>----- Original Message ----- >From: "Michael Rigby-Jones" >To: "Microcontroller discussion list - Public." >Sent: Friday, January 06, 2006 6:00 PM >Subject: RE: [EE] Sealed Lead Acid charger~~ > > >| How about MOSFETs on the output of the regulator to >disconnect it from >| the >battery when no input voltage is present? Something with a >nice low Rds(on) should (in my head at least!) cause minimal >regulation impairment compared to a diode. Or even, *shock >horror*, a good old electro-mechanical relay? >| >| How about the old LM723, cheap with built in current >limiting, through >will need an external pass transistor for the kind of currents >you require. >-----Original Message----- >From: Enrico >Sent: 06 January 2006 18:41 >To: Microcontroller discussion list - Public. >Subject: Re: [EE] Sealed Lead Acid charger~~ > >How about a simple, dedicated IC like the Philips TEA1102? >There is a PCB in the documentation, switchable for NiCd, >NiMh, LiIon and SLA (from .5C to 5C)... and it's cheap... > >If you don't find the data sheet I can send it... According to the Philips website that part is discontinued. A quick scan of the datasheet didn't show any obvious data for battery discharge currents with no supply to the IC, or even if that was a valid state. Might be buried in there somwhere though as it looks quite a comprehensive datasheet. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist