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TL431: About capacitor selection

Kaji@PAN
Mastermind 7775 points
Part Number: TL431

Hi,

I am a FAE of a distributor dealing with TI products.
My customer is using a TL431 device.
The capacitor between anode and cathode in use has become EOL, but there is no substitute product, and the capacitor manufacturer has requested a capacity change.
The purpose of this capacitor seems to be oscillation prevention + voltage stabilization, but the graph on the TI data sheet was only Ta = 25°C.
I want something with a wider range of ambient temperatures. Can you provide information?
Best regards,
  • 0
    TI__Genius 11401 points

    Hi

    The phase margin plot mainly varies because of gm(output transistor) /CL. As this factor goes don , Phase margin no decreases.

    gm α I_load/vt ,

    since vt increases with temperature so phase margin will degrade at higher temperature for a given current (I_load) and CL combination. Hence stable region will shrink with temperature. 

    Regards

    Trailokya