|Package | PIN:||PWP | 20|
|Temp:||Q (-40 to 125)|
- 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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Texas Instruments TPS23754PWPR
The TPS23754 and TPS23756 devices have a combined power-over-ethernet(PoE), powered-device (PD) interface, and current-mode DC-DC controller optimized specifically forisolated converters. The PoE interface supports the IEEE 802.3at standard.
The TPS23754 and TPS23756 support a number of input voltage ORingoptions including highest voltage, external adapter preference, and PoE preference. These featuresallow the designer to determine which power source will carry the load under all conditions.
The PoE interface features the new extended hardware classification necessary forcompatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. Thedetection signature pin can also be used to force power from the PoE source off. Classification canbe 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 forhighly-efficient flyback topologies. The second gate driver may be disabled if desired for singleMOSFET topologies. The controller also features internal soft start, bootstrap start-up source,current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizableoscillator allows design optimization for efficiency and eases use of the controller to upgradeexisting power supply designs. Accurate programmable blanking, with a default period, simplifiesthe usual current-sense filter design trade-offs.
The TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-Vconverter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pinspacing.