Other Parts Discussed in Thread: TPS24750, TEST
I am checking TVS1400 as a replacement to SMAJ12A-E3/5A. This TVS is placed after TPS24750 + CSD16570Q5BT reverse current blocking FET. TPS24750 does not allow below -0.3V at its output. The CSD16570Q5BT has ~0.6V body diode drop. Therefore at my connector pin, I want to prevent voltages lower than -0.9V. In case of a fuse tripping, the cable inductance will turn on my TVS in the forward mode. I expect worst case 3A.
I want to find out the forward voltage drop of TVS1400 @3A, the forward conduction behavior is not given in the datasheet. I simulated it on Tina TI, however I see an interesting behavior where the forward drop jumps from 1.3V to 2V at 1.5A forward current and reaches 2.2V @3A. Is the Tina Spice model of this component modelling forward conduction behavior correctly (doesn't look like a simple diode at all)? How much drop would I see @3A free-wheeling situation?