Electronics > Beginners

How to add soft-start feature to a PSU?

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Arjunan M R:

--- Quote from: TheHolyHorse on June 22, 2019, 02:54:24 pm ---Nice to hear I'm not the only one :) I'm actually working on a PSU as well, it's all layout all I have to do is order the PCB but I'm a bit hesitant. It feels like I've done something wrong, but there's only one way to know isn't it :).

Anyway I'm not gonna ramble about my stuff, lets stay on topic.

--- End quote ---
it's "it's all laid out" not "it's all layout" ;D.
I am designing the PCB right now.
All the components are laid out.I have to now rout 300+ connections :phew:(most of em are GND and VCC and I already connected about 75)

Arjunan M R:

--- Quote from: Arjunan M R on June 22, 2019, 03:29:08 pm ---
--- Quote from: TheHolyHorse on June 22, 2019, 03:02:58 pm ---As for the topic, can't you just set the voltage slowly. I assume you're gonna control everything with some micro so doing that in software will be ezpz.

--- End quote ---
Yeah, but the code is already complicated enough for me.With 3 devices on I²C and 1 on SPI :phew:.
I am trying to do most of the things in the hardware side as possible.

--- End quote ---
And an 16X2 LCD  :-\

David Hess:
The common way is to delay the startup of the reference, maybe with an under-voltage lockout, or limit the rise time of the reference voltage applied to the error amplifier.

Arjunan M R:

--- Quote from: TheHolyHorse on June 22, 2019, 02:54:24 pm ---Nice to hear I'm not the only one :) I'm actually working on a PSU as well, it's all layout all I have to do is order the PCB but I'm a bit hesitant. It feels like I've done something wrong, but there's only one way to know isn't it :).

Anyway I'm not gonna ramble about my stuff, lets stay on topic.

--- End quote ---
I am also having that feeling of I have done something wrong or stupid.

Arjunan M R:

--- Quote from: David Hess on June 22, 2019, 03:36:54 pm ---The common way is to delay the startup of the reference, maybe with an under-voltage lockout, or limit the rise time of the reference voltage applied to the error amplifier.

--- End quote ---
That error amp is for current not voltage:

Or are you talking about this:

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