NMOS model selection

1. Package size , Basically, the larger the package , The more current you can withstand

2. On voltage Vgs, Try to choose a voltage smaller than the control voltage available in the actual circuit mos. For example, the control voltage can provide 3V, be mos Try to choose Vgs Less than 2V Of .

3. On resistance Rds-on. The smaller the better. , The smaller the on resistance , The smaller the partial pressure , The smaller the fever , The higher the price is. , Maybe the package will be larger .

4. Parasitic capacitance Cgs. Will affect mos The opening speed of , Because to open mos, First, charge the capacitor , Adjust the oscilloscope time scale , You can see the time required for the waveform to climb , The parasitic capacitance is too large , The square wave will be distorted .Rds The smaller it is ,Cgs The bigger it is .