TPS23758 IEEE 802.3at PoE PD with no-opto sync flyback DC-DC controller | TI.com

TPS23758
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IEEE 802.3at PoE PD with no-opto sync flyback DC-DC controller

 

Recommended alternative parts

  • TPS23755  -  Use this product in a primary side regulated diode rectified flyback; for 12V or higher output voltage applications

Description

The TPS23758 device combines a Power over Ethernet (PoE) powered device (PD) interface, a 150-V switching power FET, and a current-mode DC-DC controller optimized for flyback topology. The high level of integration along with primary side regulation (PSR), spread spectrum frequency dithering (SSFD), and advanced startup makes the TPS23758 an ideal solution for size-constrained applications. The PoE implementation supports the IEEE 802.3at standard as a 13-W, Type 1 PD.

The PSR feature of the DC-DC controller uses feedback from an auxiliary winding for control of the output voltage, eliminating the need for external shunt regulator and optocoupler. It is optimized for operation in continuous conduction mode (CCM) with secondary side synchronous rectification, resulting in optimum overall efficiency, regulation accuracy and step load response over multiple outputs (for example 5-V and 3.3-V output). Typically, the converter operates at a switching frequency of 250 kHz.

SFFD and slew rate control helps to minimize the size and cost of the EMI filter. Advanced Startup allows the use of minimal bias capacitor while simplifying converter startup and hiccup design.

Primary auxiliary power detect (APD) pin can be used to provide priority for a primary side power adapter.

The DC-DC controller features adjustable soft-start, slope compensation, and blanking. For non-isolated applications, the buck topology is also supported by the TPS23758.

Features

  • Complete IEEE 802.3at PD solution for type 1 PoE
    • Ethernet Alliance (EA) logo certified designs available
    • Robust 100-V, 0.36-Ω (typ) hotswap MOSFET
  • Integrated PWM controller with 0.77-Ω (typ) 150-V power MOSFET
    • Flyback controller with PSR
      • Supports CCM operation with secondary side synchronous FET— multi-outputs
      • ±1% (typ, 5-V Output) Load regulation (0-100% load range) — with Sync FET
    • Supports low-side switch buck topology
    • Adjustable switching frequency with synchronization
    • Soft-start control with advanced startup
    • Programmable slew rate and frequency dithering for enhanced EMI reduction
  • Primary adapter priority input
  • –40°C to 125°C Junction temperature range
  • Small 6-mm x 4-mm VSON package

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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
TPS23758 Order now 10.2     57     405     140     360     802.3at Type 1 (802.3af)     13W     PD and DC/DC     Auto Retry     Advanced startup
Error Amplifier
Integrated Switching FET
Primary Side Adapter Priority
Primary-Side Regulation
Spread Spectrum Frequency Dithering
Thermal Shutdown    
VSON | 23     23VSON: 24 mm2: 4 x 6 (VSON | 23)     Programmable
Synchronizable    
TPS23753A Order now 9.3     57     405     140     700     802.3at Type 1 (802.3af)     13W     PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Thermal Shutdown    
TSSOP | 14     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     Programmable
Synchronizable    
TPS23755 Order now 10.2     57     405     140     360     802.3at Type 1 (802.3af)     13W     PD and DC/DC     Auto Retry     Advanced startup
Error Amplifier
Integrated Switching FET
Primary-Side Regulation
Secondary Side Adapter Priority
Spread Spectrum Frequency Dithering
Thermal Shutdown    
VSON | 23     23VSON: 24 mm2: 4 x 6 (VSON | 23)     Programmable
Synchronizable    
TPS23757 Order now 9.3     57     400     140     430     802.3at Type 1 (802.3af)     13W     PD and DC/DC     Auto Retry     Primary Side Adapter Priority
Second Gate Drive
Thermal Shutdown    
TSSOP | 20     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)     Programmable
Synchronizable    
TPS23770 Order now 0     67     405     140     600     802.3at Type 1 (802.3af)     13W     PD and DC/DC     Auto Retry     Error Amplifier
Thermal Shutdown    
HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     Programmable