Low Cost High-Voltage Power Device IC Design Test And Application

Challenges have been raised in low cost high voltage power device IC design with the rapid development of power management consumer electronics product market. This thesis discusses the issues in low cost HV power device circuit design by designing a HV Buck DC-DC converter IC with 1.2um BCD process. The thesis introduces the principle of Buck DC-DC converter as well as the advantages in designing these ICs with BCD process. Analysis and discussion has been made in aspects that focused on circuit design, testing, verification, application and reliability test. The Buck DC-DC converter designed in this thesis is an asynchronous current mode PWM control topology, with a 1.4MHz typical frequency and 1.5A maximum loading current. The input range is 4.5V to 25V while the output range is 0.81V to 15 V. The convert efficiency can reach 91% in best case. The IC is verified with actual testing in mass production. Design requirement specifications have been achieved proven by both simulation waveforms and testing data. In the end, the thesis makes a conclusion of the design and some expectations in the future trends and challenges of this kind of IC.