Part Number:LM5069
Hello, we're using an LM5069 in a design as an electronic fuse. We've validated our design with the -1 variant of the part, using the design spreadsheet supplied by TI. After validating the design, we realized we wanted the automatic retry behavior of the -2 variant. We swapped this part in, without changing any of the related passive components. This single change has dramatically lowered the trip point of the circuit.
The circuit before was validated to a trip minimum of 6.1 amps (with the -1 variant on this board tripping at 6.3 amps). Swapping in the -2 variant, the trip point is 1.87 amps.
Find attached our circuit design and spreadsheet values.
Why is this circuit tripping at a much lower current when using the -2 variant?
