TLE4727 Datasheet, PDF (17/22 Pages) Siemens Semiconductor Group – 2-Phase Stepper-Motor Driver

TLE 4727
V _Osc
2.3 V
1.3 V _Oscillator
High Imped.
0V
Phase 1 ^H
L
Ι _{Rsense 1}
0
Phase change-over
t
t
t
V _Q11
+V_S
High
Impedance
V _Q12
+V_S
High
Impedance
Ι _set
Ι _{Phase 1}
slow current decay
T₁
Operating conditions:
V _S = 14 V
L _{phase 1} = 1 mH
R_{phase 1} = 4 Ω
Ι11 = H for t < T ₁
Ι11 = L for t > T ₁
Ι10 = Ι _2X = H
t
t
fast current
decay
t
- Ι _set
slow current decay
IED01779
Figure 8 Phase Reversal and Inhibit
Semiconductor Group
17
1998-12-16