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I know - but there was just not enough space left :bang:
So this does actually mean, that the first opamp is useless?
Does this affect the current control loop of the LTC4020? According to the datasheet the CSOUT pin has an output impedance of 100k.
That was the reason why i placed the...
Hi Klaus,
sorry for the late reply - Project was on hold during vacation time...
I missed that - you are right. That would result in terrible drifts...
So the analog part now has its own 5V regulator and the DAC is configured to use its internal reference voltage of 4.096V.
Here is the...
Hello Klaus,
thank you for your reply!
I also thought this could be a much easier and cheaper solution. But the VFBmin/max pins also needs to be adjusted in the same way. So i would need that mux two times.
I would also like to support all chemistry's, the LTC4020 is able to charge. So i...
Hello,
here are the related schematic parts together with my questions:
First: voltage adjustment using DAC
Questions:
1. Possible that way? I am not sure if i understand the battery stack voltage programming part correctly.
2. Is the series resistance of 8k3 (R306 ... R309) enough to...
Forum EDA:
Hello treez,
its not necesarry for me to parallel converters, because the maximum charge current capability of 10A is only needed, if the input voltage is 24V or higher.
If the input voltage is to low, so that the inductor current would rise above 25A (limit set by sense...
Hello Klaus,
after some time spend over the datasheet and some more calculations we had success with inductor selection.
Analog devices also confirmed our component selection.
We are currently about to finishing the schematics.
Last step is to implement the digital adjustment from uC. So i...
Hello Klaus,
thank you for your reply!
What did
average current here actually mean?
Is the average current the design current of 10A or is it the value calculated by:
For Step Down:
Iin is not known!? - But the datasheet also says:
-> so here i could simply go with the 10A, right?
For...
Hello,
i am about to design a buck boost Battery Charger with the LTC4020.
Design requirements:
- 10A charge current
- charge current adjustable
- 10V ... 48V input voltage
- different types of batterys (1s ... 12s LiPo, 6V, 12V, 24V lead accid -> adjustable output voltage range: 3V ... 53V)...
You are right, the LTC4020 should not be in intsant on mode.
Its also a little bit strange, that the battery float voltage is setup, while the battery is disconnected.
The voltage should be 29.05V while battery is connected and about 31.95V (Vfloat * 1.1) while disconnected.
Maybe your input...
What voltage does the battery have in this case?
Maybe this is the instant-on feature of the LTC4020? Set by R48 and R49.
With the populated values (R48 = 24k; R49 = 255k) you should get:
Vmax ~ 31,96V
Vmin ~ 24,70V
So if the battery is below Vmin the LTC4020 regulates the BGATE pin to get a...
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