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SI-7502 Datasheet(PDF) 4 Page - Sanken electric

Part No. SI-7502
Description  5-Phase Stepper Motor Driver ICs
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Manufacturer  SANKEN [Sanken electric]
Direct Link  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SI-7502 Datasheet(HTML) 4 Page - Sanken electric

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107
SI-7502 (SLA5011/SLA6503)
SI-7502 (SLA5011/SLA6503)
5-Phase Stepper Motor Driver ICs (Pentagon Connection)
Fig. A
Waveform of output current
IOH
O
IOH(max)=
0.212
×Vb−0.01
Rs
IOH(min)=
0.169
×Vb−0.03
Rs
IOH(max) (Vb=5V)
IOH(min)
(Vb=5V)
12
34
5
(
Ω)
(A)
3
2
1
0.5
0.2
Sense resistor Rs
VRSH (max)=
7.2
×RX
152.6+33.8
×RX
×Vb−0.01
VRSH (min)=
6.1
×RX
152.6+33.8
×RX
×Vb−0.03
V
RSH
(max)
(V
b=5V)
V
R
SH
(m
in
) (V
b=5V)
0.5
1
2
5
10
(K
Ω)
Variable current resistor Rx
20
0.2
1.0
0.8
0.6
0.4
(V)
IOM
IOM
IOM
IOM
2
×IOM
2
×IOM
VCC
4
×IOM
to SI-7502
Sense resistor Rs
Fig. B Output current vs. Current sense resistor
Fig. C Sense voltage vs. Variable current resistor
Fig. D Coil current flow at pentagonal driving
sDetermining the Output Current IO
(Control Current)
The main factors that determine the output current are current
sense resistor RS, supply voltage Vb, and variable current resis-
tor RX.
(1) Normal mode
To operate a motor at the maximum current level, set RX to
infinity (open).
From Fig. A, when the maximum current ripple is designated
as IOH, its value will be,
VRSH can be calculated as follows:
VRSH=0.19
×Vb−0.03 (center value)
From equations (1) and (2), the output current IOH can be
calculated as follows:
The relationship between IOH and RS is shown in Fig. B.
(2) Power down mode
When an external resistor RX is connected, VRSH changes as
shown in Fig. C even when RS is retained. Obtain a power
down output current IOHPD from Fig. C and equation (1).
sRelation between Output Current IO (Control
Current) and Motor Winding Current IOM
The SI-7502 uses the total current control system; therefore,
the output current IO is different from the motor winding current.
In a general pentagonal driving system, the current flows as
shown in Figure D. The relation between IO and IOM is as follows:
IO=4
×IOM
With some driving systems, the relation can also be as follows:
IO=2
×IOM
VRSH
RS
Application Notes
............................... (2)
IOH=
...................................................................... (1)
IOH=
(0.19
×Vb×-0.03)
1
RS


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