DATASHEET and Circuit Diagram

Since bipolar stepper motor gives more torque and costs less than an equivalent unipolar motor, the use of monolithic  bridge drivers become very useful for simplifying bipolar motors. The herein circuit shows basic configuration for bipolar stepper motor driving which can be applied using either an L293 or an L298N.

In this basic bipolar stepper motor driver circuit diagram, it is assumed that a suitable translator is connected to the four channel inputs. This circuit shows that a single device can be used to drive a two phase bipolar stepper motor.

The herein article contains information related on the method of closed loop control with a sensor and an actuator and how to apply the method to build a rudimentary On/Off heater controller (On/Off Temperature Control). The semiconductor components used to build this control circuit are thermistor, Zener diode, LED, relay, op-amp, and bipolar transistor.

Sections describe in this article are such essential elements of the control circuit, basic thermistor sensing circuit (using an op-amp without feedback as a comparator), thermistor sensing circuit using 2N222 transistor with 4 and output driver stage added, controlling a real actuator with a relay, and then finalising the circuit and improving the stability with Schmitt Trigger.

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Stepper motor is a brushless, synchronous electric motor that can divide a full rotation into a large number of steps (wikipedia.org). The following article provides all information about Stepper Motors Driver Design Application and Consideration including common problems and solutions.

What you will find in the depth of the article are sections such Motor Selection (Unipolar vs Bipolar), Drive Topology Selection, Driving a Unipolar Motor with the L298N or L6202/6203, Selecting Enable or Phase Chopping, Chopper Stability and Audio Noise, Driving a unipolar wound motor with a bipolar drive, Spikes on the sense resistor, and application circuit of L6506, L297, PBL3717A ICs.

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The diagram below schemes Two Phase Bipolar Stepper Motor Driver using PBL3717A, a monolithic IC which drives one phase of a bipolar stepper motor with chopper control of the phase current, according to the datasheet.

The circuit diagram shows two PBL3717A IC that control and drive two bipolar stepper motor.

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The schematic shows you with the Simplified Half-Bridge Output Inverter Circuit. The circuit diagram is called to be Full-Bridge simplification since the number of equivalent Insulated-Gate Bipolar Transistor (IGBTs) is now a half even the number of diodes in the output rectifier is doubled.

When one of IGBTs is in ON, the other is OFF. During the positive half wave, X1 is ON and X2 is OFF so that DA and DB work as output rectifier while DC & DD are OFF and vice versa.

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The schematic herein appears a 5A H-Bridge Module for the working of one Bipolar DC motor.

H-Bridge Module consists of one set header (J2) and one set connector terminal (J1). The J2 interface header functions as the interface input to the digital input-output and analog output from the H-Bridge module. And here are the J2 pinout description of H-Bridge module interface:

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