Overview
The TPS23785BEVM-522 evaluation module (EVM) is a fully assembled and tested circuit designed for evaluating the TPS23785B high-power, high-efficiency power over Ethernet (PoE) powered-device (PD) controller and DC-to-DC converter. This module is compliant with the IEEE 802.3at PoE standard and is optimized for non-isolated converter topologies. It features a dual output non-isolated flyback converter capable of outputting 5 V at 580 mA and 3.3 V at 900 mA, making it suitable for various high-efficiency PoE applications.
Key Specifications
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| Input voltage (PoE input J1) | Applied to the power pins of connector J1 | 0 | - | 57 | V |
| Input voltage (DC input J4) | Applied to the power pins of connector J4 | 34 | - | 57 | V |
| Rising input voltage | - | - | 36.1 | - | V |
| Falling input voltage | - | - | 29.14 | - | V |
| Detection voltage | At device terminals | 3 | - | 10 | V |
| Classification voltage | At device terminals | 13 | - | 21 | V |
| Classification current | Rclass = 137 Ω | 17.6 | 19.4 | - | mA |
| Inrush current-limit | - | 100 | - | 180 | mA |
| Operating current-limit | - | 850 | - | 1100 | mA |
| Output voltage (5 V) | VIN = 48 V, ILOAD ≤ ILOAD (max) | 4.98 | 4.94 | - | V |
| Output voltage (3.3 V) | VIN = 48 V, ILOAD ≤ ILOAD (max) | 3.311 | 3.310 | - | V |
| Output current (5 V) | 34 V ≤ VIN ≤ 57 V | - | - | 580 | mA |
| Output current (3.3 V) | 34 V ≤ VIN ≤ 57 V | - | - | 900 | mA |
| Switching frequency | - | - | 250 | - | kHz |
Key Features
- Compliance with IEEE 802.3at PoE standard
- Class 2 PoE applications
- Operates from PoE or auxiliary adapters
- Dual output non-isolated flyback converter (5 V at 580 mA, 3.3 V at 900 mA)
- High-efficiency power over Ethernet (PoE) PD and DC-to-DC controller
- Header connectors for easy connection to external test and application circuitry
Applications
- Video and VoIP telephones
- RFID readers
- Security – wired IP cameras
- Wireless access points
Q & A
- What is the TPS23785BEVM-522 evaluation module used for?
The TPS23785BEVM-522 is used for evaluating the TPS23785B high-power, high-efficiency power over Ethernet (PoE) PD and DC-to-DC controller.
- What are the output voltages and currents of the TPS23785BEVM-522?
The module outputs 5 V at 580 mA and 3.3 V at 900 mA.
- Is the TPS23785BEVM-522 compliant with any PoE standards?
Yes, it is compliant with the IEEE 802.3at PoE standard.
- What are the input voltage ranges for the TPS23785BEVM-522?
The input voltage ranges are 0 to 57 V for PoE input and 34 to 57 V for DC input.
- What is the switching frequency of the DC-to-DC converter?
The switching frequency is 250 kHz.
- Can the TPS23785BEVM-522 be powered from sources other than PoE?
Yes, it can be powered from auxiliary adapters or a DC source through connector J4.
- What types of devices can use the TPS23785BEVM-522?
It is suitable for video and VoIP telephones, RFID readers, wired IP cameras, and wireless access points.
- How does the module handle inrush current?
The module has an inrush current-limit feature, limiting the current to between 100 mA and 180 mA.
- What is the classification current for the TPS23785BEVM-522?
The classification current is between 17.6 mA and 19.4 mA with Rclass = 137 Ω.
- Are there any specific connectors for external connections on the TPS23785BEVM-522?
Yes, the module includes header connectors such as J1 for PoE input, J4 for auxiliary DC input, and others for output and test points.
