LM25141: Super Cap Charger

Derek Xie

Genius 12255 points

Part Number: LM25141
Other Parts Discussed in Thread: INA168

Hi Team:

Whether this par can support Super Cap charge? If yes, could you share the schematic to me? Thanks.

over 8 years ago

0 Piotr F. over 8 years ago

TI__Intellectual 2910 points

Hi Derek,

I'm forwarding your question do David Baba.

In a meantime, could you provide supercapacitor charging voltage?

We'll get back to you soon,

Piotr

0 David Baba over 8 years ago

TI__Mastermind 39980 points

Hello,

We do not have an actually example to share using the LM25141. But you can use a typical scheme to implement CC feedback.

Suggest looking at the INA168.

The only caveat is that the bottom FB resistor RL>5k. if the Constant voltage stage does not need to be very accurate can just use a Zerner clamp from Vout to RL Hope this helps?

0 Derek Xie over 8 years ago in reply to David Baba

TI__Genius 12255 points

Hi Baba:
Would you please provide a rough schematic to me? So I can modify through customer requirement. Thanks.

0 David Baba over 8 years ago in reply to Derek Xie

TI__Mastermind 39980 points

The example attached is used for a boost converter, but the output current sense stage can be used on a buck topology.

Please note that the attached is only a concept. One will need to modify to suit the needs of the system and specification.

In the attached recommend depopulating Rx1 and installing the two Zeners (Vclamp voltage). Note that the output accuracy will not be precise as it will rely on the two series Vzener voltages.

Hope this helps?

Super cap CC to CV charger.pdf

Power management

Power management forum

LM25141: Super Cap Charger