L6228Q datasheet(23/32 Pages) STMICROELECTRONICS

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L6228Q

Application information

Doc ID 14321 Rev 4

23/32

Application information

A typical bipolar stepper motor driver application using L6228Q is shown in Figure 25.

Typical component values for the application are shown in Table 7. A high quality ceramic

capacitor in the range of 100 to 200 nF should be placed between the power pins (VSA and

VSB) and ground near the L6228Q to improve the high frequency filtering on the power

supply and reduce high frequency transients generated by the switching. The capacitor

connected from the EN input to ground sets the shut down time when an over current is

detected (see overcurrent protection). The two current sensing inputs (SENSEA and

SENSEB) should be connected to the sensing resistors with a trace length as short as

possible in the layout. The sense resistors should be non-inductive resistors to minimize the

dI/dt transients across the resistor. To increase noise immunity, unused logic pins (except

EN) are best connected to 5 V (high logic level) or GND (low logic level) (see pin

description). It is recommended to keep power ground and signal ground separated on PCB.

Table 7.

Component values for typical application

Component

Value

100 µF

100 nF

1 nF

CBOOT

220 nF

10 nF

CEN

5.6 nF

CREF

68 nF

1N4148

39 k

REN

100 k

RSENSEA

0.6

RSENSEB

0.6

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