Generally this fet is internal and thus well known.
On Mon, 27 Sep 2021 11:57:19 +0200
Gerhard Hoffmann wrote:
>
> Am 27.09.21 um 10:16 schrieb n...@lazygranch.com:
> > I've only designed one LDO as a discrete chip (as opposed to a
> > portion of a chip where performance just has to be good
Did you mean low ESR?
A good switcher design will have an undervoltage lockout.
There are a few groups that test a chip before release. One is the
applications group. They will put the DC/DC on a bench supply and
slowly dial up the voltage. Everything needs to behave at any voltage
withing
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
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
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
One other thing to consider with LDOs: some types can go unstable and
oscillate with
the wrong (combination of) capacitors on input and output. So any time you
design in
an LDO, it is important to closely scrutinize the datasheet and application
note(s) and
heed their warnings. Unless you like
On 9/27/21 2:57 AM, Gerhard Hoffmann wrote:
Am 27.09.21 um 10:16 schrieb n...@lazygranch.com:
I've only designed one LDO as a discrete chip (as opposed to a
portion of a chip where performance just has to be good enough), so I
have no guru status. That said, what spikes pass through a LDO if
Gerhard Hoffmann writes:
> Where it really counts is in the low Hz region, when even costly 1uF
> show barely any effect.
Do not overlook that electrolytics are variable capacitors, depending
on pretty much anything and therefore may increase noise in the
up-to-around-a-Hz domain.
Am 27.09.21 um 10:16 schrieb n...@lazygranch.com:
I've only designed one LDO as a discrete chip (as opposed to a portion
of a chip where performance just has to be good enough), so I have no
guru status. That said, what spikes pass through a LDO if you do it
right is simply a capacitor
I've only designed one LDO as a discrete chip (as opposed to a portion
of a chip where performance just has to be good enough), so I have no
guru status. That said, what spikes pass through a LDO if you do it
right is simply a capacitor divider comprised of the capacitance across
the pass device
Hi,
For spikes and RF, common ground is a chimera, a bed-time story for
kids. The quicker you learn to understand that "ground wire" or "ground
connection" is just another wire that has resistance, induction, various
offsets and different noise, the "common" part is very much a "Your
Mileage
Hi
Once you put big inductors in the ground path …. it’s not a common ground
anymore.
Bob
> On Sep 26, 2021, at 6:53 PM, Gerhard Hoffmann
> wrote:
>
>
> Am 27.09.21 um 00:34 schrieb Bob kb8tq:
>> Hi
>>
>> If you start dumping major current spikes into a common ground, it’s
>> amazingly
Am 27.09.21 um 00:34 schrieb Bob kb8tq:
Hi
If you start dumping major current spikes into a common ground, it’s amazingly
difficult to
get rid of the results.
First Principles know the law of the conservation of spikes:
Capacitors convert voltage spikes to current spikes.
Inductors
Hi
If you start dumping major current spikes into a common ground, it’s amazingly
difficult to
get rid of the results.
Bob
> On Sep 26, 2021, at 6:21 PM, John Ackermann N8UR wrote:
>
> I got some interesting and unintended data today. I was measuring low phase
> noise oscillators using a
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