Electronics > Beginners

How to add soft-start feature to a PSU?

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Arjunan M R:

--- Quote from: exe on June 23, 2019, 07:29:10 am ---As for MCU, for my PSU I chose stm32f373 as it has three DACs and and two or so 16bit ADC (datasheet claims 14bits noise-free). This way I reduced BOM, and avoided i2c/spi devices (and writing drivers for them). But I'm yet to finish the project, so not sure how the MCU is good for the job.

--- End quote ---
Stm32 is expensive.
I will stick with what i have to keep the cost down.

Arjunan M R:

--- Quote from: exe on June 23, 2019, 07:29:10 am ---Q6 doesn't look right to me, too big for the job, imho. Why not using something smaller? Gate capacitance can be a stability problem if PSU supports CC mode.


--- End quote ---
Yeah I might want to change the MOSFET.
Its input capacitance is 1470pF :-\.
I have a pull down resistor of 4K7 at the input.
So, it will take 4 µs to turn on or off the MOSFET. It's a lot. I will change the MOSFET.

Arjunan M R:

--- Quote from: exe on June 23, 2019, 07:29:10 am ---I think paralelling D2 and D8 is redundant, imho. A uni-directional TVS would work the same, imho. What was the reason behind it?

--- End quote ---
Yes a unidirectional TVS would work fine |O.

TheHolyHorse:

--- Quote from: Arjunan M R on June 23, 2019, 08:03:50 am ---
--- Quote from: exe on June 23, 2019, 07:29:10 am ---As for MCU, for my PSU I chose stm32f373 as it has three DACs and and two or so 16bit ADC (datasheet claims 14bits noise-free). This way I reduced BOM, and avoided i2c/spi devices (and writing drivers for them). But I'm yet to finish the project, so not sure how the MCU is good for the job.

--- End quote ---
Stm32 is expensive.
I will stick with what i have to keep the cost down.

--- End quote ---

Well not really, the STM32F373 cost less than MCP3421A0T-ECH and MCP4922 combined and you'll get everything in one package. And as exe stated higher precision SDADC and IIRC the internal DACs are also better.

Arjunan M R:

--- Quote from: TheHolyHorse on June 23, 2019, 10:09:23 am ---
--- Quote from: Arjunan M R on June 23, 2019, 08:03:50 am ---
--- Quote from: exe on June 23, 2019, 07:29:10 am ---As for MCU, for my PSU I chose stm32f373 as it has three DACs and and two or so 16bit ADC (datasheet claims 14bits noise-free). This way I reduced BOM, and avoided i2c/spi devices (and writing drivers for them). But I'm yet to finish the project, so not sure how the MCU is good for the job.

--- End quote ---
Stm32 is expensive.
I will stick with what i have to keep the cost down.

--- End quote ---

Well not really, the STM32F373 cost less than MCP3421A0T-ECH and MCP4922 combined and you'll get everything in one package. And as exe stated higher precision SDADC and IIRC the internal DACs are also better.

--- End quote ---
Yeah , but then I have to buy the programmer and learn how to programm it.

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