Electronics > Projects, Designs, and Technical Stuff
PSA: do not use the TPS61099 boost reg in your designs
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SiliconWizard:

--- Quote from: splin on January 23, 2019, 01:25:05 pm ---
--- Quote from: SiliconWizard on January 22, 2019, 08:32:06 pm ---Reading the datasheet, we can see it's got quite a few different modes of operation. Between the soft-start feature, the "down mode", "pass-through", bust mode and synchronous mode...

--- End quote ---
Ah, that must be the one the OP was using.

--- End quote ---

Ahah, this typo was unintentional but that's a good one. ;D
SiliconWizard:
I suggest the LTC3528 as an alternative. Linear has never failed me.

Bassman59:

--- Quote from: BrianHG on January 23, 2019, 04:29:17 am ---With TI, it's not just their power management ICs.  Their new norm on documentation SUCKS shit.  On their clocking ICs, I tried to get information as their formulae in the data sheet made no sense and had non-standard characters.  I was told from TI support, just use their PC configuration app to get the IC2 configuration settings.  NO... The IC said I can program any frequency I wanted, both setting the reference and feedback dividers and their config software didn't always make the most stable oscillator configuration unless I manually tweaked it.  Their own engineers couldn't decipher their own documentation...  It took 5 days and a few friends who specialized in math and physics to reverse engineer the notation in their .pdf data sheet and to get the IC to dynamically be programmed to do exactly what I want.
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I've been using the Silicon Labs clock ICs (synthesizers, etc etc) and while you have to use the Clock Builder software, the parts behave and the support has been responsive (don't use the forum, just send email to their support staff).



--- Quote ---I also found bugs in a few of their other ICs. 
--- End quote ---

I have an issue with their not-new-anymore audio SRC chip, its receiver simply won't lock on S/PDIF signals whose sample rate is a multiple of 44.1 kHz. The 48 kHz family works fine. At least the support guy is honest: "none of the people on the design team work here any more." Still, there's no help and no support. This is why I haven't considered their microcontrollers for anything, even now that they've made the development tools free.
BrianHG:

--- Quote from: fireworks on January 23, 2019, 09:34:22 am ---
--- Quote from: BrianHG on January 23, 2019, 04:29:17 am ---Their own engineers couldn't decipher their own documentation...  It took 5 days and a few friends who specialized in math and physics to reverse engineer the notation in their .pdf data sheet and to get the IC to dynamically be programmed to do exactly what I want. 

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  Hi Brian,

  Which TI datasheet was that ? I want to take a look at the weird formulas ☺

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I've attached the original cdce925_2007.pdf I had to work with at the time.  See page 21, part 2 and the line after.

I wish I had my notes, this ended up being simplified down to easy.
BrianHG:

--- Quote from: Bassman59 on January 23, 2019, 08:38:36 pm ---
--- Quote from: BrianHG on January 23, 2019, 04:29:17 am ---With TI, it's not just their power management ICs.  Their new norm on documentation SUCKS shit.  On their clocking ICs, I tried to get information as their formulae in the data sheet made no sense and had non-standard characters.  I was told from TI support, just use their PC configuration app to get the IC2 configuration settings.  NO... The IC said I can program any frequency I wanted, both setting the reference and feedback dividers and their config software didn't always make the most stable oscillator configuration unless I manually tweaked it.  Their own engineers couldn't decipher their own documentation...  It took 5 days and a few friends who specialized in math and physics to reverse engineer the notation in their .pdf data sheet and to get the IC to dynamically be programmed to do exactly what I want.
--- End quote ---

I've been using the Silicon Labs clock ICs (synthesizers, etc etc) and while you have to use the Clock Builder software, the parts behave and the support has been responsive (don't use the forum, just send email to their support staff).



--- Quote ---I also found bugs in a few of their other ICs. 
--- End quote ---

I have an issue with their not-new-anymore audio SRC chip, its receiver simply won't lock on S/PDIF signals whose sample rate is a multiple of 44.1 kHz. The 48 kHz family works fine. At least the support guy is honest: "none of the people on the design team work here any more." Still, there's no help and no support. This is why I haven't considered their microcontrollers for anything, even now that they've made the development tools free.

--- End quote ---
I'm sorry but TI's forum didn't yet exist in 2007, or didn't have anyone useful there when I was working on the stuff.
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