SMA7036M datasheet(6/7 Pages) SANKEN

Part #	SMA7036M

Description	2-Phase Stepper Motor Unipolar Driver IC

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Manufacturer	SANKEN [Sanken electric]

Direct Link	http://www.sanken-ele.co.jp/en

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SMA7036M

2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation)

Output current IO (A)

Motor : 23LM-C004

Holding mode

0

0.2

0.4

0.6

0.8

1.0

1.2

1.0

0.8

0.6

0.4

0.2

0

VCC

=44V

36V

24V

15V

Fig. 6 Heat dissipation per phase PH vs. Output current IO

∆T

j

1

02

3

4

∆T

C

Natural cooling

Without heatsink

150

100

50

0

Total Power (W)

Fig. 7 Temperature rise

Thermal characteristics

30

25

20

15

10

5

0

200

500

1K

Motor : PH265-01B

Motor current IO=0.8A

Ta=25

°C

VCC=24V, VS=24V

2-phase excitation

Response frequency (pps)

Without heatsink

Natural cooling

TC ( 4 pin)

sThermal Design

An outline of the method for calculating heat dissipation is

shown below.

(1) Obtain the value of PH that corresponds to the motor coil

current IO from Fig. 6 "Heat dissipation per phase PH vs. Out-

put current IO."

(2) The power dissipation Pdiss is obtained using the following

formula.

2-phase excitation: Pdiss

≅ 2PH+0.015×VS (W)

1-2 phase excitation: Pdiss

≅

PH+0.015

×VS (W)

(3) Obtain the temperature rise that corresponds to the calcu-

lated value of Pdiss from Fig. 7 "Temperature rise."

3

2

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