L6208Q View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6208Q' PDF : 34 Pages View PDF
Output current capability and IC power dissipation
L6208Q
7
Output current capability and IC power dissipation
Figure 26, 27, 28 and 29 show the approximate relation between the output current and the
IC power dissipation using PWM current control driving a two-phase stepper motor, for
different driving sequences:
HALF STEP mode (Figure 26) in which, alternately, one phase / two phases are
energized.
NORMAL DRIVE (FULL STEP TWO-PHASE-ON) mode (Figure 27) in which two
phases are energized during each step.
WAVE DRIVE (FULL STEP ONE-PHASE-ON) mode (Figure 28) in which only one
phase is energized at each step.
MICROSTEPPING mode (Figure 29), in which the current follows a sinewave profile,
provided through the Vref pins.
For a given output current and driving sequence the power dissipated by the IC can be
easily evaluated, in order to establish which package should be used and how large the
onboard copper dissipating area must be to guarantee a safe operating junction
temperature (125 °C maximum).
Figure 26. IC power dissipation vs. output current in half step mode
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