12V, 5A power supply
Hello,
I need a power supply with the following features:
Input Voltage: 185V - 315V
Output Voltage: 12V
Output Current: 0.5A to 5A
-This power supply will be used to drive stepper motors and DC brushed motors.
-At a minimum it will see a continuous 0.5A load; at most, a 4.5A load for up to 12 hours a day.
-The main device can be heatsinked, but the ambient operating temperatures can be in excess of 85 degrees Celsius.
-The supply is being designed for a 25 year life.
-The input voltage will not fluctuate significantly.
I have used PIExpert to generate a preliminary design (attached) but would like to make a few changes. Can I contact someone from PI offline to discuss the details of my project?
Thanks,
Anthony
Comments
Thank you for your reply; I will try contacting an FAE before I post more detailed questions.
-Anthony
Glad I could be of help. If you have trouble getting in touch with our FAEs, let me know. If you reply back to this original thread, I'll get an email update and then you can at least talk with someone familiar with your setup (me).
From a design standpoint, your design isn't too difficult. Your electrical specification are fairly straight forward. Like I said earlier though, what it will ultimately come down to is the heat/time issue.
With proper heat sinking and/or airflow, our device should be fine. The other major components that will have a hard time with the heat are going to be the electrolytic capacitors as their electrolyte tends to boil off...either rapidly in high-heat situations or just gradually under normal operating conditions.
The capacitor issue will likely be the toughest one to deal with but luckily there are a lot of capacitor options out there.
-The Traveler
Anthony -
The basic power supply requirements don't seem too problematic. The more difficult design issues are going to be the high operating temperature and long lifetime requirement. With proper heat-sinking and airflow, neither should be a problem for our IC.
However, the components most likely to run into problems with 85degC and 25 year life expectation will be your electrolytic capacitors. You'll need to be VERY conservative in your choices on ripple current ratings for the output capacitors to minimize self-heating. Also, using long-life and high-temperature rated electrolytics will most likely be required.
If you'd like to talk directly with one of our FAEs, I'd suggest locating your closest sales/support office here: http://www.powerint.com/en/company/sales-information/worldwide-sales-support-locations
They should be able to put you in contact with the most appropriate technical/support person.
-The Traveler