SBFS042 June 2020 AFE3010
As shown in Figure 8, the AFE3010 uses a unique 2-stage filter architecture to provide robust protection against false trips. A series of internal comparators register the fault current thresholds at the output of the sensing amplifier. Once a valid fault threshold is detected, the filter searches for a pre-determined pattern of fault occurrences in the consecutive cycles. If the specific pattern is detected, the filter will enable the SCR driver to open the power line switch. As shown in Table 1, the AFE3010 response time is faster than the UL943 mandated requirements.
|FAULT CURRENT||FAULT RESPONSE TIME|
|mA||UL943 TIMING REQUIREMENTS (S)||AFE3010 TYPICAL RESPONSE TIME (S)|
|> ±5||< 6.335||0.150|
|> ±30||< 0.371||0.040|
|> ±50||< 0.100||0.010|