Dramatic voltage drop at voltage regulator output

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SUMMARY

The forum discussion centers on a voltage drop issue at the output of a 6V voltage regulator when connected to a servo motor. Users identified that the regulator shuts down due to overheating, likely caused by the servo drawing excessive current (approximately 0.5A). Recommendations include installing a heat sink, ensuring proper capacitor connections, and verifying the health of the 12V battery. The problem persists even when testing with resistive loads, indicating a potential design flaw or component failure.

PREREQUISITES
  • Understanding of voltage regulator operation, specifically 6V and 5V voltage regulators.
  • Familiarity with servo motor specifications and current draw.
  • Knowledge of thermal management techniques, including the use of heat sinks.
  • Ability to read and interpret datasheets for electronic components.
NEXT STEPS
  • Investigate the installation of ceramic capacitors as recommended in the voltage regulator datasheets.
  • Learn about thermal management strategies for voltage regulators to prevent overheating.
  • Test the health of the 12V battery under load conditions to ensure it meets voltage requirements.
  • Explore alternative voltage regulator options that can handle higher current loads without overheating.
USEFUL FOR

Electronics engineers, hobbyists working on robotics projects, and anyone troubleshooting voltage regulation issues in power supply circuits.

  • #31
jim380 said:
okay. I think I found the problem. When the regulator is loaded with a 12 ohms resistor, the battery voltage drops from 12V to 3.4V . I've tried a couple new batteries, still the same problem.
Well done.
What type of 12 volt battery are you using, make, model, chemical technology and capacity?
 
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  • #33
Data shows discharge Rate = 480µA
It is doing very well to produce 150 mA.
 
  • #34
Baluncore said:
Data shows discharge Rate = 480µA
It is doing very well to produce 150 mA.

Yes. I figured. I also tried powering the 6v regulator using a power generator in my lab. Everything works fine when loaded with the same resistor. I'm literally running out of ideas.
 
  • #35
If you have a lab supply that works, how come you are running out of ideas?
You need to get either an 8V to 12V power supply rated at 1 amp output that runs from the AC mains,
or a 12V gel cell with sufficient capacity to produce 1 amp.
 

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