L298N motor drive circuit (original)

Single chip microcomputer STM32L151CCU6

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

inductance

SMD aluminum electrolytic capacitor

Working principle analysis:

In the stepping motor drive module, TLP521 with optocoupler isolation and strong anti-interference ability is adopted as the isolated current protection chip, wherein the 17th leg of L297 controls the forward and reverse of the stepping motor by giving high and low level, and 18 feet For the stepping clock input terminal, control the time increment of each step, the half-step or the whole step of the 19-step stepping motor is selected, and the 10-pin is the enabling control terminal to control the start and stop of the motor, and the inner contains 4 Channel logic drive circuit, high voltage, high current double H bridge driver L298 to control the motor's forward and reverse; use L298 to realize motor drive and its forward and reverse, and use diode for freewheel protection, use 7805 to provide 5v power supply to controller And l298 chip power supply, this circuit is prone to heat in the case of long working hours, resulting in circuit instability.

The main features are:

Key chip: L298N double H bridge DC / stepper motor driver chip

L298N chip working voltage: DC 4.5~5.5V.
Motor drive power supply voltage DC 5--35V.
LED indicator is indicated when the power input is normal.
PCB size: 4.4*5.0cm
The maximum output current is 2A (instantaneous peak current 3A) and the maximum output power is 25W.
When the output is normal, the motor is running with an LED indicator.
With diode freewheel protection.
Two DC motors or one two-phase 4-wire (or 6-wire) stepper motor can be controlled separately.
A DC motor up to 3A can be controlled by a parallel connection method.
The motor can be reversed.