Other Parts Discussed in Thread: LMG5200,
I've been looking around for a synchronous boost control IC that might be suitable for driving the LMG5200, and it seems like the TPS43061 might be a good fit. My overall specifications for the boost converter are:
5-9V input (2x LiIon cells)
15V output @ 3A
Issues I've run into with other controllers:
- UVLO voltage too high on common PWM control ICs (UCx84x) - Not a problem with TPS43061
- Control algorithms which use the SW pin on the controller - Since the LMG5200 has ground-referenced inputs on both LO and HI, the controller SW pin would need to be tied to ground. The TPS43061 does mention adaptive dead-time control in the datasheet. Is it okay to ground the SW pin?
- DCM detection - This looks like it will work well, since the current sensing is not switch current, but inductor current.
- Gate Drive voltage - The LMG5200 has a higher AbsMax input voltage than some other GaN half-bridge modules I have considered, so the 5.5V output of the TPS43061 shouldn't be a problem.
Are there any other concerns with using the TPS43061? I am working on a schematic now, and should be able to share it tomorrow.
Thanks in advance!
Paul