Single-Event Transient Effect and Hardness Design of DSD Power Converter

Double step-down (DSD) power converter can directly convert power from the intermediate bus to low-voltage point-of-load (PoL) with high efficiency, which has great potential for space applications. In this paper, the single-event transient effect of DSD converter has been investigated comprehensively. The error amplifier is found to be the most sensitive module, which will result into significant voltage disturbance. Therefore, a differential difference amplifier (DDA) with two input pairs is proposed to mitigate the single-event effect. A transconductance amplifier is used to detect the transient voltage variation and then feedback to the error amplifier. The hardness design can suppress the output voltage variation from 147.5 mV to 19.4 mV.