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TPS23730

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IEEE 802.3bt type-3 class 1-6 PoE 2 PD with high efficiency DC-DC controller

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Data sheet

TPS23730

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 10.2 Vin (max) (V) 60 PoE current limit (min) (mA) 1550 PoE inrush limit (mA) (typ) (A) 0.14 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, 51W 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 (°C) -40 to 125 Rating Catalog
Vin (min) (V) 10.2 Vin (max) (V) 60 PoE current limit (min) (mA) 1550 PoE inrush limit (mA) (typ) (A) 0.14 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, 51W 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 (°C) -40 to 125 Rating Catalog
VQFN (RMT) 45 35 mm² 7 x 5
  • Complete IEEE 802.3bt Type 3 (Class 1-6) 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 60-W operation
    • Allocated power indicator outputs - parallel or serial encoding selectable
  • 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
    • 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 1-6) 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 60-W operation
    • Allocated power indicator outputs - parallel or serial encoding selectable
  • 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
    • 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 TPS23730 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 standard for applications needing up to 51 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 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 TPS23730 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 standard for applications needing up to 51 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 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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Type Title Date
* Data sheet TPS23730 IEEE 802.3bt Type 3 PoE PD with High Efficiency DC-DC Controller datasheet (Rev. B) PDF | HTML 25 Nov 2020
EVM User's guide TPS23730EVM-093 Evaluation Module (Rev. B) PDF | HTML 02 Aug 2023
Application note PoE Powered Devices Layout Review Guide PDF | HTML 27 Aug 2021
Application note PoE Powered Devices Debug Guidelines PDF | HTML 19 Jul 2021
Application note PoE PD Schematic Review Guidelines PDF | HTML 29 Apr 2021
Technical article How to choose your Type 3 (>51-W) PoE power topology PDF | HTML 08 Dec 2020
Application note Soft-Stop: TPS2373X Feature Explanation PDF | HTML 27 Oct 2020

Design & development

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

Evaluation board

TPS23730EVM-093 — TPS23730 evaluation module for IEEE802.3bt Type 3 PoE PD applications

The TPS23730 evaluation module (TPS23730EVM-093) contains evaluation and reference circuitry for the TPS23730, which is a IEEE802.3bt Type 3 PoE PD, EA Gen 2 ready, controller suitable for Type 3 (51W) PoE PD applications.
User guide: PDF | HTML
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Gerber file

TPS23730EVM-093 Gerber Files (Rev. A)

SLVC805A.ZIP (941 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

PMP23365 — 24V, 3A Class 8 PoE PD reference design with external hot swap and telemetry

This reference design implements a Power-over-Ethernet (PoE) power device (PD) active-clamp forward converter with 24V and 3A output. A TPS23730 PD with integrated pulse-width modulator (PWM) controller provides the necessary functions for the PoE PD and PWM control for the active-clamp forward (...)
Test report: PDF
Reference designs

PMP23253 — Class 6, PoE, PD, 15-V 3.3-A active-clamp forward converter reference design

This reference design implements a Power over Ethernet (PoE) power device (PD) active-clamp forward converter with 15-V and 3.3-A output. A TPS23730 PD with integrated Pulse Width Modulator (PWM) controller provides the necessary functions to implement the PoE PD control and the PWM control for (...)
Test report: PDF
Reference designs

PMP23287 — Class 6, PoE, PD, 24-V, 2.5-A active-clamp forward converter reference design

This reference design implements a Power over Ethernet (PoE) power device (PD) active clamp forward converter with 24-V and 2.5-A outputs. A TPS23730 PD with integrated pulse width modulator (PWM) controller provides all the necessary functions to implement the PoE PD and PWM control for the (...)
Test report: PDF
Reference designs

PMP22477 — Class 6 PoE PD flyback converter (12 V, 3.8 A) with input-power limiting and PSR reference design

This reference design implements a Power over Ethernet (PoE) Power Device (PD) flyback converter with 12-V and 3.8-A output. TPS23730 PD and PWM controller provide all necessary functions to implement the PoE PD and PWM control for the flyback converter. TPS23730 uses primary side regulation (...)
Test report: PDF
Reference designs

TIDA-050045 — Type 3 IEEE802.3bt-ready active clamp forward converter PoE powered device reference design

This TI reference design showcases a Type-3, Class 6, 51-W active clamp forward converter for powered devices (PD) through PoE. The TPS23730 PD controller provides detection and classification while also containing a PWM controller. This design takes in a 37-V to 57-V PoE input, and outputs a 5-V (...)
Design guide: PDF
Schematic: PDF
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VQFN (RMT) 45 View options
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