Features

Able to drive two winding of the bipolar step motor

engine

The output current of each winding is as high as 500mA

Wide voltage voltage Scope 4.5V to 10V

Half -step, full step and micro -step mode

Built -in protective diode

Internal PWM current control

Low output saturation voltage [ 123]

is a bipolar single film Integrated circuit control and two winding circuit bipolar step motors or two -way control two DC electrical motors. The L6219R with a small number of external components forms a complete control and driving LS-TTL or microprocessor control circuit Stepping motor system. The power grade is a dual full bridge that can withstand 10V voltage, including four diodes used for current recreation. Provide cross -conducting protection to avoid the current direction of cross -conduction while switching. The internal pulse width modulation (PWM) controls output current is 500 mAh peak starting current as high as 1A. The current range is widely allowed to control two logical input and an external voltage reference from 500mA (each bridge). The phase input of each bridge determines the direction of the load current. The heat protection circuit disable output If the chip temperature exceeds the safety operation limit.

Note: ESD guarantee for ground, VS, VSS, OUT 1A, and out 2A Features (TJ) 25 ° C, vs 4.5V, VSS 4.75V to 5.25V, VREF 2V; unless there are other regulations), see Figure 5.

(TJ) 25 ° C, vs 4.5V, vss 4.75V to 5.25V, vREF 2V ; Unless there are other regulations) See Figure 5.

This circuit is used to drive two winding of the bipolar step motor. Peak current control generates rules and regulations through the switch mode. It is a choice of three different current levels. Two logical input I01-I11 is used for winding 1, i02-I12 is used for winding 2. The current can also be completely closed

Enter logic (i0 and i1)

Use these input to select the current level in the motor winding group. (See Figure 4) If any logic input keeps open, the circuit will process it a high level input.

The input determines the direction of the current in the winding, depending on the motor connection. The signal is anti-noise through Schmidt trigger and delayed to ensure that in-stage-transfer. The high phase input level causes the motor current from A output to exit through the winding to B exports

current sensor

This part includes a current fluid resistance (RS), a low -pass filter (RC, CC CC, CC ) And three comparators. Just activate only one comparator at a time. It is selected by the input logic activation based on signal IO and i1. When does the motor current flow over the sensor of the sensor increase, the voltage on the RS is higher than the reference voltage of the other comparator input terminal, that is, the comparator becomes higher and the trigger pulse generator. The maximum peak current IMAX can be defined as:

Single pulse occurs occur.

The pulse generator is a single -stable output single -stable output from the positive edge of the comparator's positive edge. It is very high during the pulse time TOFF, which has a time component RT and CT. TOFF 1.1 · RTCT single pulse cutting the power supply of the motor winding, which leads to a reduced current Tiff during the winding. If a new trigger signal appears during the TOFF process, it is ignored.

Output level

The output level contains four Darlingon transistors (source drives), four saturated transistors (receiver drives) and eight diode, which are connected to two H bridges.

VS, VSS, VREF

The circuit will bear the order of any connection or disconnection of the voltage of the power supply VS and VSS. Normally assume the DV/DT value. If VS is established, VREF is best to track VSS

are not designed to run continuously at the maximum current. As a circuit drive a constant current through the motor, its temperature may increase whether it is low or high -speed operation. In addition, some step motors have such high -speed rail damage, which is not suitable for switch mode current adjustment. Unused inputs should be connected to the appropriate voltage level to obtain the highest noise immunity. Because the circuit is adjusted by switching current, it may occur in certain applications that may occur in certain applications. A good measure may be that the circuit with a 100NF capacitor is located near the package between the power cord and the ground. The ground line between RS and GND should be as short as possible. The typical application circuit is shown in Figure 5. Note that CT must be nPO type or similar type.In order to detect the winding current, it is recommended to connect the metal membrane resistor (RS)