Shown here is a comparison of different modulator schemes used in high voltage to low voltage power conversion. When the upper MOSFET turns on, nodes can be very noisy in terms of voltage and current. The turn ON noise limits the practical minimum on time possible in a peak current mode controller. In valley current mode, useful information is derived when the LFET is ON, thus staying away from noisy UFET signals. Adaptive slope compensation on a valley current mode provides stable compensation across a wide range duty cycle. The adaptive slope compensation is adjustable and Renesas has employed voltage feed forward (VFF) in its modulator. The combination of these two features provides the ISL8117/A with the benefits of both a voltage mode and current mode modulator.