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參數(shù)資料
| 型號(hào)： | TPS2371PWRG4 |
| 廠商： | Texas Instruments |
| 文件頁(yè)數(shù)： | 18/19頁(yè) |
| 文件大小： | 0K |
| 描述： | IC PWR INTRFCE SW FOR POE 8TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 應(yīng)用： | 用于以太網(wǎng)供電（PoE）設(shè)備的電源接口開(kāi)關(guān) |
| 接口： | IEEE 802.3af |
| 封裝/外殼： | 8-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-TSSOP |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
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TPS2371
SLUS566A JULY 2003 REVISED NOVEMBER 2003
8
www.ti.com
APPLICATION INFORMATION
OVERVIEW
With the addition of power via media dependent interface (MDI) to the IEEE 802.3af Standard, all data terminal
equipment (DTE) now has the option to receive power over existing cabling that is used for data transmission.
The IEEE 802.3af Standard defines the requirements associated with providing and receiving power over the
existing cabling. The power sourcing equipment (PSE) provides the power on the cable and the powered device
(PD) receives the power. As part of the IEEE 802.3af Standard, the interface between the PSE and PD is defined
as it relates to the detection and classification protocol.
POWER SOURCING EQUIPMENT DETECTION OF A POWERED DEVICE
A powered device (PD) draws power or requests power by participating in a PD detection algorithm. This
algorithm requires the power sourcing equipment (PSE) to probe the link looking for a valid PD. The PSE probes
the link by sending out a voltage between 2.8 V and 10 V across the power lines. A valid PD detects this voltage
and places a resistance of between 23.75 k
and 26.25k across the power lines. Naturally, the current varies
depending on the input voltage. Upon detecting this current, the PSE concludes that a valid PD is connected
at the end of the ethernet cable and is requesting power.
If the powered device (PD) is in a state in which it does not accept power, the PD is required to place a resistance
above or below the values listed for a valid PD. On the lower end, a range between 12 k
and 23.75 k signifies
that the PD does not require power. On the higher end, the range is defined to be between 26.25 k
and 45
k
. Any resistance value less than 12 k and greater than 45 k, is interpreted by the PSE as a non-valid PD
detection signature.
The TPS2371 participates in the detection algorithm by activating an internal FET, which connects the DET pin
of the device to VEE. As a result, any resistance connected between VDD and the DET pin of the TPS2371 is,
in effect, across the power lines. This internal FET is active only when input power to the PD is between 2.8 V
and 10 V.
POWER SOURCING EQUIPMENT CLASSIFICATION OF A POWERED DEVICE
After the detection phase, the PSE can optionally initiate a classification of the PD. The classification of a PD
is used by the PSE to determine the maximum power required by the PD during normal operation. Five different
levels of classification are defined by the IEEE 802.3af Standard. These levels are shown in Table 2.
Table 2. Powered Device Classification Levels
CLASS
USAGE
POWER DEVICE
POWER
(W)
CLASSIFICATION
CURRENT
(mA)
MIN
MAX
MIN
MAX
0
Default
0.44
12.95
0
4
1
Optional
0.44
3.84
9
12
2
Optional
3.84
6.49
17
20
3
Optional
6.49
12.95
26
30
4
Not allowed
reserved for future use
36
44
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