Datasheet

Application information L6229Q
22/28 Doc ID 15209 Rev 3
6 Application information
A typical application using L6229Q is shown in Figure 23. Typical component values for the
application are shown in Ta bl e 9. A high quality ceramic capacitor (C
2
) in the range of
100 nF to 200 nF should be placed between the power pins VS
A
and VS
B
and ground near
the L6229Q to improve the high frequency filtering on the power supply and reduce high
frequency transients generated by the switching. The capacitor (C
EN
) 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 (SENSE
A
and SENSE
B
) should be
connected to the sensing resistor R
SENSE
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 pin description). It is recommended to keep
power ground and signal ground separated on PCB.
Table 9. Component values for typical application
Component Value
C
1
100 µF
C
2
100 nF
C
3
220 nF
C
BOOT
220 nF
C
OFF
1 nF
C
PUL
10 nF
C
REF1
33 nF
C
REF2
100 nF
C
EN
5.6 nF
C
P
10 nF
D
1
1N4148
D
2
1N4148
R
1
5 k6Ω
R
2
1 k8Ω
R
3
4 k7Ω
R
4
1 MΩ
R
DD
1 kΩ
R
EN
100 kΩ
R
SENSE
0.6 Ω
R
OFF
33 kΩ
R
PUL
47 kΩ
R
H1
, R
H2
, R
H3
10 kΩ