The parameter ISNK is the maximum current that the BCR negotiates with the Type-C power source (Power Adapter), Therefore it is the maximum current that can be drawn from the Type-C power source. It is used to form Sink PDO as per USB PD specification. Note that the sink can draw any amount of current less than or equal to the ISNK value.
Fault LED is turned on in BCR when there mismatch in capabilities on Source and Sink. Make sure that the Power Adapter (Source) is capable of providing the voltage and current specified.
To set the ISNK value refer to Table 2-3 and Table 2-4 in BCR EVK Kit Guide and set R10, R12, R13 and R4 value respectively.
Make sure that the PDO chosen by BCR is also supported by the Power Adapter.