tps23754.pdf
| FEATURES | |
| Powers up to 30 W (input) PDs " | The TPS23754/6 supports a number of input voltage |
| DC/DC Control Optimized for Isolated Converters " Supports High-efficiency Topologies " | 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. |
| Complete PoE Interface " | The PoE interface features the new extended |
| Enhanced Classification per IEEE 802.3at with " | hardware classification necessary for compatibility |
| Status Flag | with high-power midspan power sourcing equipment |
| Adapter ORing Support " Programmable Frequency with Synchronization " | (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. |
| Robust 100 V | 0.5 . Hotswap MOSFET " ?0� to 125� Junction Temperature Range " |
| Industry Standard PowerPAD" TSSOP-20 " | design of active-clamp forward converters or |
| optimized gate drive for highly-efficient flyback | |
| APPLICATIONS | topologies. The second gate driver may be disabled if |
| IEEE 802.3at Compliant Devices " | desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup |
| Video and VoIP Telephones " | source, current-mode compensation, and a 78% |
| RFID Readers " Multiband Access Points " | maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to |
| Security Cameras " | upgrade existing power supply designs. Accurate |
| programmable blanking, with a default period, | |
| DESCRIPTION | simplifies the usual current-sense filter design trade- |
| The TPS23754/6 is a combined Power over Ethernet | offs. |
| (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 has a 15 V converter startup while the TPS23756 has a 9 V converter startup. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing. |
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