SAA1042

5

MOTOROLA ANALOG IC DEVICE DATA

Figure 7. Typical Application

Selectable Step Rates with the Time Base Derived from the Line Frequency

220 k

Set Input

RB

56 k

Steps/Sec

3

5

1

0.1

µF

50 Hz

220 V

15

14

Phase

Comp

MC14046B

16

12 V

VCO

4

7

6

11

9

2

82 k

8.2

µF

4.7 nF

120 k

f0 = 1400 Hz

12.5

25

50

100

200

400

800

1

2

7 12

5

9

6

11

4

3

14

5

3

Set

MC14007

VZ = 3.9 V

12 V

12 V

CW

CCW

Full

Half

Clock

12 V

8

7

10

9

6

14

16

1

3

2

15

11

M

L

L

Figure 8. Thermal Resistance and Maximum Power

Dissipation versus P.C.B. Copper Length

PD(max) for TA = 70°C

R

θJA

3.0 mm

1.0

0

2.0 oz

Copper

2.0

10

20

30

40

50

Graph represents symmetrical layout

Printed circuit board heatsink example

0

3.0

4.0

5.0

L, LENGTH OF COPPER (mm)

100

80

60

40

20

0