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

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yefj

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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)
Thanks.
1712738444754.png
 
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yefj said:
COuld you please make some drawing so i'll understand the logic?
Click to expand...
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
 
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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.

1713001921913.png

--- Updated ---

UPDATE:
Yes i got it .
1713002502974.png
 
Last edited:
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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?



1713013757673.png


1713013542470.png
 
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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.
 
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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?
 
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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.
 
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Well, yeah, the job has to be done. But I did this very job
with about 300x300um silicon area.

1713308574287.png


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.

1713308848450.png


1713309348620.png



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

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