New hi-speed project

[What's_nitro?]

Switching speed would be the sum of the on-state current rise/fall times.

IE: Rise = 4uS, Fall = 3uS. Total = 7uS so 1S/7uS = 142857.blah blah blah which is about 142 kHz.

[What's_nitro?]

It should be listed under the "dynamic characteristics" table.

[What's_nitro?]

Oo nS! I like it! That would be ~29 MHz for the first one and ~48 MHz for the second.

[lutach]

Originally Posted by What's_nitro?

Oo nS! I like it!

Is that good? If so I might just ask the MFG for enough samples to make 2 HV110 and extra if some fail.

[lutach]

You guys are going to turn me into an genius , but I do have to go with what Patrick says. If he gives the OK, then I'll try and get some stock on them. The 100V one I know there's stock of it, and the Tr is 15ns and the Tf is 9.3ns and will 0.01ohm make much difference?

[BrianG]

Me too! Get it done man!

[What's_nitro?]

Billionths of a second is good. It means you could run higher-pole motors at higher speeds without cogging like the BK controllers.

[lutach]

Originally Posted by What's_nitro?

Billionths of a second is good. It means you could run higher-pole motors at higher speeds without cogging like the BK controllers.

I love learning new things. Too bad I can't make ESC and just thinking if I could, this hobby would get dangerous very quick. I hate to be the reason the government ban our R/C goodies.

[What's_nitro?]

What is the current rating on the 100V? It's hard to say if the 0.01 ohm will matter, since there is usually less current flowing in a HV system the losses would be about the same as a LV but HC system with a lower resistance FET. Although 0.01 is about 5 times higher than average Rds for a FET.

[lutach]

Originally Posted by What's_nitro?

What is the current rating on the 100V? It's hard to say if the 0.01 ohm will matter, since there is usually less current flowing in a HV system the losses would be about the same as a LV but HC system with a lower resistance FET. Although 0.01 is about 5 times higher than average Rds for a FET.

The 100V has the following specs: 100V, 34A cont., 0.023ohms, Tr is 15ns and the Tf is 9.3ns. The FDS5672 has a Rds of 0.01. SO would 0.013 make a lot of differance?

[What's_nitro?]

Compared to the 0.01ohm that 0.013ohm would be 30% higher resistance and so 30% higher losses at a set current. A 10W loss would become a 13W loss and so forth. Since you would have a bunch of them in parallel to handle motor current it wont matter too much. I take it you would get a smokin' deal on these FETs- is that why you're so interested in them a not one with a lower Rds?

[lutach]

Originally Posted by What's_nitro?

Compared to the 0.01ohm that 0.013ohm would be 30% higher resistance and so 30% higher losses at a set current. A 10W loss would become a 13W loss and so forth. Since you would have a bunch of them in parallel to handle motor current it wont matter too much. I take it you would get a smokin' deal on these FETs- is that why you're so interested in them a not one with a lower Rds?

I won't buy them from the MFG just yet because it's really low QTY. When I do buy for my clients, it's really large QTYs and my prices are incredible. I'll buy them from whoever has stock and only the 100V one is showing in stock. I will have to check a couple more distributors to see if they have them. I'm going to see if I can get samples of the 60V one ASAP, if not the 100V will have to do.

[What's_nitro?]

Well a 23s controller would be pretty awesome...with 8p per phase you could easily put 10KW through that thing!

[BrianG]

While it would be nice to have 100v capability, I wonder if it would be needed. Sure, the higher resistance won't matter much if using >50v, but most won't and companies have to manufacture for the majority, not the extreme monority.

OTOH, an ESC for portable transport (like bikes) would make good use of 100v FETs. It's all about target audience. I don't see someone placing a 27s pack in their R/C anytime soon! Just the wiring of the balancer plug(s) alone would be a nightmare! Maybe if someone came out with 10v cells...

[lutach]

Originally Posted by BrianG

While it would be nice to have 100v capability, I wonder if it would be needed. Sure, the higher resistance won't matter much if using >50v, but most won't and companies have to manufacture for the majority, not the extreme monority.

OTOH, an ESC for portable transport (like bikes) would make good use of 100v FETs. It's all about target audience. I don't see someone placing a 27s pack in their R/C anytime soon! Just the wiring of the balancer plug(s) alone would be a nightmare! Maybe if someone came out with 10v cells...

The 100V can be used for only 12S lipos. My controllers are having 75V FETs in them, but they are rated for only 14S (15S max).