No, it's using the MC34063A switching regulator. I'm an EE--so was thinking linear as well, but it's not.
On Thu, Jan 15, 2015 at 9:21 PM, Ytai Ben-Tsvi <[email protected]> wrote: > Paul, you are probably using a linear regulator, which is inefficient by > design (it reduces the voltage by burning the difference as heat. > Andries, sounds to me like your external 5V regulator is unstable. > > On Thu, Jan 15, 2015 at 6:03 AM, Paul McMahon <[email protected]> > wrote: > >> Yes, I was surprised I blew it when using a bench supply, which should be >> very well behaved (it's a good supply). >> I should add that the cigarette adapter I use is sadly inefficient, even >> when dropping from 12 to 7-8V. The regulator on that board gets so hot you >> can't even really touch it for more than a half second. I measured it with >> an IR thermometer at around 70C. I guess that's what you get for $1. >> Still, it's fine by me. >> >> >> On Thu, Jan 15, 2015 at 8:57 AM, Andries Kruger <[email protected]> >> wrote: >> >>> That sounds like a very simple suggestion Paul. I am actually going to >>> power my IOIO from a 24V supply, so I have an Orion 24/12-5A DC-DC >>> converter to take me down from 24 to 12. The converter is supposed to >>> handle transients very well, especially transients from vehicles. My VREG >>> blew when I hooked it up to the DC-DC converter running from a 24V bench. >>> So I was really surprised when the VREG didn't survive as I expected a very >>> clean output. >>> >>> On Thursday, 15 January 2015 14:10:25 UTC+2, Paul McMahon wrote: >>>> >>>> I, too, fried a Vreg a while ago, and have a 12V application. I was >>>> using a bench supply at the time. >>>> I decided to use a cigarette lighter USB charger circuit board in front >>>> of the ioio vin terminal, $1, and no issues since (at least 100 cycles). >>>> The board is very small, too. >>>> I made a slight tweak to the charger board, though not really >>>> necessary: I adjusted the voltage setpoint resistor to get an output >>>> voltage of 7-8 volts. To give some headroom over the phone's charging >>>> circuit. >>> >>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "ioio-users" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/ioio-users/FHjcCbAM2Ig/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/ioio-users. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "ioio-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/ioio-users. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to a topic in the > Google Groups "ioio-users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/ioio-users/FHjcCbAM2Ig/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
