參數(shù)資料
型號(hào)： TPS23753PW
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.505 A SWITCHING CONTROLLER, 273 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 823K
代理商： TPS23753PW
V
UVLO_R
Detection
Classification
PD Powered
Idle
V
CL_ON
V
CL_HYS
1.4V
V
CU_OFF
V
CU_HYS
Note: Variable names refer to Electrical Characteristic
Table parameters
V
VDD-VSS
V
UVLO_H
O
p
e
ra
ti
o
n
a
l
S
ta
te
SLVS853C – JUNE 2008 – REVISED JANUARY 2010
www.ti.com
Figure 17. Threshold Voltages
PoE Startup Sequence
The waveforms of Figure 18 demonstrate detection, classification, and startup from a type 1 PSE. The key
waveforms shown are VVDD-VSS, VRTN-VSS, and IPI. IEEE 802.3at requires a minimum of two detection levels;
however; four levels are shown in this example. Four levels guard against misdetection of a device when plugged
in during the detection sequence.
Figure 18. PoE Startup Sequence
Detection
The TPS23753 is in detection mode whenever VVDD-V SS is below the lower classification threshold. When the
input voltage rises above VCL_ON, the DEN pin goes to an open-drain condition to conserve power. While in
detection, RTN is high impedance, almost all the internal circuits are disabled, and the DEN pin is pulled to VSS.
An RDEN of 24.9 k (1%), presents the correct signature. It may be a small, low-power resistor since it only sees
a stress of about 5 mW. A valid PD detection signature is an incremental resistance between 23.75 k
and
26.25 k
at the PI.
14
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS23753
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS23753PW 制造商:Texas Instruments 功能描述:Controller IC
TPS23753PWG4 功能描述:熱插拔功率分布 PoE Interface & Iso Cnvrtr & 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
TPS23753PWR 功能描述:熱插拔功率分布 Interface and Iso Cnvrtr and 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
TPS23753PWRG4 功能描述:熱插拔功率分布 PoE Interface & Iso Cnvrtr & 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
TPS23754EVM-383 功能描述:電源管理IC開發(fā)工具 TPS23754 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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