TPS23770 Series
Class 3 PoE PD with flyback integrated DC-DC controller & legacy UVLO threshold
Manufacturer: Texas Instruments
Catalog
Class 3 PoE PD with flyback integrated DC-DC controller & legacy UVLO threshold
Key Features
• Complete 802.3af PoE InterfaceFeatures derived from the TPS2375100 V, 0.6Internal Pass MOSFETStandard and Legacy UVLO ChoicesFixed 140 mA Inrush LimitPrimary Side DC/DC Converter ControlMinimum External Component CountCurrent Mode ControlIsolated and Non-Isolated TopologiesProgrammable Operating FrequencyCurrent Sense Leading-edge Blanking50% Duty Cycle LimitingVoltage Output Error AmplifierInternal PoE and Converter SequencingIndustry-Standard 20 Lead PackageIndustrial Temperature Range, -40°C to 85°CAPPLICATIONSAll PoE PD Devices Including:Wireless Access PointsVoIP PhonesSecurity CamerasPowerPAD is a trademark of Texas Instruments.Complete 802.3af PoE InterfaceFeatures derived from the TPS2375100 V, 0.6Internal Pass MOSFETStandard and Legacy UVLO ChoicesFixed 140 mA Inrush LimitPrimary Side DC/DC Converter ControlMinimum External Component CountCurrent Mode ControlIsolated and Non-Isolated TopologiesProgrammable Operating FrequencyCurrent Sense Leading-edge Blanking50% Duty Cycle LimitingVoltage Output Error AmplifierInternal PoE and Converter SequencingIndustry-Standard 20 Lead PackageIndustrial Temperature Range, -40°C to 85°CAPPLICATIONSAll PoE PD Devices Including:Wireless Access PointsVoIP PhonesSecurity CamerasPowerPAD is a trademark of Texas Instruments.
Description
AI
The TPS23750 integrates the functionality of the TPS2375 with a primary side dc/dc PWM controller. The designer can create a front-end solution for PoE-PD applications with minimum external components. The TPS23770 is identical to the TPS23750 with the exception of the undervoltage lockout turn-on voltage, which is compatible with legacy systems.
The PoE front end has all the necessary IEEE 802.3af functions including detection, classification, undervoltage lockout and inrush control. The PoE input switch is integrated within the TPS23750.
The dc/dc controller section is designed to support flyback, forward, and nonsynchronous low-side switch buck topologies.
The external switching MOSFET and current sense resistor provide flexibility in topology, power level, and current limit. The full-featured dc/dc controller includes programmable soft start, hiccup type fault limiting, 50% maximum duty cycle, programmable constant switching frequency, and a true voltage-output error amplifier. Additional protection features provide for robust designs.
The TPS23750 integrates the functionality of the TPS2375 with a primary side dc/dc PWM controller. The designer can create a front-end solution for PoE-PD applications with minimum external components. The TPS23770 is identical to the TPS23750 with the exception of the undervoltage lockout turn-on voltage, which is compatible with legacy systems.
The PoE front end has all the necessary IEEE 802.3af functions including detection, classification, undervoltage lockout and inrush control. The PoE input switch is integrated within the TPS23750.
The dc/dc controller section is designed to support flyback, forward, and nonsynchronous low-side switch buck topologies.
The external switching MOSFET and current sense resistor provide flexibility in topology, power level, and current limit. The full-featured dc/dc controller includes programmable soft start, hiccup type fault limiting, 50% maximum duty cycle, programmable constant switching frequency, and a true voltage-output error amplifier. Additional protection features provide for robust designs.
