Other Parts Discussed in Thread: TIDA-00173,
Tool/software:
Reference document : TIDA-00173
This circuit can handle an input voltage up to 1200 V. (HV+ point at below circuit)
In that case, the current flowing through the series input stage is 99 µA at 1200 V input. At lower input voltages, a smaller current will flow.
Additionally, the Zener diode will clamp the voltage to ensure there is always 7.5 V between D32 and ground. I have studied the LMS33460 and confirmed that it detects overvoltage when the input voltage exceeds the threshold.
However, I predict that due to the Zener diode, the voltage will remain constant at 7.5 V.
-
If the input voltage increases to 1300 V, will the voltage between D32 and ground also rise?
-
If the answer to question 1 is yes, then if the six series resistors of 2M are changed to 1.8M, a larger current will flow at 1200 V. In that case, will overvoltage be detected at a lower voltage?
- Last, Please also explain in detail the criteria for selecting the value of the pull-up resistor.
