zapped_bug
New Member
Hi there, I'm trying to build a nixie tube power supply using the max1771. I have a 6v supply that I will boost up to 179v to supply 72mA
I'm having some difficulties with two components in this circuit. The first is the Rsense resistor. I would like to limit the current to 80mA, but do not understand what value current sense resistor I need. From looking around on the web, it seems the formula is
I = 100mV/Rsense or 100mV/I = Rsense
But, it looks like the I value is the current drawn at 6V vs the output 172 volts? That doesn't seem right!![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I would be grateful if someone could explain this!
I'm having some difficulties with two components in this circuit. The first is the Rsense resistor. I would like to limit the current to 80mA, but do not understand what value current sense resistor I need. From looking around on the web, it seems the formula is
I = 100mV/Rsense or 100mV/I = Rsense
But, it looks like the I value is the current drawn at 6V vs the output 172 volts? That doesn't seem right!
I would be grateful if someone could explain this!