Other Parts Discussed in Thread: TPS63070, BQ25606
Dear team,
Customer met an issue of TPS63020.
System design: 5V/2A-->BQ25606-->3.5~4.2V/2A-->TPS63020-->4V/2A.
1. When EN enable, the Vin of TPS63020 will below 1.8V and make TPS63020 UVLO.
2. Adjust the capacitor, two 47uF input capacitor and two 22uF output capacitor, TPS63020 could work normal but will have small probability abnormal.
3.If add stable power supply before TPS63020, work normal.
4.Customer used to use BQ25606+TPS63070 and no similar issue happen. customer compare TPS63020 and TPS63070 and found that the transient response of TPS63020 is faster than TPS63070, so they increased the PS pin capacitor of TPS63020 from 0.1uF to 10 uF, the system could normal startup but the input voltage and output voltage is abnormal. The first picture is 0.1uF PS capacitor and the second picture is 10uF PS capacitor. The blue is input voltage and yellow is output.
Would you kindly give some suggestion on this issue? Thanks.
Best regards,
Sammi