IEEE 802.3at PoE interface and isolated converter controller
Product details
Parameters
Package | Pins | Size
Features
- 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
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Description
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
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) | Dec. 19, 2017 |
| User guide | TPS23754EVM-383 EVM: Evaluation Module for TPS23754. (Rev. C) | Nov. 28, 2011 | |
| Application note | Implementing a Buck Converter With the TPS23753A | Sep. 20, 2010 | |
| Application note | Using the TPS23753A with an External Error Amplifier | Aug. 06, 2010 | |
| User guide | TPS23754EVM-420 EVM: Evaluation Module for TPS | Apr. 17, 2009 | |
| Application note | PoE Powered Device for 24 VAC Building Power Applications | Sep. 10, 2008 | |
| Application note | Designing an EMI Compliant PoE with Isolated Flyback | May 20, 2008 | |
| Application note | Practical Guidelines EMI Compliant PoE | Mar. 27, 2008 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
TPS23754EVM-383 contains evaluation and reference circuitry for the TPS23754, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23754 is targeted at wide Vin aplications (24 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3 at Power over Ethernet (PoE (...)
Features
- Ethernet Alliance certified for receiving Class 4 power
- Efficient, general market design
- Self driven, synchronous rectified secondary
- 25-W output power from power over ethernet (POE), 30-W output power from a 48-V adapter
- Operates from either POE or external adaptors (48 V)
- 12-V output voltage
Description
TPS23754EVM-420 contains evaluation and reference circuitry for the TPS23754, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23754 is targeted at wide Vin aplications (24 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3at Power over Ethernet (PoE (...)
Features
- Efficient, general market design
- Self driven, synchronous rectified secondary
- 25-W output power from power over ethernet (PoE), 30-W output power from a 48-V adapter
- Operates from either PoE or external adaptors (24 and 48 V)
- 5-V output voltage
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
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| HTSSOP (PWP) | 20 | View options |
Ordering & quality
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- Device marking
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- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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Support & training
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