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BQ76952EVM: FET_EN inquiry

Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQSTUDIO, , BQ76952

Hi Team,

My customer has been testing our BQ76952EVM board via BQStudio software, but he found that DSG MOSFET was ON and CHG MOSFET was OFF after he clicked the FET_EN button(48V was indeed applied on battery cell side), what might be the cause here?   

Regards,  

  • Hi Charles,

    By default the BQ76952 configuration allows the part to go to sleep, and the charge FET is turned off in sleep.  It can be surprising to see the DSG FET on with the CHG FET off.  But if FET_EN is set and the part sees the current below its threshold, the CHG will be turned off.   To avoid this set the configuration to keep the CHG on during sleep Settings:FET:FET Options[SLEEPCHG], or disable sleep by the 0x009A SLEEP_DISABLE() subcommand (temporary) or by the Settings:Configuration:Power Config[SLEEP] setting.