If SYNC/MODE is below V_SYNC/MODE low, reverse current in the inductor is not allowed – this feature is called diode emulation. While load is heavy, operation is the same as in FPWM operation. If load is light, switching frequency is reduced saving energy and allowing regulation to be maintained. Note that while under loads which require moderate reduction of frequency, pulses often are seen if small groups, often called burst mode operation, which can increase output ripple. Under this condition, output ripple can be reduced by increasing output capacitance.