TLE4729G datasheet(3/29 Pages) INFINEON

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Pin Definitions and Functions

Function

1, 2, 23, 24

Digital control inputs IX0, IX1 for the magnitude of the current of the

particular phase.

Iset = 450 mA with Rsense = 1 Ω

X1 IX0

Phase Current

Example of Motor Status

No current1)

0.155

× I

set

Hold

Iset

Normal mode

1.55

× I

set

Accelerate

1) “No current” in both bridges inhibits the circuit and current consumption will sink below

µA (inhibit-mode)

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.

Oscillator; works at approx. 25 kHz if this pin is wired to ground across

2.2 nF.

Resistor

R1 for sensing the current in phase 1.

9, 12

Push-pull outputs Q11, Q12 for phase 1 with integrated free-wheeling

diodes.

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.

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.

Resistor

R2 for sensing the current in phase 2.

Error 1 output; signals with “low” the errors: open load or short circuit to

VS of one or more outputs or short circuit of the load or over-

temperature.

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.

TLE 4729 G

Data Sheet

V1.2, 2008-03-18

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