erdabyz
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A month or two ago I posted here that i was working on some switching laser diode driver models. I had two models already designed, one capable of 150mA at 5.5V,boost only, and the other capable of up to 1.1A at 5.35V (i know, the voltage is not high enough for 8X's), with 3 user selectable currents that can be changed when running (with push buttons for example) and buck-boost capable (can drive for example a 2.2V diode from a li-ion cell, or a blu-ray too), but it will require diode isolation if using case negative diodes, as it won't be common grounded.
I have another model on its way to be designed, well, it was designed but I have to redesign it to be more efficient. That one will be capable of about 7V at 400mA or more.
Well, yesterday I received my hot air station and I had all the parts to make the 150mA driver so... that's what I did. It works perfectly. It's only designed to drive PHR diodes, and it's a "cheap" driver. I needed it to make a keychain blu-ray laser that would operate with a single AAA li-ion cell (10440) and i can't find them protected, so I added a protection IC that disables the driver if the battery voltage falls below 3.07 volts. It fits into an aixiz or sure module and it doesn't get hot. As it is a low current driver, the current sensing method is just a 12 ohm resistor that drops the feedback voltage at 115mA. That way we loose some efficiency but it doesn't matter for this design.
EDIT: that means that the driver you see in the pictures is set to 115mA, but it can be set to more or less current changing the resistor value.
I only have parts to make 2 more like this, but if you like it and want to buy it i could order some parts and start making them. The price would be somewhere around $10 + shipping. If I remove the battery protector and add a schottky diode, it can drive a PHR at 150mA from a 1.5V AAA cell. So that choice would also be available, and it would be about $1.5 cheaper. (it would still operate with a li-ion cell, but you'll lose the protection feature)
Here are some pictures of the driver already soldered to a PHR and pressed into the host's head. I have yet to solder the spring and the case contact.
And this is how this particular laser will look like once completed (i still haven't received my 10440's
)
It is a keychain build, a very easy one as it requires no machining. I just wrapped some aluminium foil impregnated with thermal compound around the laser module head to fill the 0,2mm existant gap and press-fitted it into the host's head. It won't fall
The other driver model will be built when i receive the neccesary coils (probably this week)
I have another model on its way to be designed, well, it was designed but I have to redesign it to be more efficient. That one will be capable of about 7V at 400mA or more.
Well, yesterday I received my hot air station and I had all the parts to make the 150mA driver so... that's what I did. It works perfectly. It's only designed to drive PHR diodes, and it's a "cheap" driver. I needed it to make a keychain blu-ray laser that would operate with a single AAA li-ion cell (10440) and i can't find them protected, so I added a protection IC that disables the driver if the battery voltage falls below 3.07 volts. It fits into an aixiz or sure module and it doesn't get hot. As it is a low current driver, the current sensing method is just a 12 ohm resistor that drops the feedback voltage at 115mA. That way we loose some efficiency but it doesn't matter for this design.
EDIT: that means that the driver you see in the pictures is set to 115mA, but it can be set to more or less current changing the resistor value.
I only have parts to make 2 more like this, but if you like it and want to buy it i could order some parts and start making them. The price would be somewhere around $10 + shipping. If I remove the battery protector and add a schottky diode, it can drive a PHR at 150mA from a 1.5V AAA cell. So that choice would also be available, and it would be about $1.5 cheaper. (it would still operate with a li-ion cell, but you'll lose the protection feature)
Here are some pictures of the driver already soldered to a PHR and pressed into the host's head. I have yet to solder the spring and the case contact.
And this is how this particular laser will look like once completed (i still haven't received my 10440's
)
It is a keychain build, a very easy one as it requires no machining. I just wrapped some aluminium foil impregnated with thermal compound around the laser module head to fill the 0,2mm existant gap and press-fitted it into the host's head. It won't fall
The other driver model will be built when i receive the neccesary coils (probably this week)
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