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TPS40140 question with PMP2916

Brian Wang0928
Genius 14090 points
Other Parts Discussed in Thread: TPS40140

I have an application question of PMP2916.

In the circuit of PMP2916, why the FB2 is connected to BP5(5V) if single device and 2 phase mode are implemented?

In the DS, the FB2 is connected to grounding in this mode.

Power Condition:

IC: TPS40140

12Vin

3.3Vout/50A

Do you have ref. design for above condition with NexFET MOSFETs?

FAE Brian

  • 0
    TI__Guru 56925 points

    Brian,

     

    Connecting the FB2 pin to GND or BP5 both disable the error amplifier.  Designs originally developed before the final release of the TPS40140 controller used this interchanibly when only using a single device (2-phase).

    This configuration does not provide correct phase positioning in chip solutions, but for a single chip 2-phase solution either works.

    Current Designs should follow the Datasheet recommendation of connecting FB2 to GND.

     

    I will check to see if a new reference design is available using TI NexFETs

  • 0 in reply to Peter James Miller
    TI__Mastermind 49450 points

    Hi Brian,

    We have a new reference design which was using TI NexFETs. That is 1.2V/100A application by using two TPS40140. You can delete one TPS40140 for your 50A application. The schematic is attached.

    Thanks,

    Nancy

    TPS40140EVM_4phase schematic.pdf