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參數(shù)資料
| 型號： | TPS2383PMR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP64 |
| 封裝： | GREEN, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 28/28頁 |
| 文件大?。?/td> | 397K |
| 代理商： | TPS2383PMR |
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TPS2383
SLUS559B APRIL 2003 REVISED JULY 2004
9
www.ti.com
FUNCTIONAL DESCRIPTION
The TPS2383 architecture has been designed to work efficiently with simple low-cost controllers such as those
in the MSP430 family of devices. Reference design and code examples for complete PSE management are
available from TI for the TPS2383/MSP430 chipset solution.
The PSEPM discovery method, as defined in the IEEE 802.3af Standard, uniquely identifies a powered device
25-k
resistor. Use of low-level probe signals during discovery prevents damage to non-802.3 devices. The use
of a point-to-point slope detection method for the PD 25-k
resistor measurement allows accurate detection,
even if series steering diodes are present at the PD. For legacy loads, capacitive detection can be enabled. In
this mode the TPS2383 A/D is used to measure the loads capacitive value.
After a successful discovery of the PD, the TPS2383 has a classification feature to identify the expected PD
power level based on a current signature from the PD. The classification current level is measured at a reduced
terminal voltage of 17.5 V and classified with 12 bits of resolution. The controller can then use this information
to classify per the levels of the IEEE 802.3af standard or use levels custom to the application. Knowledge of
the expected load power allows the power sourcing equipment to be built with a smaller and less expensive
system power supply. For installations where classification is not needed, and reduced power-up time is
desired, classification can be bypassed by setting the appropriate bits in the per-port write register.
In classification and powered modes, the PSEPM drives an external low side N-channel MOSFET for control
of the 48-V return line. The use of an external N-channel MOSFET enables selection of very low RDS(on) devices
to minimize board power dissipation in enclosures that may be controlling 100’s of ports. Current sensing is
performed with a low value resistor, again minimizing board power dissipation. In discovery mode, due to the
very low current used, an internal N-channel MOSFET is utilized in conjunction with an external, high value,
current sense resistor.
The TPS2383 identifies all fault conditions defined in the PoE IEEE 802.3af Standard. The monitored conditions
include input undervoltage lockout (UVLO), output undervoltage (UV) and overvoltage (OV), average and peak
overcurrent detection, average undercurrent detection, and run current. If a fault condition is detected during
power ramp or at any other time, the PSEPM circuit breaks by disconnecting the 48-V return line and then
updates the fault status of the corresponding port register. When the TPS2383 is disabled the PSEPM ramps
the current down at a controlled rate and the PSEPM changes states to a lower power sleep mode.
To maintain full compliance to Underwriters Laboratory (UL), IEC950 SELV and NEMKO safety standards an
optional, low cost self-resetting PTC fuse can be added to the unswitched +48-V line to protect the system
supply and wiring infrastructure from secondary building wiring faults.
When the PSEPM is enabled and a PD is discovered and optionally classified, power is ramped to the PD at
a controlled current ramp rate to reduce EMI. Upon completion of the current ramp up, the port current remains
limited at less than 400 mA. Upon startup the port can remain in current limit for a timed value of 50 ms which
allows the bulk filter capacitance of the PD to charge. Once a PD is successfully powered and the external
N-channel MOSFET is fully on, the average and peak current to the PD is continuously monitored. A
disconnected load is detected if the average current falls below 10 mA. An overcurrent is detected if the average
current exceeds 375 mA and/or the peak current exceeds 425 mA. If any of these conditions exist, status bits
are set in the per-port read register set and the power is removed from the load.
For maximum rejection of external wiring and power supply noise sources during the measurement of line
current, voltage, resistance or capacitance in discovery, classification and powered modes, a proprietary low
noise A/D converter is used. Converted measurements are processed and compared with digital set-points for
limit compliance. The 12-bit conversion of this data-acquisition system is available through the read register
enabling measurement of the discovery resistance, classification current and powered mode port running
current and voltage. This is a valuable feature in ethernet switch management as it allows monitoring of real-time
parameters across the system network.
The TPS2383 is available in a full function 64 pin LQFP package.
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| TPS2383PMRG4 | 功能描述:熱插拔功率分布 Pwr Over Ethernet Sw Side Manager 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 |
| TPS23841PAP | 功能描述:熱插拔功率分布 HP Wide Volt Range Quad Part Ethernet 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 |
| TPS23841PAPG4 | 功能描述:熱插拔功率分布 HP Wide Volt Range Quad Part Ethernet 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 |
| TPS23841PAPR | 功能描述:熱插拔功率分布 HP Wide Volt Range Quad Part Ethernet 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 |
| TPS23841PAPRG4 | 功能描述:熱插拔功率分布 HP Wide Volt Range Quad Part Ethernet 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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