Diode Dl prevents negative spikes from occurring at the MOSFET gate, the 100 ohm resistor is a parasitic suppressor, and Z1 serves as a dissipative voltage regulator for the output and also clips the drain voltage to a level below the rated power FET breakdown voltage.
Low-power converter uses the core characteristics to determine frequency. With the transformer shown, operating frequency is 250 kHz.
Self oscillating circuit with self resonating transformer.
Hoffart notes, “Bob designed some of the first 3-terminal negative voltage regulators and enjoyed designing V to F  circuits.” Paul Grohe recalls two specific Pease parts, the LM337 regulator and the LM331 V-F .
Wolfspeed's half-idge 1200-V power module, the CAS325M12HM2 achieves high efficiency and power density for high-current power electronics, such as , inverters, motor drives, and electric vehicle systems. According to the manufacturer, the .
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