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SI-7500A 数据表(PDF) 3 Page - Sanken electric

部件名 SI-7500A
功能描述  5-phase Stepper Motor Star Connection Unipolar Driver IC
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-7500A 数据表(HTML) 3 Page - Sanken electric

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SI-7500A
Application Note
s Determining the output current IO (motor coil current)
The main elements that determine the output current are
Current detection resistor Rs, Supply voltage Vb, and Vari-
able current resistor RX.
(1) Normal mode
To operate a motor at maximum current level, set RX to
infinity (open).
From Fig. A, when the maximum output current ripple is
designated as IOH, its value will be,
VRSH
IOH =
....................................................... [A]
RS
VRSH can be computed as follows:
VRSH = 0.2 Vb + 0.213 (center value) .............. [B]
From equations [A] and [B], the output current IOH can
be computed as follows:
I
IOH =
(0.2 Vb + 0.213)
RS
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 the Fig. B even when RS is retained. Obtain
the power down output current IOHPD from Fig. B and
equation [A].
s Thermal design
Obtain the internal power dissipation that corresponds to the output current to be required from Fig. C, multiply this by three,
and determine the size of the heatsink from the derating curve in Fig. D. The derating curve is based on junction
temperature of 125
°C. However, make some allowance so that Tc is 85°C or less and then select the proper heatsink size.
Fig. C SI-7500A Internal power dissipation per phase PD
vs. Output current IO
Fig. D SI-7500A Derating curve
Fig. B
VRSH Max. (Vb
= 5.0V)
VRSH Min. (Vb = 5.0V)
VRSH(max) =
+ 0.2 (V)
Vb + 0.1
4.69 +
1.92
Rx
VRSH(min) =
+ 0.15 (V)
Vb + 0.09
5.25 +
2.06
Rx
(Rx : k
Ω)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1234
External resistor Rx (k
Ω)
Waveform of output current
Fig. A
IOH
Motor : PH566-B
Vb = 5V
Holding mode
VCC = 30V
24V
20V
6
5
4
3
2
1
0
0
0.2
0.4
0.6
0.8
1.0
1.2
Output current lo (A)
(Typical
value)
150
× 100
100
× 100
50
× 100
Without
heatsink
20
15
10
5
0
Heatsink : Aluminum
Thickness : 2 mm
0
204060
80
Ambient temperature Ta (°C)


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