L6235Q datasheet(23/33 Pages) STMICROELECTRONICS

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L6235Q

Application information

Doc ID 018997 Rev 2

23/33

Application information

A typical application using L6235Q is shown in Figure 23. Typical component values for the

application are shown in Table 7. A high quality ceramic capacitor (C2) in the range of 100 to

200 nF should be placed between the power pins (VSA and VSB) and ground near the

L6235Q to improve the high frequency filtering on the power supply and reduce high

frequency transients generated by the switching. The capacitors (CEN) connected from the

EN input to ground sets the shutdown time when an overcurrent is detected (see

Section 4.7). The two current sensing inputs (SENSEA and SENSEB) should be connected

to the sensing resistors RSENSE 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 are best connected to 5 V (high logic

level) or GND (low logic level) (see Section 2). It is recommended to keep power ground and

signal ground separated on the PCB.

Table 7.

Component values for typical application

Component

Value

100 uF

100 nF

220 nF

CBOOT

220 nF

COFF

1 nF

CPUL

10 nF

CREF1

33 nF

CREF2

100 nF

CEN

5.6 nF

10 nF

1N4148

5K6

1K8

4K7

1 M

RDD

1 K

REN

100 k

100

RSENSE

0.3

ROFF

33 k

RPUL

47 k

RH1, RH2, RH3

10 k

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