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Part Number: UCC38C43
I was wondering if anyone can help come up with the appropriate TI parts to design a simple Buck Boost using the UCC38C43.
input : 12 to 30 VDC
Output: 0 to10 Amps
3 segment display with a divide by 10 switch to display mA.
Rotary encoder for accurate D/A output current control.
If there is a TI reference design I can go by, that would be great.
With best regards,
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In reply to Colin Gillmor:
Thank you so much for the information. I got a reference design and it looks like it is what I am looking for. Do you know if there is a way to put three of the reference design on one board?
I also need to tap into the output current control.
In reply to Alfred Oraha:
Thank you so kindly for your reply. I was stationed out of town for 10 days and could not reply back. I worked off of the workbench and I could not get a current limiter configuration to come up. I saw switching flyback power supplies and buck/boost configurations. I wanted to know how I can configure the UCC38C43 to output Adjustable current via the negative leg out of a N channel MOSFET. See attached sketch.
I appreciate any help.
My apologies for not replying to you earlier. I think you are trying to develop a PSU with a constant current output and this can be done with the UCC38C43 as shown here. Tying FB to GND will cause COMP to default high and the two OPAMPs act as error amplifiers and can pull COMP low to modulate the voltage at the pin. The COMP pin is essentially a current demand signal into the PWM comparator. The data sheet shows the COMP being used in this way in Fig 29 (Typical Offline Application)
This is a variation on the scheme shown in the second image below and will give you a CI characteristic with a Voltage limit.
Please let me know if you need any more information.
The images didn't attach to the post even though they were CLEARLY VISIBLE when I pressed the POST button -
Third time lucky - I hope
Maybe the fourth time :-)
If the images are not visible then please send me an email and I'll forward them on to you. I'm at firstname.lastname@example.org
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