Hi,
I wanted to clarify how the device will operate during over current condition after reading through the datasheet.
- The block diagram on page 7 shows current limit only on the high side FET on the input side of the inductor
- Section 7.4.1 in the datasheet on page 9 describes the current limit is based on the output voltage with higher output voltages the limit increases from 400mA up to the nominal current limit
Two situations:
- If the rail was to get to 3.3V and then an over current condition occurs, I believe the output the output voltage will start to drop. The device will continue to try to regulate the output and depending on how drastic the fault the device will vary the current limit. Short to GND, 400mA, slightly too much current you may find the device output of regulation (slightly under 3.3V) but not completely off. Is that correct?
- Second condition, the device never gets to regulation at start up. Depending on the voltage the device will current limit to different amounts. Is there a curve showing the behavior from 0.0V to 1.2V when it is nominal?
Thanks!
John
