Step up and step down idealized converters are exactly the same thing. The circuit is as in the image and instead of putting diodes an ideal 2 positions switch is used that is equivalent in scope. That circuit is equivalent to both a buck and a boost converter.

In a step-down transformer, the number of turns in the primary winding is more than the secondary winding. Rating of Output Voltage. The step-up transformer extends the voltages from 220v-11kv or above. The step-down transformer reduces the voltages from 440 to 220v, 220 to 110v or 110 to 24v, 20v, 10v etc. Points to Remember:
an act of helping someone get up or climb something: give someone a step up He called her over to the wall, gave her a step up and over, and they were both away within minutes. Compare give someone a leg up informal SMART Vocabulary: related words and phrases Becoming better alive bloom blossom blossom into something bounce QCPx.