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Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
I'm planning to build some light led lights for my stunt kites. Those devices will have an on.board DC-dc with duty cicle controlled by a PIC micro 8pin 12series. The main problem that the pic needs 2V to start up and i want to use a single 1.5V battery. It is possible to use the pic at 1.5V @ 4Mhz?
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
I'm struck in some desing problems. In particular the switching freq is in the range of 200Khz for a 4mhz pic (1 us each instruction), this needs a larger inductor. THe voltage is too low to turn on the pic (only to maintain the ram) so i need to use a 3.6 v lithium, wich turns on the led even at 0% duty cicle (unless i use single switch buck boost). How to bootstrap the voltage for the pic?
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
I was saying that the boost topology simply passes the input voltage to the output though the diode so a led will see 3.6-0.7V = 2.9V at his leads and will turn on.. What did you understand?
I will solve it using a buckboost topology using the led as the load.
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Kite lights step-up
for my stunt kites. Those devices will have an on.board DC-dc with duty cicle controlled by a PIC micro 8pin 12series. The main problem that the pic needs 2V to start up and i want to use a single 1.5V battery. It is possible to use the pic at 1.5V @ 4Mhz?
