hi everybody!
my name is Kevin.
i have a project which is using da14580 as the core for my project. i facing the problem where vdcdc didn't reach near 1.41V. i am using buck mode.
the voltage i get when i put probe in vdcdc is 1.128V. is there any slution for me?
i have read tutorial 7 and have also read an-b-018. i have follow the instruction in that document. still found nothing.
this is the instruction i followed:
1.Set the voltage of your lab power supply according to the boost/buck configuration of
your prototype ( 0.9V – 1.8V for boost mode and 2.4 – 3.3V for buck mode). Set the
current limitation to just above your expected maximal current (The DA1458x draws
5 ma在巴克模式和峰值高达20米A peak in boost mode, but remember to
add the current consumed by the rest of your implementation.
2.Monitor the voltage on VDCDC as you power up the system. You should measure about
1.41V (both in boost and Buck mode). You should have a capacitor mounted really
close to the VDCDC pin that you can put your probe on.
3.If the voltage on VDCDC isn’t close to 1.41V, then power the system off and verify that
the regulator inductor is mounted correctly and test that it has not burned open.
and
• The power source is connected to VBAT3V and VBAT_RF. The power source is
typically a coin cell or two alkaline cells in series.
• VBAT3V and VBAT_RF are connected directly.
• The 2u2H regulator inductor is placed between VDCDC and SWITCH.
• VDCDC and VDCDC_RF are connected via a 4-10mm Meander line and are
individually decoupled by a 1uF capacitor (see AN-B-018 for details on the Meander
line).
• The capacitors, C2 to C4 are placed as close to the SoC as possible. C1 is placed close
to the supply source.
• A minimum of 4 capacitors is required each 1uF.
• VBAT1V is connected to GND.
I want to clarify my question
i am working in project using da14580.
While I read your recommended tutorial 7, one of the MUST criteria is
" Monitor the voltage on VDCDC as you power up the system. You should measure about
1.41V (both in boost and Buck mode). You should have a capacitor mounted really
close to the VDCDC pin that you can put your probe on."
I can make sure I have follow all the tutorial 7 guide mainly
The power source is connected to VBAT3V and VBAT_RF. The power source is
typically a coin cell or two alkaline cells in series.
• VBAT3V and VBAT_RF are connected directly.
• The 2u2H regulator inductor is placed between VDCDC and SWITCH.
• VDCDC and VDCDC_RF are connected via a 4-10mm Meander line and are
individually decoupled by a 1uF capacitor (see AN-B-018 for details on the Meander
line).
• The capacitors, C2 to C4 are placed as close to the SoC as possible. C1 is placed close
to the supply source.
• A minimum of 4 capacitors is required each 1uF.
• VBAT1V is connected to GND.
After I follow all the instruction the voltage that I get when I put probe in vdcdc is 1.128V, is this considered close to 1.41 or what?
If it's not, what is the possible mistake that I make since I have check the design and my inductor mounted correctly on board.
Can you give me insight regarding my problem, any further assistance is really helpful for my project.
[ and maybe if I can do online consultation, or meeting one of your Offsite Assistance in person I will gladly do so, I live in Indonesia, Thank You]
Hi Kevleo94,
Assuming that the design and the PCB are ok then the only thing i can think of is either a problematic inductor or a connection problem on your inductor, apart from that i dont think that anything else could be an issue. Also please check if the inductor that you are using is within the specifications that Dialog recommends.
Thanks MT_dialog