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I've searched extensively on TI website looking for something like a Buck switcher designed as a battery charge controller, with features such as external FET to reach 5-10A charge current, CC/CV two stage charge profiles, EOC timers, pre-charge current limiting etc for Li-ion chemistry. However key to my requirement is 60V input supply voltage and a charge voltage that can reach the same.
I have not found any suitable IC. Did I miss something? Perhaps TI has some recommendations of how to use lower voltage ICs to operate from these high voltage levels.
Thanks in advance.
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In reply to Jeff F:
That's not ideal actually as I will just need to step back up again using a buck/boost charger. Inefficient and more complex and costly. The battery is also 60V (16S Li-ion)
In reply to Aidan Walton:
Actually this is kinda where I'm looking for a pointer. Currently I am strongly considering an alternative supplier (Linear) they recently introduced a mult-chemistry rather simple (low component count) effective charge controller that operates directly from up to 60V. Unfortunately they do not have a transient spice model for it and it also does not support programmable current. So only ON/OFF control.
I would be happy to consider a modified TI design as I am doing all my existing modelling inside TINA-TI. This would be especially true if you have transient models available for the device.
I'm still working on the ORing supply that switches battery or mains, this is almost complete, after which I will integrate the charging functions. So if you could perhaps suggest something that you might be reasonably confident would work, I will work on it next.
Li-ion support for over 15S cells. i.e operating voltage 42-63 V
Low charge current limiting (Pre-charge function)
Programmable (MCU controlled) charge current ( to allow different charge profiles from a mains power source that is not specified to deliver full system load and full charge current simultaneously. )
Timed EOC cut-off.
Reverse current protection. In case battery voltage is above charge voltage. And related, a charge algorithm that can deal with a potentially regular droop in the supply voltage ( this could be heavily loaded by the system and in extreme conditions the supply voltage to the charger may fall below the battery voltage for a few mS, especially if the battery is fully charged.
If you have a little time your experience would be very much appreciated. Otherwise I shall probably opt for the other manufacturer.
All the bestAidan
Battery Charger Solutions
In reply to ezhao:
Aidan, Wish you can successfully implement the CC/CV on your current LLC converter.
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