IEEE 802.3bt type 3 class 1-4 PoE PD with high efficiency DC-DC control
TPS23734
Product details
Parameters
Package | Pins | Size
Features
- 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
- Flyback Control with Primary-Side Regulation
- 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
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Description
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 standards 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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | TPS23734 IEEE 802.3bt Type 3 Class 1-4 PoE PD with High Efficiency DC-DC Control datasheet (Rev. A) | Sep. 21, 2020 |
Application note | Soft-Stop: TPS2373X Feature Explanation | Oct. 27, 2020 | |
User guide | TPS23734EVM-094 Evaluation Module | Jun. 02, 2020 | |
More literature | TPS23734EVM-094 EU Declaration of Conformity (DoC) | May 29, 2020 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- IEEE802.3bt Type 3 class 4 Compliant PoE PD
- Integrated PWM controller for flyback or active clamp forward congifuration
- Frequency dithering for EMI reduction
- Soft-start control with advanced startup and hiccup mode overload protection
- Soft-stop shutdown
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN (RMT) | 45 | View options |
Ordering & quality
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- MTBF/FIT estimates
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- Qualification summary
- Ongoing reliability monitoring
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