Hello Aggil
A CI/CV characteristic can be done using the technique shown here. This technique is used in the review of a 2kW battery charger at https://www.ti.com/seclit/ml/slup348/slup348.pdf
Another example with a full schematic (at 350W) is at http…
Hello Aneesh
If you are building a battery charger then you need a CI/CV characteristic. This cannot be achieved if you use only a current sensor on the input line for a few reasons.
1/ The current limit point is not well defined - typically it will be…
Hi Mikail
The basic CC/CV mode configuration is described in the attached document. This is the method used in the PMP 8740 reference design.
/cfs-file/__key/communityserver-discussions-components-files/196/8117.CI_5F00_CV.docx
This gives you a constant…
Hello Bhushan
The Infineon design looks good but it is for a general purpose PSU rather than a battery charger. The main difference is that the Infineon design uses the input current rather than the output current and the result is that you get a constant…
Hello Hanif
Yes, I remember you - welcome back !
I've attached an explanation of the two error amplifiers are used to get a CI/CV system. The term 'Lowest error wins' really just means that only one of the two error amplifiers has control of the EA+ pin…
Hello Rock
Texas Instruments does not recommend that the COMP pin of the UCC28950 (or UCC28951) be used as an input. In the customer schematic the LM324 IC is being used to drive the COMP pin as an input so we cannot recommend this approach.
The usual…
Hi,
At 45V, 20A its a 900W supply, if the output voltage has to be variable between 4.4V to 45V then I recommend you use a two stage approach.
A single phase PFC, using the UCC28180, TI has a 900W design TIDA-00443 which could be used with a phase…
Hello Rock
This schematic is closer to what is needed but there are still a few small points that should be changed.
1/ The on-board error amplifier of the UCC28950 should be configured as a voltage follower. EA- connected to COMP and the output of the…