70 or greater where the input voltage vin is greater than 120v and the switching frequency is greater than 1 mhz alternatively transistors q 1 or q 2 can be replaced with a diode 106 to achieve substantially the same result as shown with the spmss 100 2 and 100 3 of fig5 8 when the diode 106 replaces transistor q 2 in smps 100 2 the smps 100 2 relies on the reverse recovery time of diode 106 i e period where diode is reverse bias conducting that allows for a negative inductor current to slew the switching node sw but the diode 106 should be selected to have an appropriate reverse recovery time to achieve this result with smps 100 2 the controller 102 2 can use comparator 206 within measurement circuit 205 2 as gate driver circuit 202 2 does not provide a gate drive or control signal to a u201c low side transistor u201d when the diode 106 replaces transistor q 1 in smps 100 3 the smps 100 3 is configured to operate as an u201c inverted buck converter u201d and similarly using the reverse recovery time of diode 106 achieves the desired result additionally the controller 102 3 can use comparator 208 within measurement circuit 205 3 as gate driver circuit 202 3 does not provide a gate drive or control signal to a u201c high side transistor u201d the use of a diode i e diode 106 may be preferable because the configuration of the controller i e 102 2 or 102 3 would be simpler but conventional diodes may be prohibitive as it may limit the functionality of the.