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Original question:

AFE20408: Output switch and drain switch control

AFE20408: PAON

Ajay Chaitanya T
Prodigy 60 points
Part Number: AFE20408


Tool/software:

Should we use PAON in open drain mode only using external nmos circuit. Which mode is suggested for AFE20408 PAON pin for GaN drain control?

  • 0
    TI__Genius 11710 points

    Hi Ajay,

    Open drain mode is suggested if you'd like to combine multiple open drain signals to control a Drain Enable signal. If you only want the PAON signal for the drain control, push-pull will be sufficient. The PAON pin does not interact with the GaN gates, its only used to indicate if the AFE20408 is in an alarm state or not, so you don't have to use it if you don't want to.

    Thanks,
    Erin

  • 0
    Prodigy 60 points

    Hi Erin,

    Thank you for the reply. In my design, i want to use AFE20408 for biasing 2 GaN and 1 LDMOS (total 3 devices).

    So my question is: In push-pull mode, can PAON pin drive 3 sets of NMOS-PMOS circuit for connecting drain voltage for all the three devices? or Should i use open drain mode PAON circuit for driving all three?

  • 0 in reply to Ajay Chaitanya T
    TI__Genius 11710 points

    Hi Ajay,

    It will depend on the NMOS you use in the circuit. If they require some amount of gate current, you may want to use the open-drain mode or a buffer so that the current can come from somewhere other than the PAON pin. I have not tried controlling multiple NMOS myself, but in theory you should have no problem.

    Thanks,
    Erin