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TL431: Stability Boundary Conditions for load capacitance under VKA ＝3.3V, all temp.

Motoyasu Hattori
Genius 11095 points
Part Number: TL431

Hi,

Could you please provide stability boundary conditions for load capacitance under VKA=3.3V and all temp range?

On the datasheet, we can find the following figure on VKA=Vref or 5.0V and Ta=25C.  But my customer requests the figure under his condition (VKA=3.3V and all temp range).  Please support us.  He wants to use this to decide load capacitance.

Thanks and best regards,
M.HATTORI.

  • 0
    TI__Mastermind 19580 points

    Hi M.Hattori,

    We do not have that information available. I would use the VKA = VREF fine as it will be conservative.

    That graph on the datasheet is typical and represents 0 degree phase margin. I would choose a capacitor that is 1/2 to a full decade away from the boundary due to lot/lot variations and temperature deviations.