L6235PD datasheet(25/35 Pages) STMICROELECTRONICS

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L6235

Application information

A typical application using the L6235 device is shown in Figure 23. Typical component

values for the application are shown in Table 8. A high quality ceramic capacitor (C2) in the

range of 100 nF to 200 nF should be placed between the power pins VSA and VSB and

ground near the L6235 device to improve the high frequency filtering on the power supply

and reduce high frequency transients generated by the switching. The capacitor (CEN)

connected from the EN input to ground sets the shutdown time when an overcurrent is

detected (see Section 10: Non-dissipative overcurrent detection and protection). The two

current sensing inputs (SENSEA and SENSEB) should be connected to the sensing resistor

RSENSE with a trace length as short as possible in the layout. The sense resistor should be

non-inductive resistor 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 Table 4: Pin description on page 6). It is recommended to keep power ground

and signal ground separated on the PCB.

Table 8. Component values for typical application

Component

Value

100 µF

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

5.6 K



1.8 K



4.7 K



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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