Datasheet

TLE 4729 G
Data Sheet 3 2005-01-17
Pin Definitions and Functions
Pin Function
1, 2, 23, 24 Digital control inputs IX0, IX1 for the magnitude of the current of the
particular phase.
1)
“No current” in both bridges inhibits the circuit and current consumption will sink below
50 µA (inhibit-mode)
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 Resistor
R
1
for sensing the current in phase 1.
9, 12 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 over-temperature.
13, 16 Push-pull outputs Q22, Q21 for phase 2 with integrated free-wheeling
diodes.
15 Resistor
R
2
for sensing the current in phase 2.
21 Error 1 output; signals with “low” the errors: open load or short circuit to
+
V
S
of one or more outputs or short circuit of the load or over-
temperature.
22 Input phase 2; controls the current flow through phase winding 2. On
H-potential the phase current flows from Q21 to Q22, on L-potential in
the reverse direction.
I
set
= 450 mA with R
sense
= 1 Ω
IX1 IX0 Phase Current Example of Motor Status
L L 0 No current
1)
L H 0.155 × I
set
Hold
H L
I
set
Normal mode
H H 1.55 ×
I
set
Accelerate