Hi,
On few boards, LM25061 is showing low impedance b/w pin 1(Sense) and pin 2(Vin).
On failing samples with initial analysis following things are found:
- Impedance b/w pin 1 & 2 of failing samples is in range of 2 to 5ohm outside board, whereas for a passing IC it is around 100Kohms.
- Power-on inrush control is happening in failing IC, but current is shooting as high as 1.5A whereas for a passing IC it is around 0.7A.
- Continuous current limit is set to 452mA in our circuit. I have tested failing IC for around 600mA. Gate is not being pulled low. Same test is done with passing IC, gate is latched low.
Values used in ckt: Rpwr=150k, Rsense 110mohm, Ctimer= 1uf, LM25061-1 part. Vin=12V
What could be the reason for this low impedance?