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PTN78020W UVLO

Robert Flanders
Prodigy 10 points
Other Parts Discussed in Thread: PTN78060A

Is there any adjustment to the under voltage lockout on the PTN78020 or am I stuck with a preset?

  • 0
    TI__Mastermind 38230 points

    Robert:

     

    There is no UVLO adjustment  or control on the PTN78020 series. The only suggestion is to control the inhibit pin on-off  by delaying it with an open drain FET.

  • 0 in reply to Tom Guerin
    Prodigy 10 points

    We are using the inverting version PTN78060A.

    Can the inhibit pin be utilized?  

    What is the function of the other undocumented pin (3 or 5).  Wondering if we can externally sync to a 691kHz signal.

  • 0 in reply to Dan Murray
    TI__Mastermind 38230 points

    Dan::

    Pin 3 is the inhibit pin control on-off function  ..It can be left open or  controlled by a open Drain FET. This is a low level DC voltage.

    Pin 5 is a voltage adjustment .Rset  pin. This pin controls the output voltage.

    The unit does not have an external sync. capability. The internal frequency range is internally fixed  form 440 kHz to  660kHz with typical output frequency of 550kHz .  

     EMC  or switching/ripple noise on both input bus and output bus can be attenuated by adding PI filters to either  or both input and output buses near the module. The application note within the PTN78020WAD product specification pages 19-21 attached  can be used to reduce input and output noise.

    Tom    

    Filter application note ptn78020w[1].pdf