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SLA7027 Scheda tecnica(PDF) 4 Page - Sanken electric

Il numero della parte SLA7027
Spiegazioni elettronici  2-Phase Stepper Motor Unipolar Driver ICs
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Produttore elettronici  SANKEN [Sanken electric]
Homepage  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SLA7027 Scheda tecnica(HTML) 4 Page - Sanken electric

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SLA7027MU/SLA7024M/SLA7026M
SLA7027MU/SLA7024M/SLA7026M
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
RS
C3
r2
r1
r6
r5
Vb(5V)
9,(10)
3,(14)
C3
r2
r1
r6
r5
Vb(5V)
9,(10)
3,(14)
rX
Tr
Power down
signal
sDetermining the Output Current
Fig. 1 shows the waveform of the output current (motor coil cur-
rent). The method of determining the peak value of the output
current (IO) based on this waveform is shown below.
(Parameters for determining the output current IO)
Vb: Reference supply voltage
r1,r2: Voltage-divider resistors for the reference supply voltage
RS: Current sense resistor
(1) Normal rotation mode
IO is determined as follows when current flows at the maximum
level during motor rotation. (See Fig.2.)
(2) Power down mode
The circuit in Fig.3 (rx and Tr) is added in order to decrease the
coil current. IO is then determined as follows.
Equation (2) can be modified to obtain equation to determine rx.
Fig. 4 and 5 show the graphs of equations (1) and (2) respec-
tively.
(NOTE)
Ringing noise is produced in the current sense resistor RS when
the MOSFET is switched ON and OFF by chopping. This noise
is also generated in feedback signals from RS which may there-
fore cause the comparator to malfunction. To prevent chopping
malfunctions, r5(r6) and C3(C4) are added to act as a noise filter.
Fig. 2 Normal mode
0
Phase A
Phase A
IO
Fig. 1 Waveform of coil current (Phase A excitation ON)
Fig. 3 Power down mode
4
3
2
1
0
01234
Current sense resistor RS (
Ω)
IO=
r1+r2
RS
r1=510
r2=100
rx=
Vb=5V
r2
·
Vb
Fig. 4 Output current IO vs. Current sense resistor RS
Fig. 5 Output current IOPD vs. Variable current sense resistor rx
2.0
1.5
1.0
0.5
00
200
400
600
800
Variable current sense resistor rX (
Ω)
1000
1200
RS =0.5
RS =0.8
RS =1
IOPD=
1+
RS
r1=510
r2=100
Vb=5V
1
·
Vb
r1(r2+rX)
r2 · rX
Application Notes
rX=
1
Vb
Rs
• IOPD
1
r1
−1
1
r2
However, when the values of these constants are increased,
the response from RS to the comparator becomes slow. Hence
the value of the output current IO is somewhat higher than the
calculated value.
................................................................ (1)
IO
r2
r1+r2
Vb
RS
......................................................... (2)
IOPD
1
r1(r2+rX)
r2
rX
Vb
RS
1+


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