The need for a small, economical solution for switching power supplies and for battery chargers has increased. These applications generally require both voltage limiting
and current limiting. These must be very efficient and produce a low amount of EMI radiated noise. The MC33364 is a critical conduction control IC that can be configured in
a resonant turn–off mode to reduce the amount of EMIgenerated during turn–off of the power MOSFET. The MC33341 is a secondary side controller that contains the
band gap reference to provide a very tight tolerance voltage reference. The MC33341 also allows for current limiting thus providing an almost square loop of voltage and current
needed for lithium–ion battery charging. Combining these two devices produces a much more cost–effective solution than other approaches offer.