参数资料
型号: TPS2371PWG4
厂商: Texas Instruments
文件页数: 15/19页
文件大小: 0K
描述: IC PWR INTRFCE SW FOR POE 8TSSOP
标准包装: 150
应用: 用于以太网供电(PoE)设备的电源接口开关
接口: IEEE 802.3af
封装/外壳: 8-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 8-TSSOP
包装: 管件
安装类型: 表面贴装
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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