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MC34063 - Current
- Thread starter Suraj143
- Start date
rjenkinsgb
Active Member
According to the datasheet, it is rated at 1.5A
https://www.onsemi.com/pub/Collateral/MC34063A-D.PDF
You should be well within its capabilities.
If you are considering using it in a mass produced design, build a prototype first to make sure it's OK in all environmental conditions it may be exposed to; eg. if it's in a sealed enclosure with other components generating heat, you need to see how the whole system works and parts interact.
https://www.onsemi.com/pub/Collateral/MC34063A-D.PDF
You should be well within its capabilities.
If you are considering using it in a mass produced design, build a prototype first to make sure it's OK in all environmental conditions it may be exposed to; eg. if it's in a sealed enclosure with other components generating heat, you need to see how the whole system works and parts interact.
MichaelaJoy
Active Member
like rjenkinsgb said. You have to prototype it and test it under load to know for sure.
L1 is critical. Do not use a "0.6 amp" inductor.
Last edited:
From data sheet. (ST version)
Rsc 0.33 = 1A So the switch will open up at 1A and keep away from the 1.5A absolute limit.
I did not go through the math but the schematic in post #1 looks like the current will start at 400mA and turn off at 800mA in a typical cycle which will result in 600mA average. I don't see a prolbem. With the switch open the current in the diode will go from 800mA sloping back down to 400mA.
Hi thanks for the help.
I built the circuit on a vero board.I placed a small coil inductor (220uH - 4X6 size) & also placed a 220uF on the output instead of a 470uF capacitor.All other parts remains as in my first post schematic.
Results
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The coil gets really hot within the first two seconds.Really hot & comes with a bad smell.I turned it off immediately.I guess that the inductor is not enough.Going to add a high current inductor.I will tell the progress.
I built the circuit on a vero board.I placed a small coil inductor (220uH - 4X6 size) & also placed a 220uF on the output instead of a 470uF capacitor.All other parts remains as in my first post schematic.
Results
=======
The coil gets really hot within the first two seconds.Really hot & comes with a bad smell.I turned it off immediately.I guess that the inductor is not enough.Going to add a high current inductor.I will tell the progress.
Good news guys.
I replaced the inductor with a bigger one, 220uH Results good.Did a load test by loading a 600mA continuous current.The IC is getting some heat. Is it normal? Here is the schematic of my values.
Is there any method to lower down the heat in IC...!!!
I replaced the inductor with a bigger one, 220uH Results good.Did a load test by loading a 600mA continuous current.The IC is getting some heat. Is it normal? Here is the schematic of my values.
Is there any method to lower down the heat in IC...!!!
Attachments
How hot? Can you keep your finger on the IC? If so then ok.
