L6228Q View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6228Q' PDF : 32 Pages View PDF
L6228Q
Output current capability and IC power dissipation
6
Output current capability and IC power dissipation
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 (see
Figure 26, Figure 27, Figure 28 and Figure 29):
● 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 27) in which only one
phase is energized at each step.
● MICROSTEPPING mode (Figure 29), in which the current follows a sine wave 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 on-
board copper dissipating area must be to guarantee a safe operating junction temperature
(125 °C maximum).
Figure 26. IC power dissipation versus output current in HALF-STEP mode
HALF STEP
10
IA
8
IB
6
PD [W]
4
2
0
0 0.25 0.5 0.75 1 1.25 1.5
I OUT [A ]
IOUT
IOUT
Test Conditions:
Supply Voltage = 24V
No PWM
fSW = 30 kHz (slow decay)
Doc ID 14321 Rev 5
25/32
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