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# THS4521: The power consumption of the voltage divider resistor is too large

Part Number: THS4521
Other Parts Discussed in Thread: TIDA-00499

Now I am troubled by a problem.When my input voltage is particularly large about 3500V,I want to divide the voltage to 0.5V.ths4521-V1P_IN-（-3500V到300V).TSC

but because R2 resistance is relatively small, only 52.3 ohms，So the R1 resistance is relatively small.This will cause the R1 to withstand a lot of power consumption.about 33W. If I choose the maximum power consumption of the resistor is 2W。I need to divide R1 into equal 18 resistors, about 20k.  I think this design can't work. i think I need to increase the value of the R2 resistor ，Thereby making the resistance of R1 larger。Kai, is this the right idea? What is your point of view? What changes need to be made if the value of R2 is increased? In fact ，i want to use 1206 footprint resistor to realize the divider of the large input voltage just like the design in the TIDA-00499。

I re-simulated the design inside TIDA-00499. As shown in the attached file below. It has been found that such a design can solve the problem of large power consumption of the resistor. i can use 1812 or 2010 footprint resistor，But I don't understand what the mechanism of this design is? Is this design ok?

ths4521_Vlp_in-_-3500V to 300V.TSC

besides，once i add a 15pf  D5V0L1B2WS  as pic below，the output scope is not right，but i want to add some protection to the circuit。can  you tell why ？and  how to improve it ？please answer me timely?i have being study this for  a long time! ok!