【经验】必易微PWM控制功率开关KP3211用于音响开关电源无输出异常分析

时间： 2022-01-05 来源：世强

技术问答

必易微电子KP321XB系列是一款高性能低成本PWM控制功率开关，适用于离线式小功率降压型应用场合，外围电路简单、器件个数少。同时产品内置650V高耐压MOSFET可提高系统浪涌耐受能力。支持降压和升降压拓扑，默认12V输出(FB脚悬空)，待机功耗<50mW。

某客户在音响开关电源上选用了KP3211，客户设计的输出电压为15V，输出电流在500mA以下。将电路通电后，发现没有输出电压，客户反馈给世强分析原因。如下为原理图：

分析如下：

1、与客户沟通先检查电路元件的选用是否正确，如检查有极性电容和二极管的极性是否焊反，确认元件的选值（感量、阻值、容值等）是否符合设计要求；检查是否有漏焊、虚焊、短路现象，检查元件外观是否有烧毁变色的痕迹。客户检查确认后回复没有问题。

2、与客户沟通更换新的芯片、电感后，问题依旧，还是没有输出。

3、仔细检查电路图，注意到输出端有并了一个18K的电阻作为假负载。怀疑可能假负载太大，电路还未建立稳定工作，建议客户在输出端再并一个3K的电阻，由此总假负载值在3K以下，未带载时也有输出3mA左右的电流以利建立稳定工作输出。客户按此建议降低假负载值后，电路工作正常。

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