I am using LM393 to do the OVP circuit and I found a OVP circuit in google and I have some questions
1.) How to calculate the pull up resistor, the pull up resistor is based on the LM393 output sink current? if the output sink current is 10mA and the VCC is 12V so the pull up resistor is 12/10mA?
2.)in this circuit, is this a hysteresis schmitt circuit?
3.) The C21 is a filter capacitor, but the C29 is also the filter capacitor? If this is also filter capacitor why it connect Pin2 to Pin3, not Pin2 to Ground?
4.) why this circuit need use D5 and how it work?
hope someone can help me understand this circuit