I have a S13V30F5 (boosting a 18650 to 5v) that Im connecting a 5v/.5a pump and a 5v/1.5a vape pen for a smoke effect. When I plug the vape pen to the voltage regulator I get a faint whine from it.
Is there anything I can do to mitigate this?
The motor is controlled through a mosfet driver (connected between it and the voltage regulator) so I can control its speed. Should the vape pen also be connected through its own mosfet?
Hello.
Just to clarify, do you hear the whine with just the regulator and vape pen? If so, does adding the motor and driver change the noise?
- Patrick
Hey Patrick
Its harder to tell if the sound is there with the motor running but it does sound like its still there.
I am seeing that the regulator drops to around 2v when the pen is added, so that could be part of the problem? If I power it direct from a lipo cell it only drops it to 3.8v
The voltage dropping like that suggests that the load from the vape pen is higher than what the regulator can handle. Can you try to better quantify the load from the pen (monitor it with a current probe or current sensor)?
If the pen is drawing high currents in bursts, then putting an electrolytic capacitor across the pen’s input might help. Otherwise though, you will probably need a more powerful regulator. Here are some 5V step-up regulator options that might be worth considering depending on how much more power you need:
- Patrick
Thanks Patrick.
The pen draws 1.6a continuous. I don’t see a spoken when it starts up but maybe my multimeter isn’t sensitive enough to see it.
I’ll try the U3V40F5
