The NTE7109 is a primary switching regulator controller in a 16Lead DIP type package designed to get the regulated DC voltage from an AC power supply. This device can directly drive a MOSFET with fast rise and fall output pulses. The NTE7109 contains not only a high frequency OSC and fast output drive, but also a current limiter with fast response and high sensibility so a true "fast switching regulator" can be realized. By adding additional compenents to the primary side, a timertype protection circuit can be made for protection against shortcircuit and overcurrent. Features: