Sliding mode control with higher order strategy for buck converter in the presence of dynamic load

•Procedures for third order classical sliding surface (CSS) and Proportional Integral Derivative Sliding Surface (PIDSS) for PMDC motor.•Servo and regulatory responses are obtained using CSS and PIDSS for buck converter fed DC motor.•The control law avoids overshoot, rejects disturbance in the larger working range and is more resilient to uncertainties.