| 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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