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TPS62050DGS : PG signal output problems at LOW TEMP using Tantalum Capacitors:

sean baik
Prodigy 20 points
Other Parts Discussed in Thread: TPS62050

TPS62050DGS (DC-DC converter)

PG signal output problems at LOW TEMP (-40)  using Tantalum Capacitors:

Question:

1) Can the PG signal be erratic when using Tantalum Capacitors ?

2) How is PG signal impacted by using Tantalum Capacitors vs. Cermaic Capacitors, especially at LOW TEMP?

3) What is the reason for Tantalum Capacitors to impact the PG signal negatively ?

Please advise 

Much appreciated

Sean

  • 0
    TI__Guru**** 191445 points

    TPS62050 is intended to be used with low ESR ceramic capacitors on the output.  The PG circuitry only monitors the fed back portion of the output voltage.  When the output is 98.5% of typical, PG output is floating.  This is a pretty tight tolerance.  If you are marginally stable or otherwise have excessive ripple on the output, you may have issues.  Low input voltage can also disable PG.  Can you post your schematics and some waveforms?  Please include PG, Vout and SW to start.  Show both a resolution that shows PG falling as well as a zoom in triggered on PG falling at a time scale that shows individual SW pulses.