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Re: Achieving 98% efficiency in a boost converter, RIS-767, errata

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legg wrote...
>
>On 27 May 2017 10:21:18 -0700, Winfield Hill
><hill@rowland.harvard.edu> wrote:
>
>>Winfield Hill wrote...
>>>
>>> ... RIS-767 with 20 chopped-up flip-chip
>>> daughterboards is on its way.
>>
>> Have found two errors on the RIS-767 so far (27May):
>>
>> 1)  U2, an important switch choice, is fine with
>> TI's ts3a24159dg dual 3.3-volt 0.2-ohm spdt.  But
>> the ts5a22362dg dual 5-volt 0.5-ohm spdt is no-go.
>> Awwk, TI swapped the control and NC pins!   This
>> also applies to U27 on flip-chip G: ignore the
>> TS5A22362 silk-screen label and use TS3A24159DG.
>>
>> Haha, ts3a will likely out-perform the ts5a anyway.
>> We may find out, Rob Legg has made cut-jump fixes.
>>
>> 2)  U19, the cute 0.5A MAX17222ELT boost-converter,
>> oops, totally wrong pinout, my fault, no excuse.
>>
>> All the other IC footprint pinouts have passed a
>> double check.   My apologies for the errors.
>>
>> 3)  Not an error exactly, more a typo, but the node
>> marked PWM on the schematic, which travels all over
>> the place, is actually an inverted logic signal,
>> *PWM.   Or fPWM, /PWM, PWM', !PWM, or your choice.
>> (note: R1 and R2 program U1 for inverted-out mode.)
>>
>> 4) My convention, showing switches in their logic-HI
>> position, can be confusing, logic-LO is more common.
>>
>> Updated schematic (with lots of added annotation),
>> plus an errata page will be posted to dropbox.
>> Labels and U19 will be fixed in the next PCB pass.
>> U27 on flip-chip G2 will be rewired for TS5A22362.
>>   
>Win,
>
>Given the recent results for TS5A22362 and ungapped EP13 choke, might
>it not be a good idea to generate some kind of formatted standard test
>report for the RIS767?
>
>This could guide measurement collection procedures/targets, assist in
>the immediate digestion of collected data and be a step in
>coordination of results at a later date.
>
>It would have to be pretty extensive, even perhaps  going as far as to
>include standard equipment lists (serial# ? cal date ?) I'm not
>suggesting a form for recording raw data - that would just be torture.
>
>Sometimes more (iterations) is actually less. You might have to
>request specific trials.......to either avoid duplication or to
>attempt it.
>
>It'd also maybe cut down on explanations/justifications required in
>distribution of 'standard reports' between participants.
>
>Rob Legg

 I think that's a great idea!  Why don't you make one!
 You can populate it with your own data as a test case.


-- 
 Thanks,
    - Win

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Re: Achieving 98% efficiency in a boost converter, RIS-767, errata Winfield Hill <hill@rowland.harvard.edu> - 2017-05-27 10:21 -0700
  Re: Achieving 98% efficiency in a boost converter, RIS-767, errata legg <legg@nospam.magma.ca> - 2017-06-17 15:46 -0400
    Re: Achieving 98% efficiency in a boost converter, RIS-767, errata Winfield Hill <hill@rowland.harvard.edu> - 2017-06-17 16:20 -0700
      Re: Achieving 98% efficiency in a boost converter, RIS-767, errata legg <legg@nospam.magma.ca> - 2017-06-19 11:50 -0400
      Re: Achieving 98% efficiency in a boost converter, RIS-767, errata legg <legg@nospam.magma.ca> - 2017-06-19 11:57 -0400
        Re: Achieving 98% efficiency in a boost converter, RIS-767, errata Winfield Hill <hill@rowland.harvard.edu> - 2017-06-20 12:28 -0700

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