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TPS23734

ACTIVE

IEEE 802.3bt type 3 class 1-4 PoE PD with high efficiency DC-DC control

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Data sheet

TPS23734

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 10.2 Vin (max) (V) 60 PoE current limit (min) (mA) 750 PoE inrush limit (typ) (mA) 140 rDS(on) per FET (typ) (mΩ) 300 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3 PD power level 13W, 25W DC/DC control PD and DC/DC Fault response Auto Retry Features Adapter priority, Advanced startup, Automatic MPS, Error Amplifier, Inrush delay, Primary Side Adapter Priority, Primary-side regulation, Second Gate Drive, Spread Spectrum Frequency Dithering, Thermal shutdown Operating temperature range -40 to 125 Rating Catalog
Vin (min) (V) 10.2 Vin (max) (V) 60 PoE current limit (min) (mA) 750 PoE inrush limit (typ) (mA) 140 rDS(on) per FET (typ) (mΩ) 300 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3 PD power level 13W, 25W DC/DC control PD and DC/DC Fault response Auto Retry Features Adapter priority, Advanced startup, Automatic MPS, Error Amplifier, Inrush delay, Primary Side Adapter Priority, Primary-side regulation, Second Gate Drive, Spread Spectrum Frequency Dithering, Thermal shutdown Operating temperature range -40 to 125 Rating Catalog
VQFN (RMT) 45 35 mm² 7 x 5
  • Complete IEEE 802.3bt Type 3 (Class 1-4) and 802.3at PoE PD Solution
    • EA Gen 2 Logo-Ready (PoE 2 PD Controller)
    • Robust 100 V, 0.3 Ω (typ) Hotswap MOSFET
    • Supports Power Levels for up to 30-W Operation
  • Integrated PWM Controller for Flyback or Active Clamp Forward Configuration
    • Flyback Control with Primary-Side Regulation
      • Supports CCM Operation
      • ±1.5% (typ, 5-V Output) Load Regulation (0-100% load range) — with Sync FET
      • ±3% (typ, 12-V Output) Load Regulation (5-100% load range) — Diode Rectified
    • Also supports secondary-side regulation
    • Soft-Start Control with Advanced Startup and Hiccup Mode Overload Protection
    • Soft-Stop Shutdown
    • Adjustable Frequency with Synchronization
    • Programmable Frequency Dithering for EMI
  • Automatic Maintain Power Signature (MPS)
    • Auto-adjust to PSE Type and Load Current with Auto-stretch
  • Primary Adapter Priority Input
  • –40°C to 125°C Junction Temperature Range
  • Complete IEEE 802.3bt Type 3 (Class 1-4) and 802.3at PoE PD Solution
    • EA Gen 2 Logo-Ready (PoE 2 PD Controller)
    • Robust 100 V, 0.3 Ω (typ) Hotswap MOSFET
    • Supports Power Levels for up to 30-W Operation
  • Integrated PWM Controller for Flyback or Active Clamp Forward Configuration
    • Flyback Control with Primary-Side Regulation
      • Supports CCM Operation
      • ±1.5% (typ, 5-V Output) Load Regulation (0-100% load range) — with Sync FET
      • ±3% (typ, 12-V Output) Load Regulation (5-100% load range) — Diode Rectified
    • Also supports secondary-side regulation
    • Soft-Start Control with Advanced Startup and Hiccup Mode Overload Protection
    • Soft-Stop Shutdown
    • Adjustable Frequency with Synchronization
    • Programmable Frequency Dithering for EMI
  • Automatic Maintain Power Signature (MPS)
    • Auto-adjust to PSE Type and Load Current with Auto-stretch
  • Primary Adapter Priority Input
  • –40°C to 125°C Junction Temperature Range

The TPS23734 device combines a Power over Ethernet (PoE) powered device (PD) interface, and a current-mode DC-DC controller optimized for flyback and active clamp forward (ACF) switching regulator designs . In the case of flyback configuration, the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt and IEEE 802.3at standard s for applications needing up to 25.5 W or less at PD input.

Programmable spread spectrum frequency dithering (SSFD) is provided to minimize the size and cost of EMI filter. Advanced Startup with adjustable soft-start helps to use minimal bias capacitor while simplifying converter startup and hiccup design, also ensuring that IEEE 802.3bt /at startup requirements are met.

The soft-stop feature minimizes stress on switching power FETs , allowing FET BOM cost reduction.

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 continuous conduction mode (CCM), and can work with secondary side synchronous rectification, resulting in optimum efficiency, regulation accuracy and step load response over multiple outputs.

The DC-DC controller features slope compensation and blanking. Typical switching frequency is 250 kHz.

The automatic MPS enables applications with low power modes or multiple power feeds. It automatically adjusts its pulsed current amplitude and duration according to PSE Type and system conditions, to maintain power while minimizing consumption.

The TPS23734 device combines a Power over Ethernet (PoE) powered device (PD) interface, and a current-mode DC-DC controller optimized for flyback and active clamp forward (ACF) switching regulator designs . In the case of flyback configuration, the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt and IEEE 802.3at standard s for applications needing up to 25.5 W or less at PD input.

Programmable spread spectrum frequency dithering (SSFD) is provided to minimize the size and cost of EMI filter. Advanced Startup with adjustable soft-start helps to use minimal bias capacitor while simplifying converter startup and hiccup design, also ensuring that IEEE 802.3bt /at startup requirements are met.

The soft-stop feature minimizes stress on switching power FETs , allowing FET BOM cost reduction.

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 continuous conduction mode (CCM), and can work with secondary side synchronous rectification, resulting in optimum efficiency, regulation accuracy and step load response over multiple outputs.

The DC-DC controller features slope compensation and blanking. Typical switching frequency is 250 kHz.

The automatic MPS enables applications with low power modes or multiple power feeds. It automatically adjusts its pulsed current amplitude and duration according to PSE Type and system conditions, to maintain power while minimizing consumption.
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Technical documentation

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* Data sheet TPS23734 IEEE 802.3bt Type 3 Class 1-4 PoE PD with High Efficiency DC-DC Controller datasheet (Rev. A) PDF | HTML 21 Sep 2020
EVM User's guide TPS23734EVM-094 Evaluation Module (Rev. A) PDF | HTML 17 Aug 2022
More literature PoE Powered Devices Debug Guidelines PDF | HTML 19 Jul 2021
More literature PoE PD Schematic Review Guidelines PDF | HTML 29 Apr 2021
More literature Soft-Stop: TPS2373X Feature Explanation PDF | HTML 27 Oct 2020
Certificate TPS23734EVM-094 EU Declaration of Conformity (DoC) 29 May 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS23734EVM-094 — TPS23734 IEEE802.3bt type 3 Class 4 PoE PD applications evaluation module

The TPS23734 evaluation module (TPS23734EVM-094) contains evaluation and reference circuitry for the TPS23734, which is a IEEE802.3bt Type 3 Class 4 PoE PD, EA Gen 2 Ready, controller suitable for Type 3 (25.5W) PoE PD applications.
User guide: PDF | HTML
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Gerber file

TPS23734EVM-094 Gerber Files

SLUC699.ZIP (1117 KB)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

PMP23278 — Class 4 PoE PD, 12-V, 2.1-A active-clamp forward converter reference design

This reference design implements a Power over Ethernet (PoE) power device (PD) active clamp forward converter with 12-V and 2.1-A output. A TPS23734 PD, pulse width modulator (PWM) controller provides all the necessary functions to implement the PoE PD control and the PWM control for the active (...)
Test report: PDF
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VQFN (RMT) 45 View options

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