Datasheet

Application information L6227
22/32 DocID9453 Rev 2
8 Application information
A typical application using the L6227 device is shown in Figure 18. Typical component
values for the application are shown in Table 3. A high quality ceramic capacitor in the range
of 100 to 200 nF should be placed between the power pins (VS
A
and VS
B
) and ground near
the L6227 to improve the high frequency filtering on the power supply and reduce high
frequency transients generated by the switching. The capacitors connected from the EN
A
and EN
B
inputs to ground set the shutdown time for the bridge A and bridge B respectively
when an overcurrent is detected (see Section 7.1: Non-dissipative overcurrent protection).
The two current sensing inputs (SENSE
A
and SENSE
B
) 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
A
and EN
B
) 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
C
1
100 F
C
2
100 nF
C
A
1 nF
C
B
1 nF
C
BOOT
220 nF
C
P
10 nF
C
ENA
5.6 nF
C
ENB
5.6 nF
C
REFA
68 nF
C
REFB
68 nF
D
1
1N4148
D
2
1N4148
R
A
39 K
R
B
39 K
R
ENA
100 K
R
ENB
100 K
R
P
100 
R
SENSEA
0.6 
R
SENSEB
0.6 