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TPS23750EVM-108 PDF预览

TPS23750EVM-108

更新时间： 2024-11-15 12:33:11
品牌 Logo 应用领域
德州仪器 - TI 光电二极管控制器
页数 文件大小 规格书
41页 1523K
描述
INTEGRATED 100-V IEEE 802.3af PD AND DC/DC CONTROLLER

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TPS23750EVM-108 数据手册

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TPS23750  
TPS23770  
www.ti.com  
SLVS590B–JULY 2005–REVISED FEBRUARY 2008  
INTEGRATED 100-V IEEE 802.3af PD AND DC/DC CONTROLLER  
1
FEATURES  
DESCRIPTION  
2
•
Complete 802.3af PoE Interface  
–
–
–
–
Features derived from the TPS2375  
100 V, 0.6 Ω Internal Pass MOSFET  
Standard and Legacy UVLO Choices  
Fixed 140 mA Inrush Limit  
The TPS23750 integrates the functionality of the  
TPS2375 with a primary-side dc/dc PWM controller.  
The designer can create a front-end solution for  
PoE-PD applications with minimum external  
components. The TPS23770 is identical to the  
TPS23750 with the exception of the undervoltage  
lockout turn-on voltage, which is compatible with  
legacy systems.  
•
Primary Side DC/DC Converter Control  
–
–
–
–
–
–
–
Minimum External Component Count  
Current Mode Control  
The PoE front end has all the necessary IEEE  
802.3af functions including detection, classification,  
undervoltage lockout and inrush control. The PoE  
input switch is integrated within the TPS23750.  
Isolated and Non-Isolated Topologies  
Programmable Operating Frequency  
Current Sense Leading-edge Blanking  
50% Duty Cycle Limiting  
The dc/dc controller section is designed to support  
flyback, forward, and nonsynchronous low-side switch  
buck topologies.  
Voltage Output Error Amplifier  
•
•
•
Internal PoE and Converter Sequencing  
Industry-Standard 20 Lead Package  
The external switching MOSFET and current sense  
resistor provide flexibility in topology, power level, and  
current limit. The full-featured dc/dc controller  
includes programmable soft start, hiccup type fault  
limiting, 50% maximum duty cycle, programmable  
Industrial Temperature Range: –40°C to 85°C  
APPLICATIONS  
constant switching frequency,  
and  
a
true  
•
All PoE PD Devices Including:  
voltage-output error amplifier. Additional protection  
features provide for robust designs.  
–
–
–
Wireless Access Points  
VoIP Phones  
Security Cameras  
V
DD  
DET  
CLASS  
Low Voltage  
Isolated  
V
SS  
Output  
AUX  
COMP  
BL  
V
MODE  
BIAS  
V
BIAS  
V
BIAS  
FREQ  
TMR  
GATE  
RSP  
TLV431  
Figure 1. Typical Application  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
PowerPAD is a trademark of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005–2008, Texas Instruments Incorporated  
 
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