Overview
The PM8803TR, produced by STMicroelectronics, is a high-efficiency integrated Power over Ethernet (PoE) interface and current mode PWM controller. This component is designed to simplify the power supply sections of powered devices, ensuring compliance with IEEE 802.3at standards. It can operate with power supplied either from the Ethernet cable or from an external auxiliary source, such as a wall adapter, prioritizing the auxiliary source over PoE. The PM8803TR integrates all necessary functions for PoE/PoE+ interfaces, including detection, classification, undervoltage lockout (UVLO), and inrush current limitation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTSSOP20 | - |
| Packing | Tube and reel | - |
| VDD, DET, ARTN to VSS | -0.3 to 100 | V |
| CLS, SP, DCCL to VSS | -0.3 to 3.6 | V |
| Operating junction temperature | -40 to 150 | °C |
| Storage temperature | -40 to 150 | °C |
| Hot-swap MOSFET RDS(on) | 0.45 Ω | - |
| Default inrush current limit | 125 to 155 mA | - |
| Default DC current limit | 590 to 690 mA | - |
| Oscillator frequency range | 100 to 1000 kHz | - |
| Maximum duty cycle | 75 to 85% | - |
Key Features
- IEEE 802.3at compliant PD interface
- Works with power supplied from Ethernet LAN cables or from local auxiliary sources
- Integrated 100 V, 0.45 Ω, 1 A hot-swap MOSFET
- Accurate 140 mA typical inrush current level
- Programmable classification current and DC current limit up to 1 A
- Integrated high voltage start-up bias regulator and thermal shutdown protection
- Current mode pulse width modulator with programmable oscillator frequency and internal slope compensation
- Support for flyback, forward, forward active clamp, and flyback with synchronous rectification converters
Applications
- VoIP phones
- WLAN Access Points (AP)
- WiMAX Customer Premises Equipment (CPEs)
- Security cameras
- PoE/PoE+ powered device appliances
Q & A
- What is the PM8803TR and what does it do?
The PM8803TR is an integrated Power over Ethernet (PoE) interface and current mode PWM controller designed to simplify the power supply sections of powered devices, ensuring compliance with IEEE 802.3at standards.
- What are the power sources that the PM8803TR can work with?
The PM8803TR can work with power supplied either from the Ethernet cable or from an external auxiliary source, such as a wall adapter, prioritizing the auxiliary source over PoE.
- What are the key features of the PM8803TR?
Key features include IEEE 802.3at compliance, integrated hot-swap MOSFET, programmable classification and DC current limits, high voltage start-up bias regulator, and thermal shutdown protection.
- What types of converters does the PM8803TR support?
The PM8803TR supports flyback, forward, forward active clamp, and flyback with synchronous rectification converters.
- What are the typical applications of the PM8803TR?
Typical applications include VoIP phones, WLAN Access Points, WiMAX CPEs, security cameras, and other PoE/PoE+ powered device appliances.
- How does the PM8803TR handle inrush and DC current limiting?
The PM8803TR has default inrush and DC current limits, with the ability to adjust these limits using external resistors.
- What is the significance of the T2P signal in the PM8803TR?
The T2P signal indicates successful 2-event classification when connected to a PSE performing 2-event physical layer classification.
- How does the PM8803TR manage thermal protection?
The PM8803TR includes thermal shutdown protection to prevent overheating and ensure safe operation.
- What is the maximum junction temperature for the PM8803TR?
The maximum junction temperature is 150°C, with internal overtemperature protection limiting it to 160°C.
- How is the oscillator frequency set in the PM8803TR?
The oscillator frequency is set using an external resistor connected from the FRS pin to ARTN.
