TLE4726G datasheet(3/23 Pages) INFINEON

Part #	TLE4726G

Description	2-Phase Stepper-Motor Driver

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Manufacturer	INFINEON [Infineon Technologies AG]

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TLE 4726

Data Sheet

3

1999-09-15

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.

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, 6, 7, 8, 17,

18, 19, 20

Ground; all pins are connected 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 10

µF in parallel with a ceramic

capacitor of 220 nF.

14

Logic supply voltage; either supply with 5 V or connect to +

V

S across

a series resistor. A Z-diode of approx. 7 V is integrated. In both cases

block to ground directly on the IC with a stable electrolytic capacitor of

10

µF in parallel with a ceramic capacitor of 100 nF.

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

Inhibit input; the IC can be put on standby by low potential on this pin.

This reduces the current consumption substantially.

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.

IX1

IX0

Phase

Current

Example of

Motor Status

H

0

No current

H

L

1/3

I

max

Hold

L

H

2/3

I

max

Set

LL

I

max

Accelerate

typical

I

max with

R

sense = 1 Ω: 750 mA

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