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Home > Technology List > Texas Instruments' TPS2372_High-Power PoE PD Interface

Texas Instruments' TPS2372_High-Power PoE PD Interface

Published time: 2018-06-28

The main content of the article is:
1.The description of the TPS2372 
2.What is the TPS2372’s features
3.What is the TPS2372’s applications
4.The TPS2372’s datasheet information
5.A quick overview of PoE technology. 
6.What's the benefits of PoE Systems
Keywords:Texas Instruments'TPS2372|The TPS2372's features and applications|PoE technology

The description of the TPS2372 

TPS2372 is Texas Instrument important product,High-Power PoE Powered Device (PD) Interface with automatic MPS and Autoclass.The TPS2372 contains all the features needed to implement an IEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switch resistance allows the TPS2372-4 to support high power applications up to 90 W and 60 W, respectively. Assuming 100 meter CAT5 cable, this translates into 71.3 W and 51 W at PD input.

The TPS2372 operates with enhanced features.The automatic maintain power signature (MPS) function enables applications requiring very low power standby modes. The TPS2372 automatically generates the necessary pulsed current to maintain the PSE power. An external resistor is used to enable this functionality and to program the MPS pulsed current amplitude.

The TPS2372 also implements a delay function to allow the remote PSE to complete its inrush phase before releasing the power good (PG) output. This ensures that the IEEE802.3bt (draft) startup requirements are met.The Autoclass enable input also allows advanced system power optimization modes compliant with IEEE802.3bt (draft) standard.

What is the TPS2372’s features

1.IEEE 802.3bt (draft) PD solution for Type 3 or Type 4 PoE
2.Supports power levels for Type-4 (TPS2372-4) 90 W operation
3.Robust 100 V hot swap MOSFET
4.TPS2372-4 (typ.): 0.1 Ω, 2.2 A current limit
5.PG output with inrush completion delay
6.Compliant to PSE inrush

7.Allocated power indicator outputs:Automatic maintain power signature (MPS)|Auto-adjust MPS for Type 1-2 or 3-4 PSE

8.Supports ultra-low power standby modes
9.Supports autoclass operation
10.Supports PoE++ PSE
11.-40°C to +125°C junction temperature range
12.20-lead VQFN package

What is the TPS2372’s applications

• IEEE 802.3bt (Draft) Compliant Devices
• Lighting
• Power Modules
• Dual Signature PD/Forced UPOE
• 4PPOE
• Pass-through System
• Security Cameras
• Multiband access points
• Pico-base Stations

The TPS2372’s datasheet information

If you want to learn more information about TPS2372. You can view the  TPS2372’s datasheet, Jotrin Electronic provides download address for you.
TI's related product datasheet

Knowledge extension

A quick overview of PoE technology. 

It is a standards-based approach to deliver both power and data over Cat 5 ethernet cabling. The current standard transmits power over two of the four differential pairs within the ethernet cable. The original standard was published in 2003, called the IEEE 802.3af, which sourced 15.4 watts of power to the PD over 100 meters of cabling. The next standard in 2009, called the at standard, delivered more power to the PD-- 30 watts sourced, 25.5 watts delivered, also through 100 meters of ethernet cabling. 
The next standard set to release in 2018, called the IEEE 802.3bt, will source around 90 watts of power over all four pairs. These are also called 4-Pair or 4PPoE. Until the new standard is released, TI supports UPOE as an interim solution for greater than 25.5 watts delivered to the PD. 
PoE is a revolutionary technology that eliminates the need for electric power infrastructure, enabling quick and easy installation of powered devices (PDs) such as IP telephones, WLAN access points, security cameras, and other IP-based terminals. It allows PDs to receive power in parallel to data over the existing Ethernet infrastructure while keeping the structured cabling safe and not interfering with concurrent network operation.
Power over Ethernet (PoE)

What's the benefits of PoE Systems

• Reduce initial investment by eliminating separate data and power infrastructures
• Increase flexibility by installing access points and surveillance cameras in the most appropriate locations
• Optimize costs with remote shutdowns of access points when not in use
• Improve reliability with cost-effective centralized backup power
• Enhance safety by not using high-voltage power lines
• Reduce maintenance costs with remote infrastructure management
• Scale network easily and seamlessly by adding new devices as needed

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