www.national.com/pf/LM/LM3647.html
www.qsl.net/eb4eqa/batt_charger/batt_charger.htm
www.maxim-ic.com/quick_view2.cfm/qv_pk/1666
Rick
Adi Linden wrote:
> I thought I had seen an appnote for a smart NiCad/NiMH charger quite some
> time ago. I can't seem to find it. Anyone has any pointers?
>
> Thanks,
> Adi
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways. See http://www.piclist.com/#archives for details.
Maxim web site has a number of app notes on their line of NiMH charger ICs;
and they call them smart although it is a pretty subjective description for
a charger IC.
Madhu
----- Original Message -----
From: "Adi Linden" <spam_OUTadilTakeThisOuTADIS.ON.CA>
> I thought I had seen an appnote for a smart NiCad/NiMH charger quite some
> time ago. I can't seem to find it. Anyone has any pointers?
I built a nice NIMH charger with the MAX712/MAX713 from Maxim. The two
chips are nearly identical, one is optimized for NIMH and the other for
NiCD. I have several PDFs on charging NiMH from various sources, the best
being Panasonic. I can send them to you off the list, or you can google
on Panasonic Batteries and probably find them pretty quick.
The 712 works very well for a fixed number of cells. If you are doing
anything very fancy, it may not serve. Some people on the list developed
a PIC-based solution that had more options. However, I liked the
simplicity and straightforwardness of this chip and it served my needs
perfectly.
One can be substituted for the other. I believe the MAX712 terminates on
zero slope, whereas the 713 terminates on negative slope.
Table 1 of the data sheet actually recommends the mAx713 for both NiCD and
NiMH when charrging at rates above C/2 and terminating on slope and/or
temperature. I used a max713 on NiMH batteries at fast charge rates.
I've used the MAX713 and found it to work great with NiCads. I am looking
at charging 6 cell battery packs. Unfortunately they could be NiCad or
NiMH, so I need to be able to easy switch between. With the MAX712/713 I
would have to change chips which isn't really feasible.
ADIS.ON.CA>