Hello team,
Please recommend a solution for AC-DC buck converter according to the diagram below:
- Vin = 24 VAC
- No isolation is required
- negative AC power supply wire is connected to GND
- space constraints (no headroom for large capacitors)
What the available solution can we propose for this application?
Thank you.
Hello Slava,
If you full-wave rectify the input voltage, then the most logical solution is to use a buck regulator.
I used Webench Designer assuming 24Vac with +/- 10% input and chose High Efficiency as a target.
Webench returned 362 possible designs.
To narrow the results, I then chose 87% to 92% efficiency, and 700kHz to 1.3MHz switching frequency. I then had 3 designs.
I then chose a design using the LM60440D because it had the highest efficiency (91.9%) and a 1MHz switching frequency.
I recommend trying Webench. You can decide if you want lowest cost, smallest footprint, low or high switching frequency, etc.
Regards,
Eric
