1/At present, the most important problem is that after activating IN (input effective power supply), turning off SD (high level), and operating for many times, LDO has voltage output when IN is activated and has input all the time. Once IN has no input, even if the battery voltage exceeds 3.5v, LDO output only has about 0.7v voltage. That is, if the input IN is obtained, the corresponding voltage of LDO cannot be output.
2/Our products need to be hot pressed (110 ℃, 5 minutes), so that the equipment is more prone to the above problems;
