obsidian-notes/电源/电阻调压改数字调压.md
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2024-04-15 11:19:57 +08:00

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---
title: 电阻调压改数字调压
updated: 2022-05-09 01:01:19Z
created: 2022-01-08 13:18:04Z
tags:
- dcdc
---
一般可调稳压器的FB电压是恒定的通过分压电阻的阻值比调整输出电压Vo=Vfb*1+R1/R2。通过接入第三个分压电阻+二极管(单向)并施以电压可实现数字调压(**下调**
# 原理
通过加入的分支实现分流,二极管作用是限定分流方向,故压降越稳定越好、越小越好
#dcdc