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

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From	Winfield Hill <hill@rowland.harvard.edu>
Newsgroups	sci.electronics.design
Subject	Re: Achieving 98% efficiency in a boost converter, RIS-767, errata
Date	27 May 2017 10:21:18 -0700
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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.
    


-- 
 Thanks,
    - Win

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Thread

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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