TL431-Q1: what's the effect on Zka?

Given Ding

Part Number: TL431-Q1

Hi Team,

I see there is |Zka| in EC table, but want to check what's the effect to application on this parameter? For example, if there is another part but has higher Zka, what does it means? Thanks.

BRs

Given

over 2 years ago

+1 Ben C over 2 years ago

TI__Mastermind 27625 points

Hi Given,

|Zka| is the dynamic impedance of a shunt regulator and it is an important spec because the higher the dynamic impedance, the more Vref shift you will see as you vary VKA voltage. This means |Zka| will offset the Vref voltage in direct proportion to the cathode current. To understand more about dynamic impedance, please see the link below:

https://www.ti.com/lit/an/slva445/slva445.pdf

Ben

0 Ben C over 2 years ago in reply to Ben C

TI__Mastermind 27625 points

Hi Given,

Do you have any more questions regarding the dynamic impedance for TL431-Q1? If not, please go ahead and close the thread by clicking on "resolved". Thanks and good luck to you!

Ben

Power management

Power management forum

TL431-Q1: what's the effect on Zka?