Simplified Block Diagram
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- IEEE 802.3af and Pre-802.3at-Compliant Power-Sourcing Equipment (PSE) Circuit
- High-Power Mode Programmable Up to 45W per Port
- Port Current Readout Through I²C Interface
- Input Voltages
- -32V to -60V Providing 4A (-48V Power Circuit, 750mA/Port)
- Ethernet Network Ports
- Four RJ-45 10/100BASE-TX Ethernet Network Input Ports
- Four RJ-45 10/100BASE-TX Ethernet Network Output Power-Over-Ethernet Ports
- Demonstrates Four Separate Independent Power Switch Controllers
- Provides PD Detection and Classification
- Configurable DC/AC Load Removal Detection and Disconnect Monitoring
- Configurable Current Sensing
- Convenient Voltage and Current Test Points
- Four Output-Port LED Status Indicators
- Optically Isolated 3-Wire I²C-Compliant PC Interface
- Reconfigurable for Stand-Alone Operation or with an External Microcontroller (Requires +3.3V 100mA Supply)
- Windows 98SE/2000/XP-Compatible Software
- Fully Assembled and Tested
- Midspan Power Injectors
- Power-Sourcing Equipment (PSE)
The MAX5952A EV kit requires a -32V to -60V power supply (-48V supply rail) capable of supplying 4A or more to the EV kit for the power device (PD) through the four 10/100BASE-TX Ethernet network ports. The EV kit demonstrates PD discovery, classification, current-limit control, and other functions of an IEEE 802.3af and pre-802.3at-compliant PSE.
The MAX5952A controls the -48V DC power to each of the four Ethernet network ports by controlling the port's power MOSFET and sensing current through the respective port's current-sense resistor. The current is fed to a 10/100BASE-TX voice-over-IP magnetic module at each Ethernet output port. The MAX5952A EV kit provides a separate, independent power channel for each of the four Ethernet output ports.
The EV kit demonstrates the full functionality of the MAX5952A for each power channel such as configurable operational modes, high-power modes (programmable for up to 45W per port), port current information through I²C interface, PD detection, PD classification, overcurrent protection, current foldback, under/overvoltage protection and AC-disconnect monitoring. All these features are configurable on the EV kit and additional test points for voltage probing and current measurements have been provided.
The EV kit software is Windows® 98SE/2000/XP compatible and provides a user-friendly interface to demonstrate the features of the MAX5952A while also providing access to each register at the bit level. The program is menu driven and offers a graphic interface with control buttons. The program also includes a macro engine to allow automated evaluation and testing of the MAX5952A at the system level. The program's macro output files can be automatically saved.