L6208PD datasheet(24/35 Pages) STMICROELECTRONICS

24 / 35 page

Application information

L6208

24/35

DocID7514 Rev 2

Application information

A typical bipolar stepper motor driver application using the L6208 device 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 L6208 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 shutdown time when an

overcurrent is detected (see Section 7.5: Non-dissipative 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 Table 4: Pin description on page 6). It is recommended to keep power

ground and signal ground separated on the PCB.

Table 7. Component values for typical application

Component

Value

Component

Value

100 µF

1N4148

100 nF

1N4148

1 nF

39 K



1 nF

39 K



CBOOT

220 nF

REN

100 K



10 nF

100



CEN

5.6 nF

RSENSEA

0.3



CREF

68 nF

RSENSEB

0.3



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