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TPS23754_10

更新时间： 2024-11-15 11:49:31
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德州仪器 - TI 控制器
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41页 1407K
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High Power/High Efficiency PoE Interface and DC/DC Controller

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TPS23754_10 数据手册

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TPS23754  
TPS23754-1  
TPS23756  
www.ti.com  
SLVS885D –OCTOBER 2008–REVISED DECEMBER 2009  
High Power/High Efficiency PoE Interface and DC/DC Controller  
1
FEATURES  
The TPS23754/6 supports a number of input voltage  
ORing options including highest voltage, external  
adapter preference, and PoE preference. These  
features allow the designer to determine which power  
source will carry the load under all conditions.  
2
•
Powers up to 30 W (input) PDs  
•
DC/DC Control Optimized for Isolated  
Converters  
•
•
•
Supports High-efficiency Topologies  
Complete PoE Interface  
The PoE interface features the new extended  
hardware classification necessary for compatibility  
with high-power midspan power sourcing equipment  
(PSE) per IEEE 802.3at. The detection signature pin  
can also be used to force power from the PoE source  
off. Classification can be programmed to any of the  
defined types with a single resistor.  
Enhanced Classification per IEEE 802.3at with  
Status Flag  
•
•
Adapter ORing Support  
Programmable Frequency with  
Synchronization  
•
•
•
Robust 100 V, 0.5 Ω Hotswap MOSFET  
–40°C to 125°C Junction Temperature Range  
Industry Standard PowerPAD™ TSSOP-20  
The dc/dc controller features two complementary gate  
drivers with programmable dead time. This simplifies  
design of active-clamp forward converters or  
optimized gate drive for highly-efficient flyback  
topologies. The second gate driver may be disabled if  
desired for single MOSFET topologies. The controller  
also features internal softstart, bootstrap startup  
source, current-mode compensation, and a 78%  
APPLICATIONS  
•
•
•
•
•
IEEE 802.3at Compliant Devices  
Video and VoIP Telephones  
RFID Readers  
Multiband Access Points  
Security Cameras  
maximum duty cycle.  
A
programmable and  
synchronizable oscillator allows design optimization  
for efficiency and eases use of the controller to  
upgrade existing power supply designs. Accurate  
programmable blanking, with  
simplifies the usual current-sense filter design  
trade-offs.  
a
default period,  
DESCRIPTION  
The TPS23754/6 is a combined Power over Ethernet  
(PoE) powered device (PD) interface and  
current-mode dc/dc controller optimized specifically  
for isolated converters. The PoE interface supports  
the IEEE 802.3at standard.  
The TPS23754 has a 15 V converter startup while the  
TPS23756 has  
a 9 V converter startup. The  
TPS23754-1 replaces the PPD pin with a no-connect  
for increased pin spacing.  
CIO  
T1  
VOUT  
CIN  
LOUT  
M4  
RT2P-OUT  
T2P  
DVC1  
DEN  
CLS  
RT2P  
VC  
COUT  
VT2P-OUT  
LVC  
M3  
N/C OR PPD  
PAD  
DVC2  
Type 2 PSE  
Indicator  
M1  
VB  
GATE  
CS  
VSS  
CC  
VB  
RCTL  
APD  
CTL  
FRS  
ROB  
CIZ  
M2  
CCTL  
DA  
GAT2  
CCL  
RAPD1  
DCL  
TLV431  
RDT  
Optional  
Interface  
Figure 1. High Efficiency Converter Using TPS23754  
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 © 2008–2009, Texas Instruments Incorporated  
 
 
 
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