Ordering a custom PCB is mandatory. What it's of is up to us. I knew the basics of boost converters, so didn't expect to struggle as much as I am. But I'm too far into this circuit as a whole (the boost converter is the final piece of it) to stop now.Hi,
Do one design first. Start the other after the first is finished.
You talk about Mosfet selection. Why not using a boost controller IC with internal Mosfet?
..or use ready to buy boost modules?
Klaus
Yeah, today is day 4 of me scouring the internet trying to figure this out. I feel it's mostly the mosfet tripping me up. That, and figuring out the switching frequency of the circuit. If I use a Schottky Diode, I feel like that component's switching frequency would be fast enough that the transistor will end up being what will limit the switching frequency.there are tons of chips with app notes to get you started here - try reading widely ....
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5W & 12W respectively, easy ... get stuck into the internet ....
It is for an extracurricular through school.Hi,
Sadly it seems I was not clear with my question... why not using an IC.
Is it a school project or just for simulation or to build a real circuit?
Does it have to be designed with discrete parts only?
***
From the ripple specification it seems it´s not designed for supplying semiconductor electronics. May I ask what the voltage is used for?
***
You talk about "min current of 1A". So what´s the expectable "max load current"? (even if just for a millisecond)
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I just want you to focus on these questions. These are application requirements.
No solutions, no PCB, no knowledge...just first steps first
Klaus
Slow down. This is 5 steps ahead. Stay focussed on the requirement.I plan on using pick and place assembly through JLC PCBs, though, due to time (I have about 5-ish weeks left to have a working PCB in hand). This means I have to use their library. They have 3 pages of in-stock mosfets; they have only 3 IC switches. But if one of those will work for this application, I could definitely use it.
This rather sounds like:Specs don't outline a max load current; the 5V output circuit needs to charge an old smartphone. A 1A output current would probably be best for this. Although, since it's an old phone, we don't care about ruining its battery life - we just need to see that it does indeed charge it.
Yes, this is a portable charger being built. Sorry that I wasn't clear with that before.Hi,
Slow down. This is 5 steps ahead. Stay focussed on the requirement.
This rather sounds like:
* 1A is the max current, not the min current.
* you rather need a battery_charger than a power_supply_circuit.
Please confirm.
Klaus
The battery being charged belongs to an iPhone 4s. The original charging cable will be used in conjunction to the circuit I'm building (it will have USB output ports). The 5V and 1A parameters were determined because that's what the iPhone wall adapter's output is: 5V voltage, 1A current. 5W power. So the goal is to have this circuit's output be the same.Hi,
O.K. now we know you need a charger circuit.
Then it´s important to know the battery chemistry (type).
--> please tell us.
Information to this:
The problem is: You can´t just put a 12V voltage to a 12V battery and expect it to be charged properly.
Indeed you always need need to (be able to) charge with higher voltage than the nominal battery voltage.
12V lead acid batteries for example are charged with up to 14.4V.
Every battery type has it´s own reqiurements on charging voltage, charging current, timing temperature, voltage accuracy....
you may have a look at: www.batteryuniversity.com
Klaus
Hi,
This is so confusing...it´s really hard to find out the real requirements, because you are so busy with thinking currently unnecessary details.
So you don´t open the iPhone and connect your circuit directly to the battery?
Instead you just connect the iPhone to a supply instead of the iPhone´s wall wart.
--> please confirm.
Klaus
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