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Original question:

BQ24770: ACFET, RBFET, BATFET and RAC are not in use

BQ24770: FPWM mode setting

Sam Ting
Expert 3600 points
Part Number: BQ24770

Hi Team,

We found the LSFET is always off and hot at high current condition when ACP/ACN pins are shorted together.

Can we disable the Light_Load comparator by SW? or any other workarounds? Thanks! 

Best regards,

Sam Ting

  • 0
    TI__Expert 5330 points
    Hi Sam,

    The only software control of the light-load PFM mode is the Out-of Audio Bit (register 0x12, bit [10]). Setting this won't take you out of PFM mode, but it will force the PFM to a minimum frequency of 40 kHz (to reduce switching noise in audio range.) I don't know if that will help or not as this isn't a configuration that we test, but you could try it. Even if doing this appears to help, there may still be unforseen consequences of removing R_AC, and I would still recommend that you add R_AC into your power path and connect ACN/ACP.

    Regards,
    Steve