Hi,
This is my very first post, so go easy on me!
I am designing a product for use in a hazardous location environment, and that requires current limiting of the power source (in this instance a 12V SLA battery). The lowest value of resistance that I am able to use for current limiting in the event of a short-circuit is about 4.2 ohms. The issue is that I am also using a buck regulator (TPS62130) to generate a 4.7V rail at up to 2A.
What I am trying to wrap my head around is how to predict the input current and thus the input IR drop into the regulator across the 4.2 ohm resistor during different load conditions.
Conversely - is there also a method for predicting this in a boost regulator, or does it create a runaway situation with 100% duty cycle or something?
This is my very first post, so go easy on me!
I am designing a product for use in a hazardous location environment, and that requires current limiting of the power source (in this instance a 12V SLA battery). The lowest value of resistance that I am able to use for current limiting in the event of a short-circuit is about 4.2 ohms. The issue is that I am also using a buck regulator (TPS62130) to generate a 4.7V rail at up to 2A.
What I am trying to wrap my head around is how to predict the input current and thus the input IR drop into the regulator across the 4.2 ohm resistor during different load conditions.
Conversely - is there also a method for predicting this in a boost regulator, or does it create a runaway situation with 100% duty cycle or something?