Click here for production status of specific part numbers. Evaluates: MAX5995A/B/C/MAX5974D MAX5995B Evaluation Kit General Description Features The MAX5995 evaluation kit (EV kit) is a fully assembled IEEE 802.3af/at/bt-Compliant PD Interface Circuit and tested surface-mount circuit board featuring an Multi-Event Classification 0-8 Ethernet port, network powered-device (PD) interface -36V to -57V Input Range controller circuit for -57V supply rail systems. The EV kit uses the MAX5995B IEEE 802.3af/at/bt-compliant Demonstrates a 71W PD Design with Isolated Active- Clamped Forward Topology DC-DC Converter network PD interface controller in a 16-pin TQFN package with an exposed pad. The IC is used in Power-over- +12V Output at 5.5A Ethernet (PoE) applications requiring DC power from Startup Inrush Current Limit of 135mA (typ) an Ethernet network port for PDs such as VoIP phones, Current Limit During Normal Operation wireless access nodes, security cameras, lighting, and building automation. Evaluates Endspan and Midspan Ethernet Systems The EV kit receives power from IEEE 802.3af/at/bt- Type 1-4 PSE Classification Indicator compliant power-sourcing equipment (PSE). Refer to Simplified Wall Adapter Interface the MAX5952, MAX5965A/MAX5965B, and MAX5980 Demonstrates Sleep and Ultra-Sleep IC data sheets for PSE controllers. The PSE provides Power-Saving Modes the required -36V to -57V DC power over an unshielded twisted-pair Ethernet network cable to the EV kits RJ45 Proven PCB Layout magnetic jack. The EV kit features a 1 x 1 Gigabit RJ45 Fully Assembled and Tested magnetic jack and two active full-wave rectifiers (N101 and N102) for separating the DC power provided by an Ordering Information appears at end of data sheet. endspan or midspan Ethernet system. The EV kit can also be powered by a wall adapter power source. The EV kit provides PCB pads to accept the output of a wall adapter power source. When a wall adapter power source is detected, it always takes precedence over the PSE source and allows the wall adapter to power the EV kit. The EV kit demonstrates the full functionality of the IC, such as PD detection signature, PD classification signature, Multi-Event Classification (MEC), Intelligent MPS, inrush current control, input undervoltage lockout (UVLO), and DC-DC step-down converter. The step-down converter operates at a fixed 290kHz switching frequency and is configured for an isolated active-clamped forward topology with output voltage +12V DC that can deliver 5.5A of current. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. Warning: The EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriately to work with high-voltage electrical equipment. Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury. 319-100275 Rev 0 11/18Evaluates: MAX5995A/B/C/MAX5974D MAX5995B Evaluation Kit The EV kit can also accept power from a wall adapter Quick Start power source. When a wall adapter power source is Required Equipment detected between the POWER+ and POWER- pads, the MAX5995 EVKIT A ICs internal isolation switch disconnects, which allows the wall adapter to supply power to the EV kit. An IEEE 802.3af/at/bt compliant PSE and a Category 5e Ethernet network cable The EV kit demonstrates the full functionality of the IC such as PD detection signature, PD classification signa - -48V, 3A capable DC power supply ture, Multi-Event Classification (MEC), Intelligent MPS, Voltmeter inrush current control, and UVLO. Resistor R101 sets the PD detection impedance. Resistors R44 and R6 set the Procedure PD classification signatures. The EV kit is fully assembled and tested. Follow the steps below to verify board operation: The EV kits integrated DC-DC step-down converter is configured for an isolated ACTIVE-CLAMPED forward Caution: Do not turn on the power supply until all converter topology with output voltage of +12V and connections are completed. provides up to 5.5A at the output while achieving up to 1) Use one of the following methods to power the EV kit: 92.5%, 92.4% and 92% efficiencies for 42V/48V/57V a) If network connectivity is required: Connect a input, respectively. The step-down converter operates at Category 5e Ethernet network cable from the EV a fixed 290kHz switching frequency. kit input port RJ45 connector to the correspond- PD Class selection by ing PSE Ethernet LAN connection that provides Classification resistors power to the EV kit. By selecting the two external resistors connected to CLSA b) If network connectivity is not required: and CLSB pins, the power consumption requested by the Connect a -48V DC power supply between the PD can be defined. Table 1 shows the the R and CLSA -54V and GND PCB pads on the EV kit. Connect R resistor values needed to set for PD class and the CLSB the power-supply positive terminal to the GND PD power consumption defined by standards. R sets CLSA pad and the negative terminal to the -54V pad. classification current for the 1st and 2nd class Events for 2) Activate the PSE power supply or turn on the external 0~4 class PD complaint with IEEE 802.3af/at standard, DC power supply. and RCLSB set classification current for the 3rd to 5th 3) Using a voltmeter, verify that the EV kit provides +12V class event for 0~8 class PD complaint with IEEE 802.3bt across the V and RTN PCB pads. standard. OUT Table 1. PSE Type and PD Class with Detailed Description of Hardware Classification Resistor R and R (or Software) CLSA CLSB The MAX5995 EV kit features an Ethernet port POWER and network PD interface controller circuit for -57V PD CLASS R R CLSA CLSB REQUESTED BY PD supply rail systems. The EV kit contains a IEEE 802.3af/ at-compliant network PD interface controller in a 16-pin 0 12.95W 619 OPEN TQFN-EP package. The IC is used in PoL applications 1 3.84W 118 OPEN for powering PDs from an unshielded twisted-pair (UTP) 2 6.49W 66.5 OPEN Ethernet Category 5e network cable and PSE port using endspan or midspan Ethernet systems. 3 12.95W 43.2 OPEN The EV kit receives power from an IEEE 802.3af/ 4 25.5W 30.9 30.9 at-compliant PSE and a UTP cable connected to the EV 5 38.25W 30.9 619 kits RJ45 magnetic jack. The EV kit uses a 1 x 1 gigabit 6 51W 30.9 118 RJ45 magnetic jack and two active full-wave bridge power rectifiers to separate the -57V DC power sent by the PSE. 7 61W 30.9 66.5 The EV kit can accept power from an endspan or midspan 8 71W 30.9 43.2 PSE network configuration. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. Maxim Integrated 2 www.maximintegrated.com