[time-nuts] Re: Death of a Capacitor

[Magnus Danielson]

Hi,

On 2021-09-27 16:28, Lux, Jim wrote:
> On 9/27/21 7:22 AM, John Ackermann N8UR wrote:
>> Indeed, Dana.  Texas Instruments has a nice "designer workbench" for 
>> their switching regulators like the TPS53400 to help select the 
>> components.  Using that worked much better than trying to follow the 
>> data sheet circuits.
>>
>> I also found that high ESR caps, particularly on the output, are 
>> important.  And also that you don't want to slowly ramp up the input 
>> voltage for testing, as the thing will start sqealing if fed with 
>> voltage way below the output.  You want a quick start at the working 
>> input voltage. 
>
>
> yes, you don't want to be too "soft start" on the upstream converter.

Indeed. It may result in brown-out like conditions and creat wonderful 
magic states in equipment. Another similar enough thing is 
power-sequence, enabling power up in the right sequence.

It's not the old "predictable" TTL designs anymore.

Cheers,
Magnus