TLE4727 Datasheet, PDF (3/22 Pages) Siemens Semiconductor Group – 2-Phase Stepper-Motor Driver

TLE 4727
Pin Definitions and Functions
Pin No.
Function
1, 2, 19, 20
Digital control inputs IX0, IX1 for the magnitude of the current of
the particular phase.
3
4
5, 6, 15, 16
7, 10
8
9
11, 14
12
13
I_set = 500 mA with R_Sense = 1 Ω
Current Control Phase Current
IX1
IX0
Example of Motor
Status
H
H
0
No current ¹⁾
H
L
0.14 × I_set
L
H
I_set
L
L
1.4 × I_set
Hold
Normal mode
Accelerate
1) _{“No current” in both bridges inhibits the circuit and current consumption will sink}
below 3 mA.
Input Phase 1; controls the current through phase winding 1. On
H-potential the phase current flows from Q11 to Q12, on L-potential
in the reverse direction.
Oscillator; works at typ. 25 kHz if this pin is wired to ground across
2.2 nF.
Ground; all pins are connected at leadframe internally.
Push-pull outputs Q11, Q12 for phase 1 with integrated free-
wheeling diodes.
Resistor R₁ for sensing the current in phase 1.
Supply voltage; block to ground, as close as possible to the IC,
with a stable electrolytic capacitor of at least 47 µF in parallel with a
ceramic capacitor of 100 nF.
Push-pull outputs Q22, Q21 for phase 2 with integrated free
wheeling diodes.
Logic supply voltage; internally generated 5 V voltage for logic
supply up to 5 mA; short circuit protected. Block to ground with a
stable electrolytic capacitor of 4.7 µF.
Resistor R₂ for sensing the current in phase 2.
Semiconductor Group
3
1998-12-16