yabo国际娱乐对话半导体客户支持-振铃 https://support.dialog-semiconductor.com/resource-keywords/ringing 开关式稳压器响 https://support.dialog-semiconductor.com/switching-regulator-ringing < div class = "字段field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above”> < div class = "字段标签" >论坛:,< / div > < div class = "字段条目" > < div class =”field-item甚至“rel = " sioc: has_container " > < a href = " /论坛/ dialog-smartbond-bluetooth-low-energy - % E2 % 80% 93 -硬件-设备-引用-设计”“= " sioc:容器sioc:Forum" property="rdfs:label skos:prefLabel" datatype="">Dialog Smartbond Bluetooth Low Energy - Hardware (device &

我用DA14580和DA14581设计并路由了一个board。我不能让任何一块板在降压模式下工作,我认为这是由于在VBAT_RF和VBAT_3V上的振铃(最大振幅为+-1V的周期性阻尼振荡,从VCC持续~40us在~60MHz)。当连接芯片的3V电源来自台式机电源和电池等其他电源时,我就会感受到这种铃声。当电源未连接到芯片时,不存在振铃现象。

我可以让铃声停止,如果我移除连接到SWITCH引脚的外部电感,并从外部电源供应调节的1.41V,芯片然后功能正常,但电流消耗明显增加,所以这不是合理的长期解决方案。

我的第一个想法是开关电感与开关稳压器共振,所以我确定电感有一个>75MHz的谐振频率,如您的应用说明中规定的。我还验证了1.4V稳压器输出的去耦电容与您指定的相同,我试图从1.4V和3V网中增加和删除电容。这些都不能消除铃声。

我的设计和开发套件之间唯一明显的不同是,开发套件在电感和电容器之间有“7mm蜿蜒的轨迹”,然而我的设计不允许这种情况发生。 I have attempted to follow other layout guidelines, but again I have a tight space constraint for my design.

Have you experienced this issue before? Do you know how to get it to stop? I can add damping resistors between the SWITCH pin and the inductor or the inductor and the capacitors if necessary, however since the ringing is on the 3V rail instead of the 1.4V rail I don't know if this would help. Any insight would be appreciated.

Device: 
2016年6月10日星期五23:12:07 +0000 adkinsjd 3846年https://support.dialog-semiconductor.com https://support.dialog-semiconductor.com/switching-regulator-ringing#comments