA and 5VISA
that is compared to a threshold voltage for the +5-V supply overcurrent fault. The +3.3-V supply operates
similarly and a fault on either supply shuts down the slot. The in-rush current of the supply is controlled in a
open-loop fashion by charging an external capacitor tied directly to the N-channel MOSFET gate with a constant
current source. This results in a linear voltage ramp on the gate and also on the load due to the source follower
connection of the switch.
The switch turns on when the logic declares the input supplies are valid, slot is healthy and the enable from the
I2C serial interface is active. The 3VISA and 5VISA pins are monitored for an undervoltage fault once the +12-V,
+5-V and +3.3-V switches are fully enhanced. The switch shuts off upon a disable command from the I2C serial
interface or a fault on the slot. An internal resistor connects between 3VISA and PWRGND1 and also between
5VISA and PWRGND1 upon disable and bleeds off any residual charge on the output.
Slot B functions independently and in the same manner as slot A.
3VAUX Supply Control
The TPS2341 integrates the power FETs for the 3.3 V auxiliary outputs providing power from V3IN when the
main supply is above 3 V and from the 3VSTBYIN supply when V3IN is below 3 V.
The 3VAUX circuit differs from the main circuits in regard to slew rate control. The main circuits slew rate is
programmable by an external capacitor while the 3VAUX slew rate is fixed. The 3VAUX outputs turn on and slew
up upon the application of 3VSTBYIN and SW. The slew rate is slow enough to allow charging a large bulk
capacitor (up to 150
F) without tripping the overload comparator. After the main supply inputs are active, the
3VAUX switch connected to 3VSTBYIN shuts off and the switch connected to V3IN turns on in a rapid
break-before-make fashion.
Upon the undervoltage failure of the V3IN or one of the positive main supplies, the V3IN switch shuts off and
the 3VSTBYIN switch turns on in a rapid break-before-make fashion. A high on the SW input shuts off the active
switch.
The V3IN switch has slew rate control slow enough to allow charging the bulk capacitance in the event that
3VSTBYIN and the main supplies become active together.
The V3IN switches have two overcurrent thresholds. The slow overcurrent threshold trips when the load current
exceeds 1 A for longer than 1 ms. The 3VAUX outputs can accomodate a transient current due to a load device
enable or charge up to 150
F of bulk capacitance without tripping a nuisance fault. The fast overcurrent
threshold trips when the load current exceeds 1.5 A for longer than 10
s. This threshold captures a direct short
on the 3VAUX output.
The 3VSTBYIN switches detect an overcurrent condition when the load current exceeds 40 mA for 25
s.
The main and standby faults are cleared by disabling the 3VAUX slot with the SW input or by removing the input
supply voltage.
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| TPS2342PFP | 功能描述:熱插拔功率分布 Hot Plug Power 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 |
| TPS2342PFPG4 | 功能描述:熱插拔功率分布 Hot Plug Power 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 |
| TPS2342PFPR | 功能描述:熱插拔功率分布 Hot Plug Power 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 |
| TPS2342PFPRG4 | 功能描述:熱插拔功率分布 Hot Plug Power 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 |
| TPS2343DDP | 功能描述:熱插拔功率分布 Dual Slot PCI-X 2.0 Hot-Plug Pwr Cntrlr 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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