rhd
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- Dec 7, 2010
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Would someone be willing to help me clear up a bit of mental fuziness over some conceptual stuff? I'm having trouble understanding exactly the purpose of a driver when it somes to powering small laser diodes (like ones in a TO18 package)
From what I know of electronics, it is generally the case that a load (like a light bulb) needs to be supplied the correct voltage, but it will only draw the ammount of current it can utilize.
This seems to be the wrong logic to apply to laser diodes however. It seems that laser drivers mainly focus on limiting the current, and don't explicitly specify a voltage range. This leaves a couple (probably related) gaps in my understanding:
1) Why does current need to be regulated at all? Wouldn't a diode simply utilize whatever it could handle - like a light bulb?
2) If you had a 3.7v battery (like an 18650), and a diode that could run on 3.7v, why would ANYTHING need to be boosted/regulated about that setup. Why could one not be connected directly to the other.
If I've missed an obvious sticky, apologies. I know this is a very basic question.
From what I know of electronics, it is generally the case that a load (like a light bulb) needs to be supplied the correct voltage, but it will only draw the ammount of current it can utilize.
This seems to be the wrong logic to apply to laser diodes however. It seems that laser drivers mainly focus on limiting the current, and don't explicitly specify a voltage range. This leaves a couple (probably related) gaps in my understanding:
1) Why does current need to be regulated at all? Wouldn't a diode simply utilize whatever it could handle - like a light bulb?
2) If you had a 3.7v battery (like an 18650), and a diode that could run on 3.7v, why would ANYTHING need to be boosted/regulated about that setup. Why could one not be connected directly to the other.
If I've missed an obvious sticky, apologies. I know this is a very basic question.