Hi,
Customer is investigating an issue related to LM3668, where it appears to stop working even though the PVIN and VDD are ok (3.8V) and Enable pin is high (2.5V).
They suspect that the issue could be caused by a current limiting event as described in the following extract from the datasheet:
CURRENT LIMIT PROTECTION
The LM3668 has current limit protection to prevent excessive
stress on itself and external components during overload conditions.
The internal current limit comparator will disable the
power device at a typical switch peak current limit of 1.85A
(typ.).
However, this description is not quite clear on what exactly it is meant by “disable the power device”.
Is it a permanent state? And if it is, then how can the device be taken out of this state to start working as usual?
Also, is the current being monitored instantaneous or average? What is the response time of the disabling circuit.
Thanks