I’d like to driver the high power LED KIMISS Led 3W:
(Annoyingly Amazon does not give the current required, I can only guess that 3W/3.4V means it is a bit less than 1A.)
This driver seems to fit the bill: CAT4101:
Am I right?
Tia
Those kind of "3W" LEDs are usually rated for 650-750mA. And will get hot at that current. Fix them to some heat sink if you drive them at max power.
So if the driver you were looking at is adjustable, should be ok. Otherwise some fixed max 700mA driver.
This would go up to 660mA and give you pwm control.
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Power (wattage) is calculated as Voltage x Current. 3W / 3.4V = 0.88 Amps.
The CAT4101 looks OK but make sure you understand what the datasheet says about power dissipation. With a linear device like this, the power dissipated by the driver is the the voltage dropped across the driver multiplied by the current. i.e. If you feed it 5V, that's (5 - 3.4) x 0.88 = 1.4W.
Switch-mode drivers/regulators/power supplies are MUCH more efficient. They run cooler but the circuitry is more complicated.
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But aren’t they bigger and more expensive?