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TPS23756
Class 4 PoE PD with flyback/forward DC-DC controller & 12V-57V adapter support
Data sheet
TPS23756
- Powers up to 30-W (Input) PDs
- DC-DC Control Optimized for Isolated Converters
- Supports High-Efficiency Topologies
- Complete PoE Interface
- 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™ HTSSOP-20
The TPS23754 and TPS23756 devices have 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 and TPS23756 support 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.
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.
The DC-DC controller features two complementary gate drivers with programmable dead time. This simplifies the 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 soft start, bootstrap start-up source, current-mode compensation, and a 78% 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 a default period, simplifies the usual current-sense filter design trade-offs.
The TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-V converter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.
Technical documentation
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View all 12 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) | PDF | HTML | 19 Dec 2017 |
| Application note | PoE Powered Devices Debug Guidelines | PDF | HTML | 19 Jul 2021 | |
| Application note | PoE PD Schematic Review Guidelines | PDF | HTML | 29 Apr 2021 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Lightning Surge Considerations for PoE Powered Devices | 30 Apr 2015 | ||
| Application note | Implementing a Buck Converter With the TPS23753A | 20 Sep 2010 | ||
| Application note | Using the TPS23753A with an External Error Amplifier | 06 Aug 2010 | ||
| EVM User's guide | TPS23756EVM User's Guide (Rev. A) | 01 Apr 2010 | ||
| Application note | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 09 Feb 2009 | ||
| Application note | PoE Powered Device for 24 VAC Building Power Applications | 10 Sep 2008 | ||
| Application note | Designing an EMI Compliant PoE with Isolated Flyback | 20 May 2008 | ||
| Application note | Practical Guidelines EMI Compliant PoE | 27 Mar 2008 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
TPS23756EVM — TPS23756EVM: Evaluation Module for TPS23756
The TPS23756EVM contains evaluation and reference circuitry for the TPS23756, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23756 is targeted at wide Vin aplications (12 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3 at Power over Ethernet (PoE) (...)
User guide: PDF
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs
PMP40514 — Class 3 isolated high-efficiency active clamp flyback converter for PoE power reference design
This reference design is developed for evaluating 13-W isolated active clamp flyback PD converter system using the IEEE 802.3at PoE interface and DC/DC controller TPS23756. The converter is capable of supporting the 13-W maximum IEEE 802.3at power requirements. It presents good efficiency, load (...)
Reference designs
TIDA-00091 — Class 4 - Wide Input Range 15W Power over Ethernet (PoE) Converter
Note: TIDA-00091 was implemented using hardware from PMP6659.
The Class 4 – Wide Input Range, 15W Power over Ethernet (PoE) Converter reference design is intended as an evaluation module for users to develop end-products for IP security camera applications. This reference design has been (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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