mEZS84801A 48V, 12W, PoE Power Supply, IEEE 802.3af Compliant FEATURES 37V to 57V PSE Input Over-Current Protection 12V Output Voltage Over-Temperature Protection 1A Load Current Over-Voltage Protection No Optocoupler Feedback Minimal External Components ORDERING INFORMATION Do-It-Yourself Option Available Input Voltage Output Voltage Output Current Part Number Efficiency (V) (V) (A) MEZS84801A 37 - 57 12 1 Up to 85% Power Derating VIN = 48V, VOUT = 12V Natural Convection ELECTRICAL CHARACTERISTICS Input Voltage Range VIN Continuous 37V to 57V Output Voltage Set Accuracy 4% (Typ.) Output Voltage Ripple IOUT = 1A 180mV (Typ.) Line Regulation 0.5% (Typ.) Load Regulation 0.2% (Typ.) Efficiency IOUT = 1A, Include Input Bridge 84.5% Efficiency vs. Load Current Switching Frequency I = 1A 140kHz (Typ.) OUT V = 37V, 48V, and 57V, V = 12V IN OUT Minimum Output Current 10mA Operating Temperature 0 to 85C Range Start-Up Time V on to V Regulated 110ms (Typ.) IN OUT 3 Calculated MTBF MIL-HDBK-217F 4185x10 hrs NOTE: All electrical characteristics are tested under 25C ambient temperature, V = 3.3V unless otherwise noted. IN mEZS84801A Rev. 1.0 www.MonolithicPower.com 1 3/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change 2017 MPS. All Rights Reserved. mEZS84801A 48V, 12W, PoE Power Supply, IEEE 802.3af Compliant DO-IT-YOURSELF SCHEMATIC J1 CR1 VDD T1 CR2 749020010A VSS J2 VDD C1A, C1B, R4 C4 C1C, C1D D1 R5 10k 10nF VOUT 2.2FX4 T2 24.9k D3 D2 C5 DET C2A C2B C2C 0.1 F SW 22 F 22 F 220 F R7 C6 T2P 20 1nF R1 J4 PG 56.2k D4 J3 FB1 CLASS R2 R6 R8 C7 20k 41.2 1k 1000pF VSS VSS FTY VCC C3 ILIM R3 1F AUX MODE 52.3k PRODUCT PACKAGE AND DIMENSIONS Pin Designation Function J1 VIN PSE Lan Input 1 ~ 2 VIN Bridge One Input 3 ~ 4 VIN Bridge Two Input 5 ~ 12 Signal Output Lan Signal Output TOP VIEW BOTTOM VIEW 13 ~ 14 VOUT Output Voltage 15 ~ 16 GND Output Ground 17 ~ 18 VDD Input Voltage after Bridge 19 ~ 20 VSS Input Ground after Bridge NOTE: SIDE VIEW Contact factory for different sizes of the boards (Quantity >2k). For more information, Gerber files, and PCB layout, please contact mEZsupport monolithicpower.com mEZS84801A Rev. 1.0 www.MonolithicPower.com 2 3/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change 2017 MPS. All Rights Reserved. VDD RTN GND AGND FB2