Buck Converter Mosfet Driver Circuit
High-power LEDs over 1W are now quite inexpensive. I'm sure many of you are incorporating LEDs as light sources in your projects. However I realize that the finding and configuring the power supply is still not as simple as it can be; commercially available LED drivers are convenient, but often overkill or not flexible. Even my own can be overkill at times. Some projects call for a bear minimum, simple driver. Poorman's Buck - Simple, Constant Current LED Driver So I created the 'Poorman's Buck' - simple switch-mode (buck) constant current LED driver that's built without a microcontroller or a specialized IC. All of the parts are easy to obtain, 'off-the-shelf', though-hole parts. Even though this driver is minimalistic, I added a current adjust function that doubles as a dimmer, and an input to control the output with PWM.
This makes the 'Poorman's Buck' perfect building block for Arduino or other microcontroller based LED projects - you can control many high-power LEDs from a microcontroller simply by sending PWM signal. With Arduino you can simply use 'AnalogWrite()' to control the brightness of high-power LEDs. Step 1: Features. • Inductor 'switch mode' (buck) converter for high energy efficiency. • Wide supply voltage range of 5 to 20V. Great with batteries as well as AC adaptors. • Cycle-by-cycle, true constant current circuit • Configurable output current up to 1A • Up to 15W maximum output power.
MOSFET Driver with Dual Outputs for Synchronous Buck Converters. MOSFETs in a synchronous buck converter. Side driver is developed by a bootstrap circuit. Gate Driver High-Side and Low-Side. Driver circuit. In a buck converter based on an N-channel. The N-channel MOSFET of a buck converter is a high-side. MOSFET Gate Drive Circuit Design Considerations for Integrated High Switching Frequency Buck Converter Yasser Nour. The driver circuit. MOSFET power losses and how they affect power-supply efficiency. (buck) DC/DC converter topology. Most of the power is in the MOSFET gate driver.
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(at supply voltage 20V with five 3W LEDs connected) • Current control potentiometer (trims the output current down to about 9%) • Current control can be used as a built-in dimmer • Output short-circuit protection • PWM control input - controllable via external microcontroller including Arduino. • Compact design - only 1 x 1.5 x 0.5 inches (excluding the pot shaft) Step 2: The Circuit.
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