SI-7502 datasheet(4/5 Pages) SANKEN

Part #	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

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4 / 5 page

107

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

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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