UCC33410-Q1 pre-production samples have the following operating limits. Production
devices will have these limitations removed.
- For ambient operating temperature < 0°C, the following sequence is required to
allow the device reach regulation point during start-up. EN/FLT pin required to be high
(VEN/FLT > VEN_R ) before applying input voltage VINP to the
device. This can be achieved by connecting EN/FLT pin after the 18kΩ resistor directly
to the VINP pin and applying VINP with rise time > 6ms on the device.
- For ambient operating temperature < 0°C, the following protection features;
short-circuit, UVP and OVP protections of VCC output are disabled. Fault reporting and
auto-restart features due to these faults will be disabled as well. If the part shuts
down as a result of fault condition, the part will require to follow the same condition
in step 1 above to restart and reach regulation. This require to recycle VINP by falling
below VVINP_UVLO_F and then rising above VVINP_UVLO_R with the
same > 6ms rise time.