A Multiple-Output 500kHz DC-DC Converter

The mechanism ordinarily employed for DC-DC converters consists of inverting the DC input to AC and then again inverting to a DC output. In order to miniaturize and reduce the weight of such devices, the conversion frequency must be raised to a high level. As reported below, we obtained a stable miniature DC-DC converter using a rectangular driving pulse of 500kHz and so constructed that the on-off period ratio of the output transformer is controlled by the frequency, which is synchronized with this rectangular pulse. Also, as component parts, we used power MOS FET, which was suitable for high speed switching and the low-loss transformer material 2500B2, along with large capacitance multilayer ceramic capacitors which are not subject to the problem of lifetime.