Evaluates: MAX5974A 19-5880 Rev 0 5/11 MAX5974A Evaluation Kit General Description Features The MAX5974A evaluation kit (EV kit) is a fully assembled S IEEE 802.3af/at-Compliant PD Interface Circuit and tested surface-mount circuit board featuring the S -30V to -57V Input Range MAX5974A active-clamped, spread-spectrum, current- S Demonstrates an Isolated 23.5W Coupled-Inductor mode PWM controller for Power-over-Ethernet (PoE) Forward DC-DC Converter powered device (PD) applications. The EV kit is a compact and low-cost design used in Power-over- S 92% Efficiency (MAX5974A DC-DC Circuitry) LAN (PoLAN) applications requiring DC power from S Isolated +5V Output at 4.7A an Ethernet network port for PDs such as IP phones, wireless access nodes, and security cameras. S PD Detection and Configurable Classification Signatures The EV kit features a galvanically isolated 25W, 600kHz switching frequency forward DC-DC converter using S 2-Event Classification or Wall-Adapter Detect the IC. The circuit achieves high efficiency up to 92% Output (VIN = +42V) using a coupled-inductor forward DC-DC S In-Rush Current Limit of 180mA (max) converter topology. The surface-mount transformer S Internal UVLO at +16V provides up to +1650V galvanic isolation for the output. The EV kit output voltage is configured for +5V and S Evaluates Endspan and Midspan Ethernet provides up to 4.7A load current. Systems The EV kit includes the MAX5969B IEEE 802.3af/ S Simplified Wall-Adapter Interface at-compliant network PD interface-controller IC, which S Proven PCB Layout provides PD detection signature, PD classification signature, in-rush current control, and undervoltage S Fully Assembled and Tested lockout (UVLO). The EV kit circuit receives its power from IEEE 802.3af/ Ordering Information at-compliant power-sourcing equipment (PSE). The PSE provides the required -30V to -57V DC power over an PART TYPE unshielded twisted-pair Ethernet network cable to the MAX5974AEVKIT EV Kit EV kits RJ45 MagJack . The EV kit features a 1 x 1Gb RJ45 MagJack and two full-bridge diodes for separating Denotes RoHS compliant. the DC power provided by an endspan or midspan Ethernet system. The EV kit circuit can also be powered by a +37V to +57V wall-adapter power source applied at the PWR+ and PWR- PCB pads. When a wall-adapter power source is detected, it takes precedence over the PSE source, allowing the wall adapter to power the EV kit. 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 that 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. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. MagJack is a registered trademark of Bel Fuse Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX5974A Evaluation Kit Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 10pF Q5%, 50V COG ceramic 2200pF Q10%, 250V AC X7R ceram- C1 1 capacitor (0603) C18 1 ic capacitor (2220) Murata GRM1885C1H100H Murata GA355QR7GF222KW0IL 0.1F Q10%, 100V X7R ceramic 1000pF Q10%, 1500V X7R ceramic C2 1 capacitor (1206) C22 1 capacitor (1210) KEMET C1206C104K1RACTU AVX LD10SC102KAB1A 0.056F Q10%, 16V X7R ceramic 330pF Q10%, 50V X7R ceramic C3 1 capacitor (0402) C24 1 capacitor (0402) Murata GRM155R61C104K Murata GRM155R71H331K 22F Q10%, 25V X7R ceramic 200V, 1A bridge rectifiers (MiniDIP) D1, D2 2 C4 1 capacitor (1210) Diodes Inc. HD01-T Murata GRM32ER61E226K 58V, 600W transient voltage 0.047F Q10%, 50V X7R ceramic suppressor (SMB) C5 1 capacitor (0603) D3 1 Diodes Inc. SMBJ58A Murata GRM188R71H473K (Top Mark: NG) 1F Q10%, 100V X7R ceramic D4, D5, D8, 100mA, 80V diodes (SOD323) C6 1 capacitor (1210) 4 D10 Diodes Inc. 1N4148WS AVX 1210C105KAT9A 100V, 2A Schottky diode (SMB) 33F Q20%, 63V aluminum D7 1 Diodes Inc. B2100-13-F electrolytic capacitor C7 1 D11 01 Not installed, zener diode (8.3mm x 8.3mm) Panasonic EEE1JA330P GND, 5V 2 Binding posts Modular jack assembly, side entry, 47F Q10%, 16V X5R ceramic J1 1 8 position C8C11 4 capacitors (1210) Murata GRM32ER61C476K 25V, 20A n-channel MOSFETs N1, N2 2 (PowerPak, 8 SO) 0.1F Q10%, 50V X7R ceramic Vishay SiR412DP C12 1 capacitor (0603) Murata GRM188R71H104K 150V, 4.1A n-channel MOSFET N3 1 (8 SO) 0.1F Q10%, 100V X7S ceramic Fairchild FDS86242 C13 1 capacitor (0603) TDK C1608X7S2A104K 150V, -0.42V p-channel MOSFET N4 1 (6 SC70) 0.01F Q10%, 25V X5R ceramic Vishay Si1411DH C14 1 capacitor (0402) AVX 04023D103KAT2A Q1 0 Not installed, transistor (SOT23) 0.047F Q10%, 16V X5R ceramic Q2 1 30V, 100mA pnp transistor (SOT23) C15 1 capacitor (0402) R1, R8 2 30.1kI Q1% resistors (0603) TDK C1005X7R1C473K R2 1 69.8I Q1% resistor (0603) 1500pF Q10%, 50V X7R ceramic R3 1 54.9kI Q1% resistor (0402) C16 1 capacitor (0402) R4 1 30.9I Q1% resistor (0805) Murata GRM155R71H152K R5 1 59.0kI Q1% resistor (0603) 0.01F Q10%, 250V X7R ceramic R6 1 16.9kI Q1% resistor (0402) C17 1 capacitor (1206) KEMET 12062C103KARACT4 2 Evaluates: MAX5974A