TPS23754-1 Datasheet | Texas Instruments

Features - Powers up to 30-W (Input) PDs - DC-DC Control Optimized for Isolated Converters - Supports High-Efficiency Topologies - plete Po E 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 Power PAD™ HTSSOP-20 2 Applications - IEEE 802.3at pliant Devices - Video and Vo IP Telephones - RFID Readers - Multiband Access Points - Security Cameras 3 Description The TPS23754 and TPS23756 devices have a bined power-over-ethernet (Po E), powereddevice (PD) interface, and current-mode DC-DC controller optimized specifically for isolated converters. The Po E 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 Po E preference. These features allow the designer to determine which power source will carry the load under all conditions. The Po E interface features the new extended hardware classification necessary for patibility 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 Po E source off. Classification can be programmed to any of the defined types with a single resistor. The DC-DC controller features two plementary 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 pensation, 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...