Other Parts Discussed in Thread: AM3359
I have a customer using TPS65217CRSLR, there are some problems, please help to support!
The AC pin of the TPS65217CRSLR connects to a DC5V power supply to generate all power supplies for the AM3359. When the main power is off, the TPS65217CRSLR must maintain power supply for at least 5s to ensure sufficient time for the CPU to store data.
2.The current existing problem:
1) Scheme 1: In the TPS65217CRSLR power supply (AC) input pin to add 1F capacity of the supercapacitor, the time did not increase significantly, the preliminary analysis of the reason is that after the main power failure, due to the large internal resistance of the supercapacitor, the power supply voltage drops below 4.3V, TPS65217CRSLR undervoltage protection.
2)Solution 2: After the supercapacitor is boosted to 5V by DCDC and connected to BAT and BAT_SENSE, the TPS65217CRSLR is also abnormal when the main power supply is powered on again.
3) For Solutions 1 and 2, after adding a supercapacitor and powering on the supercapacitor, the TPS65217CRSLR cannot output normally. After the power of the supercapacitor is basically exhausted, power on the TPS65217CRSLR to output normally.3. Problems that need to be resolved：