Power Supply 3.3V DC 4.55A Ideal for Laser Diode

New 3.3V DC 4.55A Power Supply

Brand new 3.3V DC 4.55A power supply.  This runs on 100-240V AC and for shipments to the US, includes a standard IEC power cord.  Overseas buyers will need to provide their own AC power cord.

This is ideal for powering many laser diodes up to 4 watts when used with an appropriate current limiting resistor in series with the laser diode.  You can use ohm's law to calculate the value of the current limiting resistor as follows:

R = (3.3-Vd)/Id

Where Vd is the diode voltage (typically 1.8-2.2V) and Id is the diode current.

For example, to get a diode current of 2 amps, the current limiting resistor should be (3.3-2.0)/2.0 = 0.65 ohms.  The power dissipated as heat in the resistor can be calculated as follows:

P = (3.3-Vd) * Id

In the previous example, the power is 1.3 * 2.0 = 2.6 watts so a 3 watt or larger power resistor must be used.

The advantage of using a 3.3V power supply instead of a more common 5V supply is that the power lost in the current limiting resistor is much lower.  For example, in the case of a 5V power supply set up for the same 2 amp diode current:

R = (5.0-2.0)/2.0 = 1.5 ohms

P = (5.0-2.0) * 2.0 = 6 watts (which requires a 10W or larger power resistor that will get quite hot)

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About Junktronix

"One man's junk is another man's treasure"

Junktronix has been buying and selling Silicon Valley Surplus electronics, photonics, optics, laser equipment, test gear, mechanical and robotics components and more since 1996. Unlike a lot of surplus dealers, we try to understand what we're selling so that we can test it and offer technical support. Check our feedback and you'll see that we sell high quality "junk" and take good care of our customers.