L6228Q View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6228Q' PDF : 32 Pages View PDF
L6228Q
5
Application information
Application information
A typical bipolar stepper motor driver application using L6228Q is shown in Figure 25.
Typical component values for the application are shown in Table 7. A high quality ceramic
capacitor in the range from 100 to 200 nF should be placed between the power pins (VSA
and VSB) and ground near the L6228Q to improve the high frequency filtering on the power
supply and to reduce high frequency transients generated by the switching. The capacitor
connected from the EN input to ground sets the shut down time when an overcurrent 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
EN) are connected to 5 V (high logic level) or GND (low logic level) (see pin description). It is
recommended power ground and signal ground to be separated on PCB.
Table 7.
Component values for typical application
Component
C1
C2
CA
CB
CBOOT
CP
CEN
CREF
D1
D2
RA
RB
REN
RSENSEA
RSENSEB
Value
100 µF
100 nF
1 nF
1 nF
220 nF
10 nF
5.6 nF
68 nF
1N4148
1N4148
39 kΩ
39 kΩ
100 kΩ
0.6 Ω
0.6 Ω
Doc ID 14321 Rev 5
23/32
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