L6258EA Datasheet, PDF (12/32 Pages) STMicroelectronics – PWM controlled high current DMOS universal motor driver

Functional description
Figure 5. Current control loop block diagram
L6258EA
POWER AMPL.
VREF
I0
I1
I2
I3
PH
INPUT TRANSCONDUCTANCE
AMPL.
ERROR AMPL.
ia
+
DAC VDAC
-
V_R
+
-
ic
Rc
Cc
ib
Gin=1/Ra
Tri_0
-
+
-
+
Tri_180
VSENSE
Gs=1/Rb
SENSE TRANSCONDUCTANCE
AMPL.
VS
OUTA
LOAD
R_L
L_L
VS
R_S
OUTB
D97IN625
2.2
Input logic (I₀ - I₁ - I₂ - I₃)
The current level in the motor winding is selected according to this table:
Table 5. Current levels
I3
I2
I1
I0
H
H
H
H
H
H
H
L
H
H
L
H
H
H
L
L
H
L
H
H
H
L
H
L
H
L
L
H
H
L
L
L
L
H
H
H
L
H
H
L
L
H
L
H
Current level
% of IMAX
No Current
9.5
19.1
28.6
38.1
47.6
55.6
63.5
71.4
77.8
82.5
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