開關電源欠壓保護電路的設計

摘要：　　本文以3842峰值電流控制芯片為例，介紹了一種開關電源欠壓保護電路的設計。該電路使用元件少、欠壓檢測精度高，欠壓故障消除后可自動恢復正常工作。 敘詞：開關電源　3842 　峰值電流控制芯片　欠壓保護電路 Abstract：　　This paper takes 3842 peak current mode chip as the instance,and introduces a kind of lackvoltage protection circuits of SMPS .This circuit is consist of a few components and is very sensitive to detect lackvoltage ,specially it is able to get right　automatically after lackvoltage disappears. Keyword：SMPS 3842 peak current mode chip lackvoltage protection circuit