recomendation for microcontroller programmed DC-DC suited for power amplifier sequencer

[yefj]

Hello, There is an amplifier I want to create a sequencer for shown in the link below.
The most problematic thing to do is the a proper delay line between the signals ,so i want to use a programmable microcontroller to turn on and off the DC-DC when needed.
Is there a programmable DC-DC converter you could recommend which could power my amplifier ?(preferably a device which works with SPI protocol)

https://www.minicircuits.com/pdfs/PMA5-83-2W-D+.pdf

Thanks.

 

[KlausST]

COuld you please make some drawing so i'll understand the logic?

Dana already wrote it in post#16. Just connect them.

I wonder about such a basic question from a 5-years member of an electronics forum.

Klaus

 

[yefj]

Hello Klaus, purely on the threshold level.I have several similar components for example for LTC1261cs8-4 I see the maximal rating below which the component will be burned.
How do i see the voltage level for the SHDN for which it is ON and what voltage level it is OFF?
Thanks.

https://www.analog.com/media/en/technical-documentation/data-sheets/1261fb.pdf

--- Updated Apr 13, 2024 ---

UPDATE:
Yes i got it .

 

[yefj]

Hello,I have tried to simulate the SHDN with 0-3.3 pulse as shown below.
when i give it 0V its desabled .when it turn 3.3V then it starts moving towards -4V .
However when i put SHDN back to 3.3 the out stays -4V.
When i added a mosfet to discharge the output to GND the discharge works but the output reaches only -0.6V.
What could be done?

https://www.analog.com/en/products/ltc1261.html?ADICID=SYND_WW_P682800_PF-octopart

 

[barry]

This just gets more and more foolish. You're using an N-channel MOSFET to discharge a cap. The intrinsic diode of the MOSFET is the only thing that's going to discharge the cap. Otherwise, the MOSFET is doing nothing.

 

[dick_freebird]

Why do we keep trying to involve microprocessors and
DC-DC controllers in this simple switch-and-op-amp
problem? What is the motivation for the ever-expanding
circle instead of a direct stab at what the RF part / lineup
wants?

 

[danadakk]

The 100 unit price of the amp OP is trying to protect is ~ US $120.

I still think advocate an intelligent approach where a V is applied, then result confirmed, on to
the next act/confirm step, is rational and appropriate.

As well as when operational monitoring.

This design begs reliability....


Regards, Dana.

 

[dick_freebird]

Well, yeah, the job has to be done. But I did this very job
with about 300x300um silicon area.

It really is just a big ol' switch and an itty bitty op amp, some
resistors and loose FETs. The voltage safety sense took 9
transistors and 3 resistors. It works all by itself when the drain
switch turns on and Vgg (VC) is present. Drain switch turnon is
inhibited unless VC is adequate.

Oh, yeah... and those quad space-grade Teledyne hybrids this
sits in the center of, you can probably add a zero or two to the
price... this customer wasn't just fooling around.

 

[yefj]

Hello Barry could you recommend me a BJT I could try to discharge my output with ?
Thanks.

 

[FvM]

Have you forgotten that you started another thread that exclusively discusses LTC1261 related problems?

LTC1261 controlled by SHDN discharge problem

Hello , I am trying to implement the response of DC-DC circuit shown in the attached link. Its a pure simulation functionality issue. I put a pulse into SHDN which in real life will be GPIO periphery of MCU. As you can see when I put 3.3V the DC-DC is not responding. When SHDN=0 its start...

www.edaboard.com

That was basically correct because the latest discussions have nothing to do with microcontrollers.