3 Watt SMD DC/DC Converter Isolation Modules 3 Watt SMD DC/DC Converter Isolation Modules The TGM-H251NF and TGM-H281NF transformers provide the isolation and voltage outputs required for low cost isolated DC/DC converter circuits. These high efficiency, extended temp range transformers have been designed specifically for the Maxim MAX256 controller and H bridge driver with 3.3V or 5V power source. Fully tested and approved by Maxim in this 3 watt application. UL60950 and EN60950 recognized. For more information, pertaining to the MAX256 please contact Maxim at (408) 737-7600. Maxim is a registered trademark of Maxim Integrated Products. NF Package Circuit Diagram Patented Construction US Pat Nbrs: 5,656,985 6,297,721 B1 6,297,720 B1 6,320,489 B1 6,344,785 B1 Electrical Specifications 25C Operating Temp: -40to +85C Pri Pins: 1-4 E T Constant (P1-4,2-3 connected): 18.5 V-ms min. Isolation Voltage 1,500 Vrms Turns Ratio 3% PRI-OCL PRI-DCR Cw/w Part Number PRI : SEC H Typ Max. pF Max TGM-H251NF 1:1:1:1 198 100m 15 TGM-H281NF 1:1:2.6:2.6 198 100m 15 HALO Electronics 1861 Landings Drive, Mountain View, CA 94043 PH: 650-903-3800 www.haloelectronics.com info haloelectronics.com This Datasheet: 3wattdc-dc Rev. 10/05