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The eFuse circuit is connected to the 3.3V regulator (using a resistor in place of L2/L3). Initially, L3 was populated, but the eFuse output showed 0V. Even after disconnecting L3, the eFuse output remained at 0V. To resolve the issue, I modified the 3.3V regulator circuit by disconnecting power from the eFuse output using L3 DNL and connected L2 to feed U3 power from the input of the eFuse. After this change, the eFuse output started functioning correctly. The continuous load current is approx 50mA.I have tested the circuit with Rlim = 20K, but still no output voltage.
The behavior of the eFuse output is puzzling and inconsistent when L2 is connected compared to when it is disconnected, regardless of the presence of L3.
Any pointer what could be wrong?
Hi Nik,
When both L2 and L3 are absent does eFuse shows VOUT?
Regards
Kunal Goel
Hi Kunal, Any update on this case? My board testing is on hold since eFuse is not working. This is a critical issue.
Hi Nik,
For the both case when L2 is there and not there I need to look at waveforms to comment what is happening. Please capture VIN,VOUT,FLT,SHDN,.
Regards
Kunal Goel
Hi Nik,
SHDN is staying low in L2 uninstalled case. That will not cause device to power up. Is it possible this MCU signal is pulling it low?
You can remove R57 and check again.
Regards
Kunal Goel
Kunal,
I have conducted further tests on the circuit by removing R57, but unfortunately, there is still no Vout. Without Vout, the 3.3V supply is absent, causing the MCU not to power up. I am beginning to suspect that the on-chip Avdd might not be functioning as expected.
Interestingly, when I connected U3 input to eFuse Vout, the eFuse Vout did not function. However, after reconfiguring U3 input to the eFuse input, the 3.3V output started working perfectly, and it successfully pulled the SHDN pin out of reset, enabling Vout to work as intended.
CH1= Vin, CH2= Vout, CH3=SHDN, CH4=FLT
Hi Nikhil,
Closing the thread here. Lets continue our discussion over mail.
Regards
Kunal Goel