Other Parts Discussed in Thread: TPS61376
Posting for a customer:
I’m designing in a boost converter to one of our products and I’m curious as to how LM2733Y handles a short of its output to GND. Right now I have an inline resettable/PTC fuse (F2 in the picture below) to handle any overcurrent condition. I’m wondering if it is even needed at all.
For reference, here’s the circuit I’m working with:
This boost converter takes in 4.75 – 6.8V and outputs 24.25V. I’ve sized L2 as per the calculations in the datasheet to safely supply 130mA’s without violating the 1A switch current limit. My typical max current during normal operation is 100mA.
D5 is a low Vf diode that blocks external supplies connected in error by a user from backpowering my boost converter. In other words, user-facing output is coming out from the cathode of D5.
My questions are:
- Does LM2733Y have short-circuit protection? The datasheet says it has “cycle-by-cycle current limiting” but I’m not sure if that handles an “output-connected-to-ground” fault condition.
- If LM2733Y doesn’t have short-circuit protection or I decide to go with an inline PTC fuse anyway, is there anything I should be concerned about during that fault condition?