![]() ![]() According to these logics motor will be driven by the two transistors which are in ON state in one direction. U1:D will be 1 accordingly.Therefore, Q1 transistor will be OFF state and Q2 transistor will be ON state. Also, IN= 0, namely U1:C And gate will have output Logic 0. Lets say ENABLE =0 and IN1 = 1 (5V) First And gate output will be = 1, Second one will lbe = 0 and Q4( in the schematic) Transistor will be ON state, Q3 will be ON state. NOTE THAT: By using PWM into ENABLE we will be able to control speed of the motor. ![]() 3 PGA460 and DRV8870 Full-Bridge Solution 3.1 Description For the simplest full-bridge driver solution, TIs DRV8870 motor driver is used to integrate all four MOSFETs of the full-bridge. That is why any Low input of the and gate will give us low output. pins of the PGA460 are repurposed to exclusively function as gate drivers. That means the current thru R1 is 9.6 mA. With 3.3 V on the base, there is about 2.6 V across R1. ![]() Instead of operating Q1 as a switch, it is a controlled current sink. The MOSFET transistor in this circuit is the IRF540 MOSFET transistor. Here is a better circuit using your basic concept: This circuit is for when the power supply is at least a few volts more than the desired FET gate swing. The 555 timer will generate the pulse width modulation signal at a specific duty cycle and switch the MOSFET transistor Q1. In this schematic, ENABLE pin is used for to enable our driver, whatever the other inputs are, if ENABLE = Logic LOW(0v) then motor will not be driven by the circuit due to AND Gate. Circuit analysis Figure 1 shows the schematic diagram of the H-bridge DC motor driver. the H-bridge driver IC is the chip between the Arduino and the MOSFET outputs. By the help of the 3 input pins (IN1, IN2, ENABLE) we will be able to drive our motor in both directions. Well, we have actually simple schematic here. ![]()
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