Adjustable smps

Jon Bean1

Other Parts Discussed in Thread: TPS62147

I want to design a smps with an output that can be adjusted from around 0.5V to 5V at 2A. Are there any TI ref designs that could be adapted to do this? Or does anyone know of any parts that would be suitable?

Thanks

over 7 years ago

0 Kuan Wei Chen (Kevin Chen) over 7 years ago

TI__Genius 9710 points

Dear Jon,

Thanks for interested in TI's solution.
Please provide more information as below:
1.What is the input voltage range, DC, AC, max, min?
2.Need isolation for input and output?
3.Do you have any preference to adjust the output voltage, is variable resistance work for you?
4.Is necessary to be SMPS or lower efficiency LDO is acceptable?
5.Do you concern the design price, efficiency or switching frequency?
Or anything else can help me have better understand your design are appreciate.

Best Regards
Kevin

0 Jon Bean1 over 7 years ago in reply to Kuan Wei Chen (Kevin Chen)

Expert 1130 points

Hi Kevin

I need to design a dc supply. I have 12V available for the input but could have some regulation to drop it down.

I dont need any isolation between the input and output.

In terms of adjusting the output, I need to be able to adjust it from a micro controller. As long as I can do that i dont mind on the implementation.

If an LDO could do that job that that would be fine. the reason I was thinking SMPS is due to the power dissipation.

Price and switching frequency doesn't matter.

What I am trying to do is create a power supply that has low noise <1mV to power a peltier cooler for a image sensor. I need to be able to control the output voltage to be able to control the temperature of the cooler. At the moment I am using a PWM controller but its too noisy (26mV ripple) which is causing issues with the image sensor data.

Thanks

Jon

0 Chris Glaser over 7 years ago in reply to Jon Bean1

TI__Guru**** 150710 points

Hi Jon,

The TPS62147 can meet your power needs. You can adjust Vout by the method shown here: www.ti.com/.../slva251.pdf

Let me know if this works for you.

0 Jon Bean1 over 7 years ago in reply to Chris Glaser

Expert 1130 points

Hi Chris

That looks like in could be suitable, its just if I can get the noise low enough.

Thanks

Jon

0 Chris Glaser over 7 years ago in reply to Jon Bean1

TI__Guru**** 150710 points

Hi Jon,

You can test an EVM to start with and add a second stage filter, if needed, as described here: e2e.ti.com/.../design-a-second-stage-filter-for-sensitive-applications

Power management

Power management forum

Adjustable smps