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E-L6258EP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
L6258EP Application information
25/32
Figure 10. Typical application circuit
4.2 Motor selection
Some stepper motor have such high core losses that they are not suitable for switch mode
current regulation. Furthermore, some stepper motors are not designed for continuous
operating at maximum current. Since the circuit can drive a constant current through the
motor, its temperature might exceed, both at low and high speed operation.
4.3 Unused inputs
Unused inputs should be connected to the proper voltage levels in order to get the highest
noise immunity.
STEPPER
MOTOR
M
12mH 10Ω
0.33
0.33
21
20
14
35
34
5
OUT2B
SENSE2
OUT2A
SENSE1
OUT1B
OUT1APH1
2
I0_1
4
I1_1
3
I2_1
32
I3_1
33
PH2
17
I0_2
15
I1_2
16
I2_2
23
I3_2
22
DISABLE
6
10nF
100nF
1nF
TRI_CAP
7
VS
13,31
VBOOT
12
VCP2
11
VCP1
10
9
GND
1,36
18,19
PWR_GND
VS
27
SIG_GND
28
D97IN626EP
VREF1
26
VREF2
29
EA_IN1
30
EA_OUT1
820pF
1M
25
EA_IN2
24
EA_OUT2
820pF
1M
VREF
8
V
DD
V
DD
(5V)
L6258EP
PWSSO36
PACKAGE
R2 1MR1 1M
Application information L6258EP
26/32
4.4 Notes on PCB design
We recommend to observe the following layout rules to avoid application problems with
ground and anomalous recirculation current.
The by-pass capacitors for the power and logic supply must be kept as near as possible to
the IC.
It's important to separate on the PCB board the logic and power grounds and the internal
charge pump circuit ground avoiding that ground traces of the logic signals cross the ground
traces of the power signals.
Because the IC uses the board as a heat sink, the dissipating copper area must be sized in
accordance with the required value of R
thj-amb
.
L6258EP Operation mode time diagrams
27/32
5 Operation mode time diagrams
Figure 11. Full step operation mode timing diagram
(Phase - DAC input and motor current)
Ph2
FULL Step Vector
023103210
Position
DAC 2
Inputs
0
Motor drive
Current 2
0
Motor drive
Current 1
I3_2
I2_2
I1_2
I3_1
0
0
5V
0
5V
0
5V
0
5V
0
5V
0
5V
0
5V
0
5V
0
5V
DAC 1
Inputs
Phase
2
Phase
1
I0_2
I2_1
I1_1
I0_1
0
32
1
Ph1
Ph2
Ph1
D97IN629A
95.2%
19.1%
95.2%
19.1%
I3 I2 I1 I0
Current
level% of I
MAX
0000 100
0001 98.4
0010 95.2
0011 92.1
0100 88.9
0101 82.5
0110 77.8
0111 71.4
1000 63.5
1001 55.6
1010 47.6
1011 38.1
1100 28.6
1101 19.1
1110 9.5
1 1 1 1 No Current
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

E-L6258EP

Mfr. #:
Buy E-L6258EP
Manufacturer:
STMicroelectronics
Description:
Motor / Motion / Ignition Controllers & Drivers PWM CTRL Motor DRV 1.3A 12V to 40V BCD
Lifecycle:
New from this manufacturer.
Delivery:
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