TPS23751 IEEE 802.3at PoE Interface With Flyback DC-DC Controller | TI.com

TPS23751
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IEEE 802.3at PoE Interface With Flyback DC-DC Controller

 

Description

The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE) powered device (PD) interface and a current-mode DC-DC controller optimized specifically for applications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass MOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source, current-mode control with slope compensation, blanking, and current limiting. Efficiency is enhanced at light loads by disabling synchronous rectification and entering variable frequency operation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep Mode feature. Sleep Mode disables the converter to minimize power consumption while still generating the Maintain Power Signature (MPS) required by IEEE802.3at.

Features

  • IEEE 802.3at Classification With Status Flag
  • High Efficiency Solutions Over Wide Load Range
  • Powers Up to 25.5 W PDs
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Synchronous Rectifier Disable Signal
  • PowerPAD™ TSSOP Packages
  • Complete PoE Interface Plus DC-DC Controller
  • Adapter ORing Support
  • Programmable Frequency
  • TPS23752 Supports Ultra-Low Power Sleep Modes
  • –40°C to 125°C Junction Temperature Range

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) PoE current limit (Min) (mA) PoE inrush limit (Typ) (mA) rDS(on) per FET (Typ) (mOhms) PoE standards supported PD power level DC/DC control Fault response Features Package Group Package size: mm2:W x L (PKG) Switching frequency
TPS23751 Order now 9.2     57     850     140     450     802.3at Type 1 (802.3af)
802.3at Type 2    
13W
25W    
PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Thermal Shutdown
VFO    
HTSSOP | 16     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)     Programmable    
TPS23752 Order now 9.2     57     850     140     450     802.3at Type 1 (802.3af)
802.3at Type 2    
13W
25W    
PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Sleep Mode
Thermal Shutdown
VFO    
HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     Programmable    
TPS23754 Order now 15.7     57     850     140     430     802.3at Type 1 (802.3af)
802.3at Type 2    
13W
25W    
PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Second Gate Drive
Thermal Shutdown    
HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     Programmable
Synchronizable    
TPS23754-1 Order now 15.7     57     850     140     430     802.3at Type 1 (802.3af)
802.3at Type 2    
13W
25W    
PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Second Gate Drive
Thermal Shutdown    
HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     Programmable
Synchronizable    
TPS23756 Order now 9.3     57     850     140     430     802.3at Type 1 (802.3af)
802.3at Type 2    
13W
25W    
PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Second Gate Drive
Thermal Shutdown    
HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     Programmable
Synchronizable