Inductorless, Dual Output Off-Line Regulators

The Supertex SR036 and SR037 are inductorless, dual output off-line controllers, providing up to
1.0W of output power. Theydo not require any transformers, inductors, or high voltage
input capacitors. The input voltage, HV
IN, is designed to operate from an unfiltered full wave rectified 120V or 230V AC line. It is designed to control an external N-channel MOSFET or IGBT. When HV IN is less than 45V, the external transistor is turned-on allowing it to charge an external capacitor connected to V SOURCE
An unregulated DC voltage will develop on VSOURCE
Once HV
IN
is above 45V, the transistor is turned off. The
maximum gate voltage for the external transistor is 24V. The
unregulated voltage is approximately 18V. The SR036 also
provides a regulated 3.3V whereas the SR037 provides a
regulated 5.0V