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tech / sci.electronics.design / Re:TPS54302 again

SubjectAuthor
* TPS54302 againjlarkin
+* Re: TPS54302 againPhil Hobbs
|`- Re: TPS54302 againjlarkin
`- Re:TPS54302 againMartin Rid

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TPS54302 again

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From: jlar...@highlandsniptechnology.com
Newsgroups: sci.electronics.design
Subject: TPS54302 again
Date: Thu, 13 Jan 2022 08:04:22 -0800
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 by: jlar...@highlandsniptechnology.com - Thu, 13 Jan 2022 16:04 UTC

TPS54302 is a wonderful little synchronous switcher chip.

3 amp switcher in SOT-23, under a dollar. It does radical
spread-spectrum pwm but the dc output is quiet.

We're designing a small box that contains about 400 power relays. To
reduce coil power, we'll run the relay coils at 12 volts and bump them
up to 24 briefly when we change setups. One issue is whether the
switcher can switch 24 to 24, full on, without its bootstrap cap
discharging. The TPS makes a tiny blip once in a while to recharge the
cap. It seems to do everything right.

They do get pretty warm at 3 amps.

We've done a lot of testing on the eval board.

https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1

https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1

--

I yam what I yam - Popeye

Re: TPS54302 again

<76720c00-d81b-7353-7500-94ec92ed4c2f@electrooptical.net>

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NNTP-Posting-Date: Thu, 13 Jan 2022 10:47:06 -0600
Subject: Re: TPS54302 again
Newsgroups: sci.electronics.design
References: <9ji0ugdsbuorccf70jppu8gnc56kdcrlvi@4ax.com>
From: pcdhSpam...@electrooptical.net (Phil Hobbs)
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Date: Thu, 13 Jan 2022 11:47:03 -0500
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 by: Phil Hobbs - Thu, 13 Jan 2022 16:47 UTC

jlarkin@highlandsniptechnology.com wrote:
> TPS54302 is a wonderful little synchronous switcher chip.
>
> 3 amp switcher in SOT-23, under a dollar. It does radical
> spread-spectrum pwm but the dc output is quiet.
>
> We're designing a small box that contains about 400 power relays. To
> reduce coil power, we'll run the relay coils at 12 volts and bump them
> up to 24 briefly when we change setups. One issue is whether the
> switcher can switch 24 to 24, full on, without its bootstrap cap
> discharging. The TPS makes a tiny blip once in a while to recharge the
> cap. It seems to do everything right.
>
> They do get pretty warm at 3 amps.
>
> We've done a lot of testing on the eval board.
>
> https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1
>
> https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1
>
>
>
>
Nice. When running from a lowish input rail, I sometimes use a 10k
resistor from the bootstrap pin to some higher supply to reduce the ON
resistance.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Re: TPS54302 again

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NNTP-Posting-Date: Thu, 13 Jan 2022 12:02:03 -0600
From: jlar...@highlandsniptechnology.com
Newsgroups: sci.electronics.design
Subject: Re: TPS54302 again
Date: Thu, 13 Jan 2022 10:02:05 -0800
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 by: jlar...@highlandsniptechnology.com - Thu, 13 Jan 2022 18:02 UTC

On Thu, 13 Jan 2022 11:47:03 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> TPS54302 is a wonderful little synchronous switcher chip.
>>
>> 3 amp switcher in SOT-23, under a dollar. It does radical
>> spread-spectrum pwm but the dc output is quiet.
>>
>> We're designing a small box that contains about 400 power relays. To
>> reduce coil power, we'll run the relay coils at 12 volts and bump them
>> up to 24 briefly when we change setups. One issue is whether the
>> switcher can switch 24 to 24, full on, without its bootstrap cap
>> discharging. The TPS makes a tiny blip once in a while to recharge the
>> cap. It seems to do everything right.
>>
>> They do get pretty warm at 3 amps.
>>
>> We've done a lot of testing on the eval board.
>>
>> https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1
>>
>> https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1
>>
>>
>>
>>
>Nice. When running from a lowish input rail, I sometimes use a 10k
>resistor from the bootstrap pin to some higher supply to reduce the ON
>resistance.
>
>Cheers
>
>Phil Hobbs

That's another way to keep the highside fet on forever. In our case,
we have no higher voltage available.

--

I yam what I yam - Popeye

Re:TPS54302 again

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From: martin_r...@verison.net (Martin Rid)
Newsgroups: sci.electronics.design
Subject: Re:TPS54302 again
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 by: Martin Rid - Fri, 14 Jan 2022 00:20 UTC

jlarkin@highlandsniptechnology.com Wrote in message:r
> TPS54302 is a wonderful little synchronous switcher chip.3 amp switcher in SOT-23, under a dollar. It does radicalspread-spectrum pwm but the dc output is quiet.We're designing a small box that contains about 400 power relays. Toreduce coil power, we'll run the relay coils at 12 volts and bump themup to 24 briefly when we change setups. One issue is whether theswitcher can switch 24 to 24, full on, without its bootstrap capdischarging. The TPS makes a tiny blip once in a while to recharge thecap. It seems to do everything right.They do get pretty warm at 3 amps.We've done a lot of testing on the eval board.https://www.dropbox.com/s/jban5vjybbb2g77/TPS54302_PWM.JPG?raw=1https://www.dropbox.com/s/etctkh2rzesockj/TPS54302_spectrum.JPG?raw=1-- I yam what I yam - Popeye

I use the tps69xxx, nice little part. Lots of current for a small
part.

Cheers
--

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