AN1451 datasheet(28/43 Pages) STMICROELECTRONICS

28 / 43 page

AN1451 APPLICATION NOTE

28/43

Figure 30. Microstepping Application.

Figure 31. Microstepping reference voltages, output currents and CLOCK signal.

Especially at high rotation speeds, slow decay mode can be inadequate since it does not allow the motor current

to decay fast enough, following the decreasing slope of the desired sine wave. In this case it's possible to apply

the fast decay mode just during the negative slope of the current (see Figure 32). The disadvantage is an in-

creased current ripple in the other winding (where the current is increasing and fast decay in not needed).

µC

L 6 208

V refA

V refB

CO N T RO L

CW /CCW

CL O C K

RE S E T

56k

Ω

56k

Ω

10nF

100 k

Ω

5.6nF

H A L F/FU L L

PW M A

PW M B

OU T 1

OU T 2

OU T 3

OU T 4

OU T 5

10 nF

15 k

Ω

15 k

Ω

refA

refB

OUTB

OUTA

CLOCK

MAX * RSENSE

0 V

MAX * RSENSE

0 V

MAX

-I

MAX

-I

MAX

5 V

0 V

90 °

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