Hi
we would like to use TPS3806 for voltage monitor application , and design width Hysteresis range avoid power transition to cause unexpected behavior of Reset pin
but divider resistance(R1/R2/R3) seem hard to calculate suitable value.
do you have tool to share us ?? and could you suggest me to use TPS3806 for design ??
TPS3806I33 VDD: 3.3V
Monitor voltage : 24V
Monitor UV voltage : 21.6V
David
Hi David,
In the datasheet's Page 5 clearly states the resistor values calculation.
For example, if you want a 23V = V(HSENSE) and a total resistor ladder value to be 1MΩ = R1+R2+R3. Then, R3 can be easily calculated by placing these values in the equation 2.
23 = 1.207x(1M/R3) ---> R3 =55217Ω
Now that we have calculated R3, we can similarly calculate R2 from equation 1. Once we have these R2 and R3 values, we can subtract them from 1MΩ to calculate R1.
R1 = 1MΩ - R2 - R3.
Unfortunately, we don't have a tool for such calculations. Please let me know if you have any more questions.
