Evaluates: MAX5974C MAX5974C Evaluation Kit General Description Features The MAX5974C evaluation kit (EV kit) is a fully assem- IEEE 802.3af/at-Compliant PD Interface Circuit bled and tested surface-mount circuit board featur- -39V to -57V Startup Input Voltage Range ing the MAX5974C active-clamped, spread-spectrum, Demonstrates an Isolated 25W Active-Clamped, current-mode PWM controller for Power-over-Ethernet Synchronous-Rectified Forward DC-DC Converter (PoE) powered device (PD) applications. The EV kit Demonstrates Up to 93.5% Efficiency is a compact and low-cost design used in power-over- LAN (PoLAN) applications requiring DC power from an Isolated +5V Output at 4.7A Ethernet network port for PDs such as IP phones, wire- PD Detection and Configurable Classification less access nodes, and security cameras. Signatures The EV kit features a galvanically isolated 25W, 250kHz Inrush Current Limit of 180mA (max) switching-frequency, active-clamped, synchronous-recti- 2-Event Classification or Wall Adapter Detect Output fied forward DC-DC converter using the IC. The device circuit achieves high efficiency up to 93.5% using a Internal UVLO at +38V forward DC-DC converter topology. The surface-mount Evaluates Endspan and Midspan Ethernet Systems transformer provides up to +1500V galvanic isolation for Simplified Wall Adapter Interface the output. The EV kit output voltage is configured for +5V and provides up to 4.7A load current. Proven PCB Layout The EV kit includes the MAX5969B IEEE 802.3af/at- Fully Assembled and Tested compliant network PD interface controller IC, which pro- vides PD detection signature, PD classification signature, EV Kit Efficiency vs. Output Current inrush current control, and undervoltage lockout (UVLO). at V = 42V, 48V, and 57V IN The EV kit circuit receives its power from IEEE 802.3af/ EFFICIENCY vs. OUTPUT CURRENT at-compliant power-sourcing equipment (PSE). The PSE 100 provides the required -39V to -57V DC power over an V = 42V IN 90 unshielded twisted-pair Ethernet network cable to the EV kits RJ45 MagJack . The EV kit features a 1 x 1Gb RJ45 80 MagJack and two full-bridge diodes for separating the DC V = 57V IN 70 power provided by an endspan or midspan Ethernet system. 60 V = 48V IN The EV kit circuit can also be powered by a +37V to 50 +57V wall adapter power source, applied at the PWR+ 40 and PWR- PCB pads. When a wall adapter power source is detected, it always takes precedence over the PSE 30 source, allowing the wall adapter to power the EV kit. 20 Warning: The EV kit is designed to operate with high 10 voltages. Dangerous voltages are present on this EV kit 0 and on equipment connected to it. Users who power up 0 1 2 3 4 5 this EV kit or power the sources connected to it must be OUTPUT CURRENT(A) careful to follow safety procedures appropriately to work with high-voltage electrical equipment. Ordering Information appears at end of data sheet. Under severe fault or failure conditions, this EV kit can dissipate large amounts of power, which could result in IEEE is a registered service mark of the Institute of Electrical the mechanical ejection of a component or of component and Electronics Engineers, Inc. debris at high velocity. Operate this kit with care to avoid MagJack is a registered trademark of Stewart Connector possible personal injury. Systems, Inc. 19-5262 Rev 0 11/11 EFFICIENCY (%)Evaluates: MAX5974C MAX5974C Evaluation Kit Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1F 10%, 100V X7R ceramic 2200pF 20%, 250VAC X7R C1, C6 2 capacitors (1210) C18 1 ceramic capacitor (2220) AVX 12101C105KAT9A Murata GA355QR7GF222KW 0.1F 10%, 100V X7R ceramic 6800pF 10%, 25V X7R ceramic C2 1 capacitor (0805) C19 1 capacitor (0402) TDK C2012X7R2A104K Murata GRM155R71E682K 0.056F 10%, 16V X7R 0.1F 10%, 16V ceramic C3 1 ceramic capacitor (0402) C21 1 capacitor (0402) Murata GRM155R61C563K Murata GRM155R71C104K 22F 10%, 25V X7R ceramic 1000pF 10%, 1500V X7R C4 1 capacitor (1210) C22 1 ceramic capacitor (1210) Murata GRM32ER61E226K AVX 1210SC102KATA 0.047F 10%, 50V X7R 330pF 10%, 50V X7R ceramic C5 1 ceramic capacitor (0603) C24 1 capacitor (0402) Murata GRM188R71H473K Murata GRM155R71H331K 0.015F 10%, 25V ceramic 33F 20%, 63V aluminum C25 1 capacitor (0402) electrolytic capacitor C7 1 TDK C1005X7R1E153K (8.3mm x 8.3mm) Panasonic EEE1JA330P 200V, 1A bridge rectifier diodes D1, D2 2 (Mini-DIP) 100F 20%, 6.3V X5R ceramic Diodes Inc. HD01-T C8, C9 2 capacitors (1210) TDK C3225X5R0J107M 600W, 58V TVS diode (SMB) D3 1 Diode Inc. SMBJ58A 22F 10%, 10V X7R ceramic C10 1 capacitor (1210) 100mA, 80V diodes (SOD323) D4, D5, D8, D10 4 Murata GRM32ER71A226K Diodes Inc. 1N4148WS Not installed, ceramic capacitor 22V zener diode (SOD123) C11 0 D6 1 (1210) Fairchild MMSZ5251B 100V, 2A Schottky diode (SMB) 0.1F 10%, 50V X7R ceramic D7 1 Diodes Inc. B2100-13-F C12 1 capacitor (0603) Murata GRM188R71H104K 200mA, 200V diodes (S-Mini2) D9, D11 2 Panasonic DA2J108 0.1F 10%, 100V X7S ceramic C13 1 capacitor (0603) Modular side-entry, 8-position J1 1 TDK C1608X7S2A104K jack assembly 3300H, 0.024A inductor 0.01F 10%, 10V X5R ceramic L1 1 Coilcraft LPS4018-335ML C14 1 capacitor (0402) Murata GRM155R61A103K 6.8H, 8.5A inductor L2 1 Pulse PG0702.682NL 1F 10%, 10V X5R ceramic C15 1 capacitor (0402) 3.3H, 2.6A inductor L3 1 Murata GRM155R61A105K Cooper Bussmann SD53-3R3-R C16, C20, C23, Not installed ceramic capacitors 25V, 58A n-channel MOSFETs 0 C26 (0402) N1, N2 2 (PowerPak 8 SO) Infineon BSC050NE2LS 4700pF 10%, 250V X7R C17 1 ceramic capacitor (1206) -150V, -0.42A p-channel AVX 1206PC472KAT1A N4 1 transistor (6 SC70) Vishay Si1411DH Maxim Integrated 2 www.maximintegrated.com