TIDA-010034

IEEE802.3at Type-1 PoE and 12V adapter input to point of load reference design for IP network camera

TIDA-010034

Design files

Overview

Power over Ethernet (PoE) enables power to be delivered over the same ethernet cable as data with no danger of cross-talk, interference, or corruption of the data streams. This reference design showcases end-to-end power tree for an IP network camera powered using PoE or 12-V adapter based on the TI’s DaVinci™ Digital Media Processor or different application processor. The power tree also derives rails required for different peripherals of an IP network camera like: Image sensor, motor control, Ethernet PHY, RS485 interface, IR LED illumination, audio, motion sensing and the alarm interface.

Features
  • TPS23755 IEEE802.3at PoE PD with no-opto flyback DC-DC controller
    • Complete IEEE802.3at PD solution for type-1 PoE
    • Integrated flyback controller with primary side regulation (PSR), frequency dithering and advanced startup
    • 12-V output, 89% efficiency of the PoE-powered flyback power stage
    • Secondary side adapter priority control with smooth transition
  • No diode ORing: 88% less power dissipation in adapter input path with TPS2121 power MUX for secondary side ORing
  • Two power tree implementations:
    • For high efficiency: 12-V to PoL, using mid input range buck converters
    • For low cost: 12-V to 5-V to PoL, using low input range buck converters
  • Both power trees use buck converters with FPWM mode enabling:
    • Fast transient response for handling dynamic load switching on rails suppling power to MPU core and DDR RAM
    • Low output voltage ripple on voltage rails with tighter tolerances like MPU core and DDR RAM

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEI8.PDF (10126 K)

Reference design overview and verified performance test data

TIDRZ06.PDF (1024 K)

Detailed schematic diagram for design layout and components

TIDRZ07.PDF (83 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRZ08.PDF (1009 K)

Detailed overview of design layout for component placement

TIDRZ10.ZIP (6380 K)

Files used for 3D models or 2D drawings of IC components

TIDCFA7.ZIP (563 K)

Design file that contains information on physical board layer of design PCB

TIDRZ09.PDF (3280 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TLV625682.5V-5.5V input, 1A high efficiency step-down buck converter in SOT23 and SOT563 package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TLV62568A2.5V-5.5V input, 1A high efficiency step-down buck converter with forced PWM in small SOT563 package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TLV62569A2A High Efficiency Step-down Buck Converter with forced PWM in SOT Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS54202H4.5V to 28V Input, 2A Output, Synchronous Step-Down Voltage Converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS5612014.5V to 17V Input, 1A Synchronous Step-Down Voltage Regulator in 6-pin SOT-23

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS5612084.5V to 17V Input, 1A Output, Synchronous Step-Down Converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS5622014.5 V to 17 V input, 2 A output, synchronous step-down converter in Eco-mode

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS5622084.5 V to 17 V input, 2 A output, synchronous step-down converter in FCCM mode

Data sheet document-pdfAcrobat PDF open-in-new HTML
Illumination LED drivers

TPS542014.5V-to-28V Input Voltage, Synchronous Buck LED driver

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV742P200-mA low-IQ low-dropout (LDO) voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Power muxes

TPS21212.7-V to 22-V, 56-mΩ, 4.5-A, power mux with seamless switchover

Data sheet document-pdfAcrobat PDF
Powered devices

TPS23755IEEE 802.3at PoE PD with no-opto flyback DC-DC controller

Data sheet document-pdfAcrobat PDF
Sequencers

LM38803 Rail Simple Power Sequencer with Fixed Time Delay

Data sheet document-pdfAcrobat PDF

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Design guide IEEE802.3at type-1 PoE and 12-V adapter input to point-of-load reference design Feb. 12, 2019

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​

Videos