Just remove one S… and live will be easier
Yeah I saw @jaykup 's very interesting testing of the
newer 75100s, the thermal performance is impressive. Maybe I’m missing something but I thought tolerance of high switching frequencies was less to do with thermals and more about FETs and drivers with good rise and fall times, good trace layout, voltage tolerance of inductive spikes, basically things that are a bit more involved and hard to solve than thermals.
I get the (possibly unfounded) impression that flipsky doesn’t do a huge amount of novel design. For a long time they’ve worked from the standard 4.12 design, the allegedly stolen 75100 that they put out, the antispark that was borked and reworked by Gamer then reworked again but largely just stuck on an aluminium PCB. Maybe I’m underplaying their thermal design work or misattributing problems, but bleeding edge new innovation doesn’t seem like their thing
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This controller is totally sealed by some rosin or other coating. When we look under cover we can see only shunt resistor and silicon protecting cable 
… and metal bars on pcb for big current.
And some description that this is V2 pcb.
Totally sealed.
I hope will work strong.
i need pull up to 400A for maybe 20 second … then slow down…
Like on this video… but much faster
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I know prolems with spike, in past witx XLX2 8S powered I add extra vapacitors LOW ESC
16 X 1000uF 50V 0,017ohm in parallel
This give me additional reduction of sipke 2 times
Using CASTLE ESC on log we have special plot for
RIPPLE and we can check how looks
One interesting observation with pass on motor with stron magnets - with stronger battery (very strong) rppple is bigger 
than with weak battery.
Adding 16000uF capacitor Ibreduced ripple twice, tested with oscilloscopes and LOG from CASTLE
I will meter ripple with VESC too… work in progress
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The original TO-220 75100 was designed by a college kid. Flipsky bought one from him anonymously and reverse engineered it. The original designer posted a bunch of detail on endless-sphere. Performance wise it got hot very quickly.
The Aluminum PCB version is totally different. It’s not a simple “aluminum PCB” version of the original. Flipsky’s nomenclature is pretty terrible. I don’t know if it’s an in house design, or if MakerBase designed it, or if they commissioned it or what. It’s an impressive ESCs though. This 75300 should be a beast.
The current problem is that they put 75_300_R2 firmware (from a Trampa 75/300) on them, which is specified to use phase shunts (these units have low side shunts), is reading from 3 temp sensors even though only 1 exists which gives bad “average” temp data, and at least on the models I had, the input voltage reading was off by a volt or two. The hardware config I came up with, first on the original, then adapted for the aluminum PCB designs, addresses all those things. Now that firmware in the VESC project… but it has to be manually loaded to get it off the 75_300_R2 firmware.
Long story short, @sp3swj, if you are currently on firmware 75_300_R2, then try loading the FSESC_75_200_ALU no limit firmware from here
That should help the 75300 to perform better. It’s only been tested on the 75100 and 75200, but since all of those are shipped with 75_300_R2, and the hardware layout is the same except for the number of mosfets, then I see no reason why it wouldn’t work… and you’d be a great tester for a true Flipsky 75_300 firmware.
Does the VESC tool, with 75_300_R2 loaded, show three temperature sensors but only gives a correct reading for one of them?
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Yup, same behavior on the 75100 and 75200 with the shipped firmware
Im not talking about thermal performance, just overall quality has improved a lot since the dark days when their ESCs were frankly, junk. I reference the alu boards as its this generation of controllers that all seem to have alu boards is where you can really see a marked improvement.
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Lookls like all new have ALU PCB
and lst one is waterproof - sealed
=============
today I receive info that PHASE FILTER should me FALSE
… after 2 weeks of testing … and no any onfo on PRODUCT page about this “must have”
looks like they “starting” to be responsive … - but still wait for answer for about 5 important emails
I hope i will have all answer and support before i BURN my ESC
i need pull 400A @ 50V for short term peek few second
work in progress
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Yesterday I tested firmware " no limit" … working - more info soon when go out limits
this time some test at 4S only and 2000W load - 15V 140A
( just for info - AC clamp meter working quite good between 2500 --4000 eRPM )
Can not figure out shunts are inline or lowside as in 75100/75200. Can you open the cover and take some pictures?
Shunt type is hardcoded in the firmware and timings are different and depend on the shunt type.
waterproof sealed 4mm varnish
3 x 0.005 mohm paralel per phase… but how connected…who quess
i asked flipsky for schematic with no answer.
Phase filtr - looks like should be declared as FALSE
But no info on 75300 product page ;-(
… Current status
- ater “hang up” software during test (up to 150A phase ) and stop reacting propper for throttle , only weak shake motor i write firmware 75_300_R2 normal … then wizard FOC and VESC start working normally
I continue using with FALSE phase filter with max 8S power and not more than 4kW load
testing … testing
- suddenly VESC stop working during spin motor, stop imediatelly and warm up vesc
and no back to normal operation, can not detect motor by Wizard return fail during process
now vesc not working ;-(
motor is ok, i tested motor with XLX2 and is super ok
tbc … if I receive VESC from warranty… IF
It was a stupid idea to name the unit 75/300 and it makes no sense at all.
75/300 refers to 75V300A…16S rated.
The Flipsky ESC is rated higher in voltage (20S) and the naming should reflect that.
The only reason to use the 75/300 name is making use of existing VESC product reputation and google
ranking. What obviously happens is a confusion of FW, since the VESC 75/300 FW can be found in VESC-Tool. But please never ever use that FW for the Flipsky controllers!
They confuse their customer base in marketing! This Flipsky controller is not a 75/300 design!
The VESC 75/300 is a phase shunt design, while the Flipsky ESC is actually a low side shunt design. Loading the 75/300FW onto the Flipsky “75/300” will very likely damage your hardware permanently. I can only guess that many users will damage their HW because of a very bad naming and marketing decision.
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That’s why I’ve asked their support, why they are using 75_300_R2 when their FS75100&200 controllers has low side shunts and timing are incorrent. No answer.
I am pretty confident FS75300 has low side shunts too, but who knows if they’ve changed the design.
FS75100 & FS75200 has different current sense amps for example. Both are lowside and the gain is the same.
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They use 75_300_R2 on all of those models.
75100v2 Original ebike version
75100 Aluminum PCB
75200 Aluminum PCB
75300 Aluminum PCB
The 100 and 200 are for sure low side shunts.
I’m 99% sure the 75300 is as well. I have a working hardware config for it but need more testing.
At 20s it has to be low side shunts. 18S is the highest possible phase shunt design and that is borderline voltage wise. There is a new higher voltage shunt amp on the horizon but not yet available. That new amplifier would allow 24S phase shunts.
These Flipsky units should therefore only use specific optimised Flipsky FW and not the 75/300 VESC FW.
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INA241 I guess you are talking about is already in production and I have ordered some to play with couple a weeks ago.
You do not have to use single part CS amp, though. I did 120V bidirectional CS amp for testing purposes at my work, it’s just more BOM cost and PCB space.
Yes, the INA241 is the one. Let’s see when it is available in reasonable quantities.
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