Hi team,
Do we have AC brown out supervisor, such as IN1M101?
It seems no for us.
Thanks.
Robin
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Hi Michael,
After confirmation with customer, they need the NDFPO and FPO output signal, and delay setting function.
You could refer to the figure in competitor's datasheet as below. As for the threshold, no detailed requirement from customer.
Do we have low cost solution to achieve the function?
Thanks.
Robin
Hi Michael,
Really appreciate your very detailed explanation.
Still some details need to confirm with you.
(1)For NDPFO generating, only TPS3850H01 could be used, because for this part, only undervoltage is monitoring, instead of functioning as a window comparator.
If window comparator is used, we must make sure the VIT+(OV)>peak value of AC voltage after divider, otherwise the nRESET will turn low when this happens, which is not same with IN1M101.
If so, the VHYST of undervoltage is about 0.5% (0.2~0.8%), which is fixed for the device. We could not set the rising edge and falling edge for the monitored voltage.
(2) The watch dog is in window mode. Only 1:8, 3:4, 1:2 could be selected.
For AC input, the normal NDPFO should be 20ms intervals for 50Hz as an example. To avoid early fault, tWDL(max) must less than 20ms(even smaller). If long delay time for FPO is needed, we should choose 1:8 ratio, then the longest time we could achieve is about 20ms*8. It is relatively limited.
Please feel free to correct me if my understanding is wrong.
Again, great thanks for your fantastic suggestion using our existing sockets.
Robin
Hi Michael,
I agree with you that 2 chips will be more robust because watchdog is disabled when nRESET is asserted.
But for two chips, the price may be not that competitive with competitor's. But I will have a try.
Great thanks for your very strong support.
Robin