L6227Q datasheet(19/27 Pages) STMICROELECTRONICS

19 / 27 page

L6227Q

Application information

19/27

Application information

A typical application using L6227Q is shown in

Figure 18. Typical component values for the

application are shown in

Table 8. 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

L6227Q to improve the high frequency filtering on the power supply and reduce high

frequency transients generated by the switching. The capacitors connected from the ENA

and ENB inputs to ground set the shut down time for the bridge A and bridge B respectively

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 ENA and ENB) 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 8.

Component values for typical application

Component

Value

100

µF

100 nF

1 nF

CBOOT

220 nF

10 nF

CENA

5.6 nF

CENB

5.6 nF

CREFA

68 nF

CREFB

68 nF

1N4148

39 k

Ω

39 k

Ω

RENA

100 k

Ω

RENB

100 k

Ω

RSENSEA

0.6

Ω

RSENSEB

0.6

Ω

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