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2016-05-17 13:44  
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 This H-Bridge design is capable of handling up to 80V at 30+ amps.Its based off of the IRF1310N and IRF5210 Mosfets. These Mosfets have built-in protection diodes.  In the above schematic the high voltage and high current components are optically isolated from the drive components. This could allow TTL level signals to drive the H-Bridge, This particular layout is based on a 48V motor. The unit could run motors from 12V up to 90V. However running 90V motors would not be recommended because the inducted voltages could surpass the 100V limits of the parts. I would recommend 48V be the highest.Different Drive voltages will require changing the R3 and R4 Resistor network values. The goal is to put as close to 10V difference at the gates. R3R448V15K3.9K24V3.3K2.2K12V2701KThese values keep the total current flow through the resistors at around .125 Watts (1/8 Watt)The above schematic is based off of 1/16 watt SMD parts.Note that R4E,F are also based on 1/16 Watt parts and will need to be changed based on the drive logic voltage.The purpose of D1,D2,D9 and D10 is to assure that there is never more than 10V difference between the Gate and Source.D3 and D4 are simple protection to prevent turning on the wrong pairs to cause punch through.C1 and C2 are to create a simple R-C time delay between turning on the one leg to also help prevent punch through. IRF5210