Peter / Al, You can find the info here: http://www.electroniccomponents.globalsources.com/MAGAZINE/OVERVIEW.HTM Regards, KF > My apologies Peter, but I had my subscription set up for me. I haven't > got one lying around. A new one is due soon, but if you can give me a > business address I will try and organise one to be sent to you. > > Al > > Peter Homann wrote: > > >>Al, >> >>Can you direct me to where I can subscribe to the magazine. >> >>Cheers, >> >>Peter. >> >>onestone wrote: >> >> >> >>>On nearly all my designs I use a regulator of some kind, mainly to get >>>the most out of a battery while retaining the same supply voltage >>>enabling high speed operation and flash writing. The MAX1724 has an >>>extremely low quiescent current at only 1.5uA, but is limited to 150mA. >>>IT takes input of 0.8 to 5.5V and comes in a range of fixed voltages. >>>For high current I use the MAX1674. It's quiescent current is 16uA, but >>>it can output 1A from an input of 0.7V to Vout. It works with slight >>>overvoltage. >>> >>>I get my batteries from Taiwan. 3.3Ah costs me US$7 in low volume US$5 >>>in 100 off. I get mine through a friend in Asia. The company is called >>>HEcell. The free trade magazine 'ELECTRONIC COMPONENTS ASIA' is an >>>absolute gold mine for stuff like this. >>> >>>Al >>> >>>Frederic Beaulieu wrote: >>> >>> >>> >>> >>>>>From: "onestone" <onestone@ones...> >>>>> >>>>>This is not a Li-poly or Li-ion. These output 3.6V >>>> >>>>and >are capable of >>>> >>>> >>>> >>>> >>>>>very high discharge currents at low temperatures. I >>>>>regularly use these in systems drawing up to 1A. >>>> >>>> >>>>Which one exactly do you use? Are they expensive? >>>>How do you regularize it for a 3V output voltage? I >>>>can see for 5V output (switcher) but I'm not sure for >>>>3V. >>>> >>>> >>>> >>>> >>>> >>>>>170mA is very high for many >battery >>>>>technologies. >>>>> >>>>>Al
DC-DC converter design
Started by ●December 10, 2004
Reply by ●December 14, 20042004-12-14
Reply by ●December 14, 20042004-12-14
onestone wrote: > The free trade magazine 'ELECTRONIC COMPONENTS ASIA' is an absolute > gold mine for stuff like this. You probably mean "Asian Sources Electronic Components" magazine. Been getting it for 4 or 5 years now. Website of Asian Sources is: http://www.asia.manufacturers.globalsources.com/gsol/HOMEPAGES/ASOL/HOME.jsp They also have a online search there. Indrek -- Indrek Rebane | Borthwick-Pignon Electronics Engineer | Tartu Science Park Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu Fax: (+372) 7 383 041 | Estonia indrek@indr... | www.bps.co.ee
Reply by ●December 14, 20042004-12-14
No, I was right, see KF Leongs reply. I had been getting the magazine
for free for many years, but apparently it is now subscription only.
Al
Indrek Rebane wrote:
> onestone wrote:
>
>>The free trade magazine 'ELECTRONIC COMPONENTS ASIA' is an
absolute
>>gold mine for stuff like this.
>
>
> You probably mean "Asian Sources Electronic Components" magazine.
Been
> getting it for 4 or 5 years now. Website of Asian Sources is:
>
http://www.asia.manufacturers.globalsources.com/gsol/HOMEPAGES/ASOL/HOME.jsp
>
> They also have a online search there.
>
> Indrek
>
Reply by ●December 14, 20042004-12-14
Hi Al, onestone wrote: > No, I was right, see KF Leongs reply. KF Leong and I are talking about _same_ magazine.. > I had been getting the magazine for free for many years, but > apparently it is now subscription only. Same here, but I get it twice a year or so, they used to have some kind of promotional offer. To get it on monthly basis one has to subscribe. Never the less, I mostly use online version. Why? Easier to search -- find things faster. Indrek -- Indrek Rebane | Borthwick-Pignon Electronics Engineer | Tartu Science Park Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu Fax: (+372) 7 383 041 | Estonia indrek@indr... | www.bps.co.ee
Reply by ●December 14, 20042004-12-14
Thank for the valuable info about battery! However, I don't understand how you can obtain a regulated 3V with an input voltage between 2.5V & 4.2V (Li-Ion battery). Thanks Fred --- onestone <onestone@ones...> wrote: > > On nearly all my designs I use a regulator of some > kind, mainly to get > the most out of a battery while retaining the same > supply voltage > enabling high speed operation and flash writing. The > MAX1724 has an > extremely low quiescent current at only 1.5uA, but > is limited to 150mA. > IT takes input of 0.8 to 5.5V and comes in a range > of fixed voltages. > For high current I use the MAX1674. It's quiescent > current is 16uA, but > it can output 1A from an input of 0.7V to Vout. It > works with slight > overvoltage. > > I get my batteries from Taiwan. 3.3Ah costs me US$7 > in low volume US$5 > in 100 off. I get mine through a friend in Asia. The > company is called > HEcell. The free trade magazine 'ELECTRONIC > COMPONENTS ASIA' is an > absolute gold mine for stuff like this. > > Al > > Frederic Beaulieu wrote: > > >>From: "onestone" <onestone@ones...> > >> > >>This is not a Li-poly or Li-ion. These output 3.6V > > > > and >are capable of > > > >>very high discharge currents at low temperatures. > I > >>regularly use these in systems drawing up to 1A. > > > > > > Which one exactly do you use? Are they expensive? > > How do you regularize it for a 3V output voltage? > I > > can see for 5V output (switcher) but I'm not sure > for > > 3V. > > > > > >>170mA is very high for many >battery > >>technologies. > >> > >>Al > > > > > > > > > > > > > > __________________________________ > > > > > > > > > > . > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > --------------------~--> > Make a clean sweep of pop-up ads. Yahoo! Companion > Toolbar. > Now with Pop-Up Blocker. Get it for free! > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM > --------------------------------~-> > > > . > > > Yahoo! Groups Links > > > msp430-unsubscribe@msp4... > > > > > > __________________________________
Reply by ●December 14, 20042004-12-14
OK, searched your link, but didn't see a magazine cover anywhere. I
have
been getting it hard copy on a regular basis. Actually I think I got
the last one in September.
Al
Indrek Rebane wrote:
> Hi Al,
>
> onestone wrote:
>
>>No, I was right, see KF Leongs reply.
>
>
> KF Leong and I are talking about _same_ magazine..
>
>
>>I had been getting the magazine for free for many years, but
>>apparently it is now subscription only.
>
>
> Same here, but I get it twice a year or so, they used to have some kind
> of promotional offer. To get it on monthly basis one has to subscribe.
>
> Never the less, I mostly use online version. Why? Easier to search --
> find things faster.
>
> Indrek
>
Reply by ●December 14, 20042004-12-14
Hello Frederic,
> Thank for the valuable info about battery!
> However, I don't understand how you can obtain a
> regulated 3V with an input voltage between 2.5V & 4.2V
> (Li-Ion battery).
For example with a flyback converter that has a secondary winding. But
since input and output voltages are so close together the easier
method might be a SEPIC converter. The major difference between a
SEPIC and a boost converter is one more capacitor and one more
inductor. Then it can generate anything between zero and 'whatever',
or realistically several times the input voltage.
Usually a chip or architecture for boost conversion can easily be
changed to SEPIC. If you'd like to see a schematic look at National's
data sheet for the LM3478, towards the end of the data sheet.
Regards,
Joerg.
Reply by ●December 15, 20042004-12-15
--- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote: > However, I don't understand how you can obtain a > regulated 3V with an input voltage between 2.5V & 4.2V > (Li-Ion battery). Linear Technology has some very nice synchronous buck/boost converters, e.g. LTC3440. http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116 > --- onestone <onestone@b...> wrote: > > > > > On nearly all my designs I use a regulator of some > > kind, mainly to get > > the most out of a battery while retaining the same > > supply voltage > > enabling high speed operation and flash writing. The > > MAX1724 has an > > extremely low quiescent current at only 1.5uA, but > > is limited to 150mA. > > IT takes input of 0.8 to 5.5V and comes in a range > > of fixed voltages. > > For high current I use the MAX1674. It's quiescent > > current is 16uA, but > > it can output 1A from an input of 0.7V to Vout. It > > works with slight > > overvoltage. > > > > I get my batteries from Taiwan. 3.3Ah costs me US$7 > > in low volume US$5 > > in 100 off. I get mine through a friend in Asia. The > > company is called > > HEcell. The free trade magazine 'ELECTRONIC > > COMPONENTS ASIA' is an > > absolute gold mine for stuff like this. > > > > Al > > > > Frederic Beaulieu wrote: > > > > >>From: "onestone" <onestone@b...> > > >> > > >>This is not a Li-poly or Li-ion. These output 3.6V > > > > > > and >are capable of > > > > > >>very high discharge currents at low temperatures. > > I > > >>regularly use these in systems drawing up to 1A. > > > > > > > > > Which one exactly do you use? Are they expensive? > > > How do you regularize it for a 3V output voltage? > > I > > > can see for 5V output (switcher) but I'm not sure > > for > > > 3V. > > > > > > > > >>170mA is very high for many >battery > > >>technologies. > > >> > > >>Al > > > > > > > > > > > > > > > > > > > > > __________________________________ > > > > > > > > > > > > > > > . > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > --------------------~--> > > Make a clean sweep of pop-up ads. Yahoo! Companion > > Toolbar. > > Now with Pop-Up Blocker. Get it for free! > > > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM > > > -------------------------------- ~-> > > > > > > . > > > > > > Yahoo! Groups Links > > > > > > msp430-unsubscribe@msp4... > > > > > > > > > > > > > > > > > __________________________________ >
Reply by ●December 15, 20042004-12-15
Sir
How to read ADC samples
----- Original Message -----
From: "Wolfgang Reich" <reich_wolfgang@reic...>
To: <msp430@msp4...>
Sent: Wednesday, December 15, 2004 06:19 PM
Subject: [msp430] Re: DC-DC converter design
>
>
> --- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote:
> > However, I don't understand how you can obtain a
> > regulated 3V with an input voltage between 2.5V & 4.2V
> > (Li-Ion battery).
>
> Linear Technology has some very nice synchronous buck/boost
> converters, e.g. LTC3440.
> http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116
>
>
> > --- onestone <onestone@b...> wrote:
> >
> > >
> > > On nearly all my designs I use a regulator of some
> > > kind, mainly to get
> > > the most out of a battery while retaining the same
> > > supply voltage
> > > enabling high speed operation and flash writing. The
> > > MAX1724 has an
> > > extremely low quiescent current at only 1.5uA, but
> > > is limited to 150mA.
> > > IT takes input of 0.8 to 5.5V and comes in a range
> > > of fixed voltages.
> > > For high current I use the MAX1674. It's quiescent
> > > current is 16uA, but
> > > it can output 1A from an input of 0.7V to Vout. It
> > > works with slight
> > > overvoltage.
> > >
> > > I get my batteries from Taiwan. 3.3Ah costs me US$7
> > > in low volume US$5
> > > in 100 off. I get mine through a friend in Asia. The
> > > company is called
> > > HEcell. The free trade magazine 'ELECTRONIC
> > > COMPONENTS ASIA' is an
> > > absolute gold mine for stuff like this.
> > >
> > > Al
> > >
> > > Frederic Beaulieu wrote:
> > >
> > > >>From: "onestone" <onestone@b...>
> > > >>
> > > >>This is not a Li-poly or Li-ion. These output 3.6V
> > > >
> > > > and >are capable of
> > > >
> > > >>very high discharge currents at low temperatures.
> > > I
> > > >>regularly use these in systems drawing up to 1A.
> > > >
> > > >
> > > > Which one exactly do you use? Are they expensive?
> > > > How do you regularize it for a 3V output voltage?
> > > I
> > > > can see for 5V output (switcher) but I'm not sure
> > > for
> > > > 3V.
> > > >
> > > >
> > > >>170mA is very high for many >battery
> > > >>technologies.
> > > >>
> > > >>Al
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________
> > > >
> > > >
> > > >
> > > >
> > > > .
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > ------------------------ Yahoo! Groups Sponsor
> > > --------------------~-->
> > > Make a clean sweep of pop-up ads. Yahoo! Companion
> > > Toolbar.
> > > Now with Pop-Up Blocker. Get it for free!
> > >
> > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM
> > >
> > --------------------------------
> ~->
> > >
> > >
> > > .
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > > msp430-unsubscribe@msp4...
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > __________________________________
> >
>
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
______________________________________
Scanned and protected by Email scanner
Reply by ●December 15, 20042004-12-15
I designed an equipment powered with 2.5V-4.8V using two LTC3440 (+5V- step-up and +3.3V- step-up/down). The power consumption in each one of them is around 100mA and the circuit works fine. Paulo. -----Mensagem original----- De: Wolfgang Reich [mailto:reich_wolfgang@reic...] Enviada em: quarta-feira, 15 de dezembro de 2004 10:50 Para: msp430@msp4... Assunto: [msp430] Re: DC-DC converter design --- In msp430@msp4..., Frederic Beaulieu <Frb78@y...> wrote: > However, I don't understand how you can obtain a > regulated 3V with an input voltage between 2.5V & 4.2V > (Li-Ion battery). Linear Technology has some very nice synchronous buck/boost converters, e.g. LTC3440. http://www.linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1042,C1116 > --- onestone <onestone@b...> wrote: > > > > > On nearly all my designs I use a regulator of some > > kind, mainly to get > > the most out of a battery while retaining the same > > supply voltage > > enabling high speed operation and flash writing. The > > MAX1724 has an > > extremely low quiescent current at only 1.5uA, but > > is limited to 150mA. > > IT takes input of 0.8 to 5.5V and comes in a range > > of fixed voltages. > > For high current I use the MAX1674. It's quiescent > > current is 16uA, but > > it can output 1A from an input of 0.7V to Vout. It > > works with slight > > overvoltage. > > > > I get my batteries from Taiwan. 3.3Ah costs me US$7 > > in low volume US$5 > > in 100 off. I get mine through a friend in Asia. The > > company is called > > HEcell. The free trade magazine 'ELECTRONIC > > COMPONENTS ASIA' is an > > absolute gold mine for stuff like this. > > > > Al > > > > Frederic Beaulieu wrote: > > > > >>From: "onestone" <onestone@b...> > > >> > > >>This is not a Li-poly or Li-ion. These output 3.6V > > > > > > and >are capable of > > > > > >>very high discharge currents at low temperatures. > > I > > >>regularly use these in systems drawing up to 1A. > > > > > > > > > Which one exactly do you use? Are they expensive? > > > How do you regularize it for a 3V output voltage? > > I > > > can see for 5V output (switcher) but I'm not sure > > for > > > 3V. > > > > > > > > >>170mA is very high for many >battery > > >>technologies. > > >> > > >>Al > > > > > > > > > > > > > > > > > > > > > __________________________________ > > > > > > > > > > > > > > > . > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > --------------------~--> > > Make a clean sweep of pop-up ads. Yahoo! Companion > > Toolbar. > > Now with Pop-Up Blocker. Get it for free! > > > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/CFFolB/TM > > > -------------------------------- ~-> > > > > > > . > > > > > > Yahoo! Groups Links > > > > > > msp430-unsubscribe@msp4... > > > > > > > > > > > > > > > > > __________________________________ > . Yahoo! Groups Links --- O e-mail recebido estlivre de vus. Delfos Tecnologia Eletrica Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.811 / Virus Database: 552 - Release Date: 13/12/2004 --- O e-mail enviado estlivre de vus. Delfos Tecnologia Eletrica Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.811 / Virus Database: 552 - Release Date: 13/12/2004
