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Short description: repeated failure of TPS63001
Email: seraged@ieee.org
Company: CAIRO UNIVERSITY
We are using TPS63001DRCR regulator to power a STM 32 micro controller board off a Li-ion battery.The system is used for an IoT application, where it stays off for most of the time. Thus, no load operation is very important for us to minimize power.
We test the system components one by one in isolation of other components
Thus, we test the regulator separately at no load. The PS/SYNC pi is connected to input as shown in the schematics shown below
The regulator did repeatedly fail. Large input current is observed together with no output voltage regulation or very low output is observed.
We tried to investigate the problem with TI WEBENCH. We are unable to simulate the circuit at no load case.
My question is :
1- What is the probable cause of this failure. We replaced regulator several times, Purchased the same component from different distributors, soldered the component manually and via a soldering oven using a PCB stencil board. All these trials were not successful.
2- What is the proper boot sequence for this regulator. Should we switch load on first and then switch Vin on. If we need to switch load off while VIN is high, should we switch PS/SYNC low first?