Dec 21, 2011 Whether you need a MOSFET driver is determined by the MOSFET gate capacitance and the desired MOSFET output risetime. Generally you want to risetime to be no more than a few microseconds to minimize power dissipation. Oct 19, 2015 Transistor - MOSFET Constant Current Driver Like the single transistor current regulators, this type of LED driver is also a linear supply. Some additional advantages have to do mainly with the circuit's efficiency, which many times is not a balancing factor at all. Here is a typical circuit with two transistor, one being a MOSFET. A LED driver circuit is a circuit which can power on and light an LED We will simply use a transistor and a few resistors to bring about a circuit which, with minimal current, can produce enough current to drive and light an LED. The driver circuit is designed around three MOSFET for three different LED (RED, GREEN and BLUE). Arduino pin 5, 6 and 9 is connected to these three MOSFET gate as shown in circuit diagram. Three individual resistors each of 5.6K ground the gate pin of all these MOSFET.
Switching regulators, aka 'DC-to-DC', 'buck' or 'boost' converters, are the fancy way to power an LED. they do it all, but they are pricey. what is it they 'do' exactly? the switching regulator can either step-down ('buck') or step-up ('boost') the power supply input voltage to the exact voltage needed to power the LED's. unlike a resistor it constantly monitors the LED current and adapts to keep it constant. It does all this with 80-95% power efficiency, no matter how much the step-down or step-up is.
Pros:
- consistent LED performance for a wide range of LED's and power supply
- high efficiency, usually 80-90% for boost converters and 90-95% for buck converters
- can power LED's from both lower or higher voltage supplies (step-up or step-down)
- some units can adjust LED brightness
- packaged units designed for power-LED's are available & easy to use
Cons:
- complex and expensive: typically about $20 for a packaged unit.
- making your own requires several parts and electrical engineering skillz.
Pros:
- consistent LED performance for a wide range of LED's and power supply
- high efficiency, usually 80-90% for boost converters and 90-95% for buck converters
- can power LED's from both lower or higher voltage supplies (step-up or step-down)
- some units can adjust LED brightness
- packaged units designed for power-LED's are available & easy to use
Cons:
- complex and expensive: typically about $20 for a packaged unit.
- making your own requires several parts and electrical engineering skillz.
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