LT3652 design question

[Ajay Renganathan]

Hello all.

I have a question regarding the editing of the LT3652 test circuit.

I am trying to charge a 12V 7Ah SLA battery(Max 2.1A, Float vtg 13.5V) using a 10W Solar panel (Voc=21V, Isc=0.6A, Vmp=17.6V Imp=0.57A).

The test circuit is for an input of 16V and output current of 1A and voltage of 11.7V(as seen from the waveform after simulating).

I require a min. input voltage of 17V and need to charge the battery with the given specs above. I edited the voltage divider to get the input voltage as well as the Rsense resistor to set the maximum current as 2A.

I'm getting an output voltage of 9.9V though. I know that .ic is for initial conditions but when I change that value I get the same changed value as the output voltage. I am not able to see the voltage increasing to the float voltage in this circuit whereas in the test circuit I am able to.

Is there some mistake that I've made? Can anyone help me out with what I need to do?

 

[andre_luis]

Can you upload the .asc circuit here ?

 

[Ajay Renganathan]

I'm trying to upload the .asc file but it says invalid file type and doesn't let me upload it. If you want the circuit it is the image titled "test".

 

[FvM]

I'm trying to upload the .asc file but it says invalid file type

That's true. Thus you'll either zip the file or change the extension to *.txt.

 

[Ajay Renganathan]

Ok here's the .asc file.