TPS23754-1 - IEEE 802.3at PoE 接口和隔离式转换控制器

TPS23754-1是TI德州仪器公司的一款有源器件产品，TPS23754-1是IEEE 802.3at PoE 接口和隔离式转换控制器，本站介绍了TPS23754-1的封装应用图解、特点和优点、功能等，并给出了与TPS23754-1相关的TI元器件型号供参考。

TPS23754-1 - IEEE 802.3at PoE 接口和隔离式转换控制器 - 有源器件 - 以太网供电(PoE)/LAN解决方案 - 德州仪器

产品特性

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

产品应用

IEEE 802.3at Compliant Devices
Video and VoIP Telephones
RFID Readers
Multiband Access Points
Security Cameras

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS23754	HTSSOP (20)	6.50 mm × 4.40 mm
TPS23754-1
TPS23756

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