My customer has the following questions:
I’m intrigued by the “Flybuck” topology. I have a couple questions regarding it.
- It appears the GND/references are isolated between the primary and secondary sides. Is it required for them to remain isolated, or can they be tied together? I was planning to turn the solenoid on and off with a simple N-ch MOSFET. If I can tie the grounds together, I can probably still do that, but if they need to remain isolated, I suppose I would need some type of optocoupler/isolator.
- The voltage across the solenoid can be +/-10%, so if we tweek the output voltage slightly, would that allow an off the shelf part?
- Here’s one idea, what if the GND/reference of the secondary side was connected to the VOUT+ of the primary side, and I used a 1:1 coupled inductor, so that both outputs are approximately 12V? Then would I have approximately 24V on the series combination?
3. Is the output of the primary side (voltage on Cout) usable for other circuitry? The sheet you sent doesn’t say what the voltage is on the primary side, but if it is less than VIN, maybe this would be a good point to connect my MCU 3.3V LDO input (maybe reduce a little power dissipation in the LDO)? My 3.3V rail will pull 8mA max (with long durations of sleep).
Thanks!
