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BQ24773: ACFET/RBFET MOSFETs

Mihir Bhatt
Intellectual 290 points
Part Number: BQ24773

Can we use separate MOSFET for both ACFET & RBFET instead of common source 2-N-Channel MOSFET as used in BQ24773_EVM board? Will performance be affected by keeping separate MSOFETs for ACFET/RBFET ?

  • 0
    TI__Guru 56650 points

    To separate ACFET and RBFET gate drive, how many gate drive pins do you need to connect to source and gate?

  • 0 in reply to Wang5577
    Intellectual 290 points

    Dear Wang,

    My question is, If We don't use common source 2 N-channel MOSFET, instead of that if we use 2 N-channel MOSFET IC having separate source and gate pins and then we short both gate pins and source pins together connecting to ACDRV and CMSRC respectively, What would be the effect on performance? Can we use this type of configuration?

  • 0 in reply to Mihir Bhatt
    TI__Guru 56650 points

    Could you draw your circuit? And where is CMSRC connected to? Left or right? 

  • 0 in reply to Wang5577
    Intellectual 290 points

    For your reference: Type-1 MOSFET (2- N channel MOSFETs, source(S1 & S2) and gate(G1 & G2) pins of each MOSFET are not shorted internally)

                                   Type-2 MOSFET (2- N channel MOSFETs, source and gate pins of each MOSFET are  shorted internally)

    As highlighted in red colour two MOSFETs used as ACFET(left side) & RBFET(right side), here what if we use Type-1 MOSFET instead of using Type-2? If we uses such type of MSOFET(Type-1) and manually connect both source(S1 & S2) together and then we connect it to CMSRC, the same way we do it for gate pins (G1 & G2) and connect it to ACDRV , would it affect to performance? 

  • 0 in reply to Mihir Bhatt
    TI__Guru 56650 points

    According to your statement, both type 1 and 2 are OK if the gate, drain, source connections are same as EVM reference circuit or datasheet typical block diagram.

  • 0 in reply to Wang5577
    Intellectual 290 points

    Thanks Wang.

    Regards,

    Mihir