SD540 Motor Controller

[pnitin]

Originally Posted by sastoller

Since you guys seem to be SD540 experts in this thread, I was wondering if you could comment on the very high output resistance of the SD540 that was measured by CTR in their tests (surely you've seen the results). The voltage drop (power lost) in the motor controller is drastically worse than the competition? Did you guys make a design choice or tradeoff that resulted in this? Or is it possible that CTR just got a bad (or damaged) SD540?

And I'll also echo Chris's question regarding a FW update to modify the 9.5V brownout feature. Could you make this voltage threshold user adjustable in the future so that users could control which motor controllers shut off first? Would it be possible to add a throttling feature to reduce output to 50% when a certain voltage threshold is reached?

http://www.ctr-electronics.com/downl...please)?<br />

All FRC the controller on market use synchronous rectification,
they are not linear converter, so what is mentioned above is incorrect.
for example, consider your cellphone charger 115V In 5V Out @ 1A current,.
According to your theory it should dissipate 110W and should melt, but it does not. It dissipate much low power since it uses switching topology.