In order to achieve the correct switching profile for the application it is essential to sink and source enough current to the gate. To calculate the currents the designer needs to know the required rise and fall times and the gate charge required for full saturation. The designer can then use the formula “ I = Q / t “ to calculate the required sink and source capability of the driver. It is a good idea to use a gate driver with higher drive capability and use a series network to obtain the correct currents. This also offers the opportunity to fine tune the circuit during evaluation.