BQ79616: bq79616引脚CVDD的电压问题

Sinty Liang

Part Number: BQ79616

使用BQ79616设计储能系统的BMS，AFE接上16s电池模组（DC52V）后，在没有唤醒的情况下CVDD和LDOIN电压只有2.8-2.9V左右，小于数据手册中要求的关机状态下，最低电压3.4V。这是为什么？BAT电压52V应该没问题，那只有RNPN电阻和BJT三极管了，难道是选型有问题？

2 个月前

0 Eirwen 2 个月前

TI__Mastermind 35125 points

已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

0 Daniel 2 个月前

TI__Mastermind 45085 points

您好

该部件成功唤醒了吗？AVDD电压是否正确？

若设备持续无法正常运行，请将原理图发送给我进行审查。

0 Sinty Liang 2 个月前回复 Daniel

Prodigy 110 points

电压只有2.8-2.9V左右时是没有办法唤醒的。一个BMU共有4路，每路1个AFE芯片，16通道，共64通道。每路AFE的CVDD和LDOIN电压还不一样，还有的4V左右，有的5V左右，这种唤醒是没问题的。我的问题是，CVDD和LDOIN电压与什么有关？BAT电压，RNPN电阻选型，还有NPN三极管选型？原理图如下图所示：

0 Daniel 1 个月前回复 Sinty Liang

TI__Mastermind 45085 points

您好

Can you please upload a higher quality schematic? I am having difficulty reading due to the low resolution.

This is done on a custom board, correct? Are all of the boards behaving this way? Typically, if there is correct voltage on BAT, LDOIN, AVDD and CVDD is regulated correctly. Having these voltages on the device could indicate there is too much external loading on the PWR pins or a damaged IC?

What's the device in the bottom right? Where's its power coming from?