L6258E(2004) 데이터 시트보기 (PDF) - STMicroelectronics
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L6258E Datasheet PDF : 24 Pages
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L6258E
Figure 12. Typical Application Circuit.
10nF
100nF
VS
1nF
VCP1
10
VCP2
11
VBOOT
12
VS
TRI_CAP
13,31
7
PH1
I0_1
I1_1
I2_1
I3_1
PH2
I0_2
I1_2
I2_2
I3_2
DISABLE
2
4
3
32
33
17
15
16
23
22
6
29
EA_IN1
L6258E
SOP36
PACKAGE
30
25
EA_OUT1
EA_IN2
0.33
21
OUT2B
20
SENSE2
OUT2A
14
SENSE1
35
0.33
34
OUT1B
5
OUT1A
9
GND
1,36
18,19
8
27
PWR_GND
VDD
SIG_GND
28
26
24
EA_OUT2
VREF1
VREF2
STEPPER
M
MOTOR
12mH 10Ω
VDD(5V)
VREF
1M 820pF
R1 1M
1M 820pF
R2 1M
D97IN626E
5.2 Motor Selection
Some stepper motor have such high core losses that they are not suitable for switch mode current regulation. Fur-
thermore, 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.
5.3 Unused Inputs
Unused inputs should be connected to the proper voltage levels in order to get the highest noise immunity.
5.4 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 Rthj-amb.
18/24
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