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Hi Dylan
TL431 power will be calculated as follow -
Pdiss=Vcathode*Icathode
Regards
Trailokya
Hi Trailokya,
Could you please introduce the principle of why using Pdiss=Vcathode*Icathode?
Regards,
Dylan
Hi Dylan
The total power dissipation will be
P = VKA*IKA + VREF*IREF
Once TL431 is in regulation region, IREF will be less than 0.5% of IKA (Refer the electrical table) and VKA >= VREF. Hence we can neglect VREF*IREF component.
So please use VKA*IKA for your all the power dissipation calculation.
Regards
Trailokya