Ir2110 Mosfet Driver Circuit Diagram
To control speed and rotation direction of the DC motor we need some type of the motor driver, one of the most popular schematic is. For the low current and voltages we can use some integral solution like and so on. But if we need more power and reliability we have to build some custom H-bridge using mosfet transistors. This type of the transistors requires careful and proper driving itself. One of the most popular integral solution for driving mosfets is from Infineon.In this article we will discuss how to use this IC to build powerful DC motor driver.IR2110 is a high voltage (up to 500V) chip which is suitable to drive various types of the mosfet and IGBT.
Mosfet Driver Circuit Diagram
This device contains both low-side and high-side half-bridge driver.You can find pins description and other parameters in.Here is a typical schematicThis is a half-bridge driver, which means that LOAD pin can be connected to LOAD SUPPLY or to AGND, depending on state of the input pins ENABLE HI and ENABLE LO. This signals can be static voltage of the logic levels (3.3 to 5 volts) or some pulse signals like PWM.Controlling of the Q2 mosfet is very simple and doesn’t required extra schematics.With Q1 all things is little bit more complicated since SOURCE pin of this transistor is floating without direct connection to the power supply negative line.To be able to enable this transistor we need to create “virtual” zero point and additional power is required.This problem can be solved using bootstrap circuitry.You can see diode D5 and two capacitors C1 and C2. When the low-side is active (Q2 is opened) both capacitors is charging through the diode from the IR2110 power supply (typically 12V). Then when the high-side is became active this capacitors is using to charge Q1 gate and open this transistor.Value of C1 is depends on switching frequency and duty cycle. Typically this value is in range 4.7 – 22 microfarads.Of course there is a formula which can be used to calculate proper value. Please read if you want to know more about floating and bootstraps circuits.But also you can select proper capacitor value experimentally. Proper value is garantie that capacitor can discharge quick enough to close transistor and charge quick enough to reach required voltage value.