Abstract: Any step-down DC-DC converter can be used as an inverter with no changes to the operating schematic. This application note shows how to relabel the connector points to do this. Any step-down DC-DC converter can be used as an inverter with no changes to the operating schematic. The only difference between the normal step-down application and inverting operation is the labels of the connection points. The step-down DC-DC converter's VOUT node is GND in the inverter. The step-down DC-DC converter's GND node is -VOUT in the inverter. Input power, VIN, is the same node in both circuits. When using a step-down DC-DC converter as an inverter, there are some limitations. The voltage difference between the input and the negative output must be less than the step-down DC-DC converter's maximum operating input voltage. In essence, a step-down DC-DC converter with maximum input of 12V can be used to convert 5V to -7V, but not more. In addition, the minimum input voltage of the inverting circuit must be greater than the minimum operating voltage of the step-down IC, minus one diode drop. That is because on start-up, there is initially no negative output voltage. Consequently, the step-down IC is biased only by the input voltage, less a diode forward drop. Figure 1. Block diagram shows a generic step-down DC-DC converter as both a normal step-down (Figure 1a) and connected as a negative-output voltage inverter (Figure 1b). 자동 업데이트 관심 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트를 원하십니까? 그렇다면 EE-Mail™을 신청하십시오. We Want Your Feedback! 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오.   다운로드, PDF 형식 (29kB)  AN3844, AN 3844, APP3844, Appnote3844, Appnote 3844