High-Power, High-Efficiency PoE PD and DC-to-DC Controller
Product details
Parameters
We are not able to display this information. Please refer to the product data sheet.Package | Pins | Size
Features
- Powers up to 30-W (Input) PDs
- DC-to-DC Control Optimized for Non-Isolated Converters
- Supports High-Efficiency Topologies
- Complete PoE Interface
- Enhanced Classification per IEEE 802.3at with Status Flag
- Adapter ORing Support
- Robust 100-V, 0.5-Ω Hotswap MOSFET
- –40°C to 125°C Junction Temperature Range
- Industry Standard PowerPAD TSSOP-24
Description
The TPS23785B is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-to-DC controller optimized specifically for non-isolated converters. The PoE interface supports the IEEE 802.3at standard.
The TPS23785B 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.
The PoE interface features the two-event, physical-layer 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-to-DC controller features two complementary gate drivers with programmable dead time. This simplifies design for highly-efficient flyback topologies utilizing secondary synchronous rectification. 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% 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.
Special note
Active – Limited TI design support
This product has limited direct TI design support for existing projects. If available, you can find relevant collateral and software on the product folder. For existing designs using this product, you may request support in the TI E2E support forums, but limited support is available for this product.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | High-Power, High-Efficiency PoE PD and DC-to-DC Controller datasheet (Rev. A) | Dec. 18, 2012 |
Application note | Lightning Surge Considerations for PoE Powered Devices | Apr. 30, 2015 | |
User guide | TPS23785BEVM-522 Evaluation Module | Apr. 25, 2014 | |
Application note | Efficiency-Optimized, Synchronous Flyback, High-Power PoE Controller/Converter | Jan. 17, 2012 | |
Application note | High Efficiency Class 4 PoE Powered Device | Mar. 23, 2011 | |
Application note | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | Feb. 09, 2009 | |
Application note | Designing an EMI Compliant PoE with Isolated Flyback | May 20, 2008 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Design files
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download PMP7819 BOM.pdf (108KB) -
download PMP8408 BOM.pdf (140KB) -
download PMP8408 Gerber.zip (314KB)
Design files
-
download PMP8454 BOM.pdf (21KB) -
download PMP8454 PCB.pdf (249KB) -
download PMP8454 Gerber.zip (320KB)
Design files
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download PMP8752 BOM.pdf (140KB) -
download PMP8752 Gerber.zip (314KB)
The flyback converter with synchronous reftifier provides excellent efficiency and small size for PoE (...)
Design files
-
download PMP8407 BOM.pdf (121KB) -
download PMP8407 PCB.pdf (225KB) -
download PMP8407 Gerber.zip (313KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
HTSSOP (PWP) | 24 | View options |
Ordering & quality
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- REACH
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- Ongoing reliability monitoring
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Support & training
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