TLE4728G Datasheet, PDF (3/25 Pages) Infineon Technologies AG – 2-Phase Stepper-Motor Driver

TLE 4728 G
Pin Definitions and Functions
Pin No.
Function
1, 2, 23, 24
Digital control inputs IX0, IX1 for the magnitude of the current of the
particular phase.
I_set = 450 mA with R_sense = 1 Ω
IX1 IX0
Phase Current
Example of Motor
Status
HH
0
No current¹⁾
HL
LH
LL
0.155 × I_set
I_set
1.55 × I_set
Hold
Normal mode
Accelerate
1) _{“No current” in both bridges inhibits the circuit and current consumption will sink}
below 3 mA
3
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.
5 ... 8, 17 ... 20 Ground; all pins are connected at leadframe internally.
4
Oscillator; works at approx. 25 kHz if this pin is wired to ground across
2.2 nF.
10
9, 12
Resistor R₁ for sensing the current in phase 1.
Push-pull outputs Q11, Q12 for phase 1 with integrated free-wheeling
diodes.
11
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.
14
Error 2 output; signals with “low” the errors: short circuit to ground of
one or more outputs or overtemperature.
13, 16
Push-pull outputs Q22, Q21 for phase 2 with integrated free-wheeling
diodes.
15
Resistor R₂ for sensing the current in phase 2.
Data Sheet
3
2004-03-01