參數(shù)資料
型號: TPS2371D
廠商: Texas Instruments
文件頁數(shù): 15/19頁
文件大?。?/td> 0K
描述: IC PWR INTRFCE SW FOR POE 8-SOIC
標準包裝: 75
應用: 用于以太網(wǎng)供電(PoE)設備的電源接口開關
接口: IEEE 802.3af
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 8-SOIC
包裝: 管件
安裝類型: 表面貼裝
產(chǎn)品目錄頁面: 1013 (CN2011-ZH PDF)
其它名稱: 296-15960-5
TPS2371
SLUS566A JULY 2003 REVISED NOVEMBER 2003
5
www.ti.com
DETAILED PIN DESCRIPTIONS (continued)
EN_DC (Pin 6)
Enable pin for the load. This pin is intended to be used with a dc-to-dc coverter with a soft start capacitor. When
power is not available to the dc-to-dc converter, this pin sinks 80-
A and hold off the softstart cap on the dc-to-dc
converter. Once the voltage across the load is within 1.5 V of its final value, the EN_DC pin stops drawing current
and become high impedance, allowing the dc-to-dc to soft start normally.
DELAY (Pin 7)
This pin controls the amount of time that the device ignores an undervoltage condition on VDD. That time is set
by the following equation:
T
DELAY +
100 ms
mF
C
DELAY
VDD (Pin 8)
Positive supply to the device.
Table 1. PoE Classification Resistance Values
CLASS
RESISTANCE
(RCLASS) VALUE ()
POWERED DEVICES
(PDs) Power (W)
CLASSIFICATION
CURRENT (mA)
0
4420
0.44 12.95
2.5
1
953
0.44 3.84
10.8
2
549
3.84 6.49
18.6
3
357
6.49 12.95
28.4
4
255
reserved for future use
39.6
(2)
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