Datasheet 8.3.3 Vccout PIn says,
When a bus fault happens and requires the maximum of 100 mA from the regulator the device will not be able to source 70 mA to external components.
My understanding is that when a bus fault happens and if the required current is less than 100mA, Vccout will still be available, am I correct?
Customer hopes the Vccout will be always available even if fault happens. Thanks.
Liu,
The particular fault that is being referred to here is the CAN bus short-circuit during a dominant pulse.
The bus is biased by VCC internally, and so in the case of this fault, the 100 mA will come from the VCC LDO integrated into the device. In this specific case, the LDO will no longer be able to supply 70 mA to peripherals. If this dominant is caused by the TCAN4550, there is a TXD dominant timeout feature that releases if the TCAN4550 holds the CAN bus dominant for too long. This time is typically ~2ms.
In other bus fault cases that do not consume 100 mA of current, the VCCOUT will still be available to supply the peripherals.
Please let me know if you have any other questions or concerns.
Regards,
