Data Sheet

2001-04-09

2-Phase Stepper-Motor Driver
Bipolar-IC

TLE 4729 G

P-DSO-24-1, -3

Features

· 2

0.7 amp. full bridge outputs

· Integrated driver, control logic and current control

(chopper)

· Very low current consumption in inhibit mode
· Fast free-wheeling diodes
· Max. supply voltage 45 V
· Output stages are free of crossover current
· Offset-phase turn-ON of output stages
· All outputs short-circuit proof
· Error-flag for overload, open load, over-temperature
· SMD package P-DSO-24-3

Functional Description

TLE 4729 G is a bipolar, monolithic IC for driving bipolar stepper motors, DC motors and
other inductive loads that operate by constant current. It is fully pin and function
compatible except the current programming is inverse to the TLE 4729 G with an
additional inhibit feature. The control logic and power output stages for two bipolar
windings are integrated on a single chip which permits switched current control of motors
with 0.7 A per phase at operating voltages up to 16 V.

The direction and value of current are programmable for each phase via separate control
inputs. In the case of low at all four current program inputs the device is switched to
inhibit mode automatically. A common oscillator generates the timing for the current
control and turn-on with phase offset of the two output stages. The two output stages in
full-bridge configuration include fast integrated freewheeling diodes and are free of
crossover current. The device can be driven directly by a microprocessor in several
modes by programming phase direction and current control of each bridge
independently.

Type

Ordering Code

Package

TLE 4729 G

Q67006-A9225

P-DSO-24-3 (SMD)

TLE 4729 G

Data Sheet

2001-04-09

With the two error outputs the TLE 4729 G signals malfunction of the device. Setting the
control inputs high resets the error flag and by reactivating the bridges one by one the
location of the error can be found.

Pin Configuration
(top view)

Figure 1

GND

OSC

GND

Q11

AEP02195

Phase 1

Q12

Phase 2

Error 1

GND

Q21

Error 2

Q22

TLE 4729 G

TLE 4729 G

Data Sheet

2001-04-09

Pin Definitions and Functions

Pin

Function

1, 2, 23, 24

Digital control inputs

X0,

X1 for the magnitude of the current of the

particular phase.

"No current" in both bridges inhibits the circuit and current consumption will sink below

A (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

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

F 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

for sensing the current in phase 2.

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

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.

set

= 450 mA with

sense

= 1

Phase Current

Example of Motor Status

L L

No current

L H

0.155

set

Hold

H L

set

Normal mode

H H

1.55

set

Accelerate

TLE 4729 G

Data Sheet

2001-04-09

Absolute Maximum Ratings

= 40 to 150

Parameter

Symbol

Limit Values

Unit Remarks

min.

max.

Supply voltage

0.3

Error outputs

Err

0.3

45
3

V
mA

Output current

Ground current

GND

Logic inputs

XX; Phase 1, 2

Oscillator voltage

OSC

0.3

, R

input voltage

0.3

Junction temperature

150

Storage temperature

stg

150

Thermal resistances
Junction-ambient
Junction-ambient

(soldered on a 35

m thick

20 cm

PC board copper

area)

Junction-case

th ja

th jc

75
50

K/W
K/W

K/W

Measured on pin 5

Operating Range

Supply voltage

Case temperature

110

Measured on pin 5

diss

= 2 W

Output current

800

Logic inputs

+ 6

XX; Phase 1, 2

Error outputs

Err

25
1

V
mA

TLE 4729 G

Data Sheet

2001-04-09

Characteristics

= 6 to 16 V;

= 40 to 130

Parameter

Symbol

Limit Values

Unit Test Condition

min.

typ.

max.

Current Consumption

From +

XX = L;

= 12 V;

Q1, 2

= 0 A

Oscillator

Output charging current
Charging threshold
Discharging threshold
Frequency

OSC

OSCL

OSCH

OSC

90
0.8
1.7
18

120
1.3
2.3
24

150
1.9
2.9
30

V
V
kHz

OSC

= 2.2 nF

Phase Current (

= 9 ... 16 V)

Mode "no current"
Voltage threshold of
current Comparator at

sense

in mode:

Hold
Setpoint
Accelerate

40
410
630

70
450
700

100
510
800

mV
mV
mV

X0 = L;

X1 = L

X0 = H;

X1 = L

X0 = L;

X1 = H

X0 = H;

X1 = H

Logic Inputs (Phase X)

Threshold
Hysteresis
L-input current
L-input current
H-input current

IHy

1.2

10
100
1

1.7
200
1
20
0

2.2

1
5
10

V
mV

= 1.2 V

= 0 V

= 5 V

Logic Inputs (

X1;

X0)

Threshold
Hysteresis
L-input current
H-input current

IHy

0.8

100
5

1.7
200

20

2.2

+ 5
50

V
mV

= 0 V

= 5 V

TLE 4729 G

Data Sheet

2001-04-09

Error Outputs

Saturation voltage
Leakage current

ErrSat

ErrL

200

500
10

Err

= 1 mA

Err

= 25 V

Thermal Protection

Shutdown
Prealarm
Delta
Hysteresis shutdown
Hysteresis prealarm

jsd

jpa

jsdhy

jpahy

140
120
10

150
130
20
20
20

160
140
30

K
K
K

Q1, 2

= 0 A

Err

= L

jsd

jpa

Power Outputs
Diode Transistor Sink Pair
(D13, T13; D14, T14; D23, T23; D24, T24)

Saturation voltage
Saturation voltage
Reverse current
Forward voltage
Forward voltage

satI

0.1
0.2
500
0.6
0.7

0.3
0.5
1000
0.9
1.0

0.5
0.8
1500
1.2
1.3

V
V

= 0.45 A

= 0.7 A

= 40 V

= 0.45 A

= 0.7 A

Diode Transistor Source Pair
(T11, D11; T12, D12; T21, D21; T22, D22)

Saturation voltage
Saturation voltage

Reverse current
Forward voltage
Forward voltage
Diode leakage current

satuC

satuD

satuC

satuD

0.6
0.1

0.7
0.2

400
0.7
0.8
0

1.0
0.3

1.2
0.5

800
1.0
1.1
3

1.2
0.6

1.5
0.8

1200
1.3
1.4
10

V
V

V
V
mA

= 0.45 A; charge

= 0.45 A;

discharge

= 0.7 A; charge

= 0.7 A;

discharge

= 40 V,

= 0 V

= 0.45 A

= 0.7 A

Characteristics (cont'd)

= 6 to 16 V;

= 40 to 130

Parameter

Symbol

Limit Values

Unit Test Condition

min.

typ.

max.

TLE 4729 G

Data Sheet

2001-04-09

For details see next four pages.
These parameters are not 100% tested in production, but guaranteed by design.

Error Output Timing

Time Phase X to

Time

XX to Phase X

Delay Phase X to Error 2
Delay Phase X to Error 1
Delay

XX to Error 2

Reset delay after Phase X
Reset delay after

PEsc

PEol

IEsc

5
12
45
15
30
3
1

20
100
100
50
80
10
5

Characteristics (cont'd)

= 6 to 16 V;

= 40 to 130

Parameter

Symbol

Limit Values

Unit Test Condition

min.

typ.

max.

TLE 4729 G

Data Sheet

2001-04-09

This time strongly depends on +

and inductivity of the load, see diagram below.

Time

vs. Load Inductivity

Propagation Delay of the Error Flag

Operating conditions:
+

= 14 V,

= 25

err

= 1 mA, load = 3.3 mH, 1

16 V

12 V

9 V

V = 6 V

AED02199

PEsc

Error 2

AED02200

Phase X

XX = H, error condition: short circuit to GND.

typ.

PEsc

: 45

TLE 4729 G

Data Sheet

2001-04-09

Quiescent Current

vs. Supply Voltage

;

bridges not chopping;

= 25

Oscillator Frequency

Osc

vs.

Junction Temperature

Quiesc. Current

vs. Junct. Temp.

;

bridges not chopping,

= 14 V

Output Current

vs.

Junction Temperature

AED02205

0.70 A

0.45 A

0.07 A

-50

OSC

150

100

Osc

kHz

AED02207

= 14 V

= 2.2 nF

-50

150

100

0.07 A

0.70 A

0.45 A

AED02206

500

-50

300

100

400

200

= 14 V

150

100

700

800

600

X1 = H, X0 = H

AED02208

X1 = H, X0 = L

= 1

TLE 4729 G

Data Sheet

2001-04-09

Output Saturation Voltages

sat

vs. Output Current

Typical Power Dissipation

tot

vs.

Output Current

(non stepping)

Forward Current

of Free-Wheeling Diodes

vs. Forward Voltages

Permissible Power Dissipation

tot

vs.

Case Temp.

(measured at pin 5)

0.2

0.5

1.0

0.6

0.4

0.8

satuD

satl

satuC

sat

= 14 V

1.5

= 25 C

2.0

AED02209

both phases active

0.2

0.6

0.4

0.8

V = 14 V

tot

= 10 mH

OSC

phase x

= 25 C

= 2.2 nF

= 2

AED02211

AED02210

0.5

1.0

1.5

0.2

0.4

0.6

0.8

1.0

T = 25 °C

-25

125

C 175

120 C

jmax

150 C

tot

AED02212

TLE 4729 G

Data Sheet

2001-04-09

Input Characteristics of

, Phase X

Quiescent Current

vs. Supply Voltage

;

inhibit mode;

= 25

Output Leakage Current

-20

-120

-4

-6

-2

-60

-100

-40

-80

4 V

40 C

25 C

150 C

Phase X

AED02213

AED02215

100

15 V

250

200

150

-0.8

-0.4

0.4

30 V

V = 16 V

0.8

1.2

V = 40 V

AED02214

TLE 4729 G

Data Sheet

2001-04-09

Calculation of Power Dissipation

The total power dissipation

tot

is made up of

Saturation losses

sat

(transistor saturation voltage and diode forward voltages),

Quiescent losses

(quiescent current times supply voltage) and

Switching losses

(turn-ON / turn-OFF operations).

The following equations give the power dissipation for chopper operation without phase
reversal.
This is the worst case, because full current flows for the entire time and switching losses
occur in addition.

tot

= 2

sat

+ 2

where

sat

{

satI

) +

satuC

satuD

)}

= Nominal current (mean value)

= Quiescent current

= Reverse current during turn-on delay

= Peak reverse current

= Conducting time of chopper transistor

= Turn-ON time

OFF

= Turn-OFF time

DON

= Turn-ON delay

DOFF

= Turn-OFF delay

= Cycle duration

= Duty cycle

satl

= Saturation voltage of sink transistor (TX3, TX4)

satuC

= Saturation voltage of source transistor (TX1, TX2) during charge cycle

satuD

= Saturation voltage of source transistor (TX1, TX2) during discharge cycle

= Forward voltage of free-wheeling diode (DX1, DX2)

= Supply voltage

-------

DON

-------------------------

(

)

--------------------------------------

-----

DOFF

OFF

(

)

TLE 4729 G

Data Sheet

2001-04-09

Application Hints

The TLE 4729 G is intended to drive both phases of a stepper motor. Special care has
been taken to provide high efficiency, robustness and to minimize external components.

Power Supply

The TLE 4729 G will work with supply voltages ranging from 5 V to 16 V at pin

Surges exceeding 16 V at

wont harm the circuit up to 45 V, but whole function is not

guaranteed. As soon as the voltage drops below approximately 16 V the TLE 4729 G
works promptly again.

As the circuit operates with chopper regulation of the current, interference generation
problems can arise in some applications. Therefore the power supply should be
decoupled by a 0.1

F ceramic capacitor located near the package. Unstabilized

supplies may even afford higher capacities.

Inhibit Mode

In the case of low at all four current program inputs

XX the device will switch into inhibit

condition; the current consumption is reduced to very low values.

When starting operation again, i.e. putting at least one

XX to high potential, the Error 1

output signals an open load error if the corresponding phase input is high. The error is
reset by first recirculation in chop mode.

Current Sensing

The current in the windings of the stepper motor is sensed by the voltage drop across

sense

. Depending on the selected current internal comparators will turn off the sink

transistor as soon as the voltage drop reaches certain thresholds (typical 0 V, 0.07 V,
0.45 V and 0.7 V). These thresholds are not affected by variations of

. Consequently

instabilized supplies will not affect the performance of the regulation. For precise current
level it must be considered, that internal bounding wire (typ. 60 m

) is a part of

sense

Due to chopper control fast current rises (up to 10 A/

s) will occur at the sensing

resistors. To prevent malfunction of the current sensing mechanism

sense

should be

pure ohmic. The resistors should be wired to GND as directly as possible. Capacitive
loads such as long cables (with high wire to wire capacity) to the motor should be
avoided for the same reason.

Synchronizing Several Choppers

In some applications synchrone chopping of several stepper motor drivers may be
desirable to reduce acoustic interference. This can be done by forcing the oscillator of
the TLE 4729 G by a pulse generator overdriving the oscillator loading currents
(approximately

120

A). In these applications low level should be between 0 V and

0.8 V while high level should between 3 V and 5 V.

TLE 4729 G

Data Sheet

2001-04-09

Application Hints (cont'd)

Optimizing Noise Immunity

Unused inputs should always be wired to proper voltage levels in order to obtain highest
possible noise immunity.

To prevent crossconduction of the output stages the TLE 4729 G uses a special break
before make timing of the power transistors. This timing circuit can be triggered by short
glitches (some hundred nanoseconds) at the phase inputs causing the output stage to
become high resistive during some microseconds. This will lead to a fast current decay
during that time. To achieve maximum current accuracy such glitches at the phase
inputs should be avoided by proper control signals.

To lower EMI a ceramic capacitor of max. 3 nF is advisable from each output to GND.

Thermal Shut Down

To protect the circuit against thermal destruction, thermal shut down has been
implemented.

Error Monitoring

The error outputs signal corresponding to the logic table the errors described below.

Over-Temperature is implemented as pre-alarm; it appears approximately 20 K before
thermal shut down. To detect an open load, the recirculation of the inductive load is
watched. If there is no recirculation after a phase change-over, an internal error flipflop
is set. Because in most kinds of short circuits there won't flow any current through the
motor, there will be no recirculation after a phase change-over, and the error flipflop for
open load will be set, too. Additionally an open load error is signaled after a phase
change-over during hold mode.

Logic Table

Kind of Error

Error Output

Error 1

Error 2

a) No error

b) Short circuit to GND

c) Open load

Also possible: short circuit to +

or short circuit of the load.

d) b) and c) simultaneously

e) Temperature prealarm

TLE 4729 G

Data Sheet

2001-04-09

Only in the case of a short circuit to GND, the most probably kind of a short circuit in
automotive applications, the malfunction is signaled dominant (see d) in logic table) by
a separate error flag. Simultaneously the output current is disabled after 30

s to prevent

disturbances.

A phase change-over or putting both current control inputs of the affected bridge on low
potential resets the error flipflop. Being a separate flipflop for every bridge, the error can
be located in easy way.

TLE 4729 G

Data Sheet

2001-04-09

Package Outlines

15.6

-0.4

Index Marking

1.27

0.35

+0.15

0.2 24x

-0.2

2.65 max

0.1

0.2

-0.1

2.45

-0.2

7.6

0.35 x 45°

8°

max

0.23

+0.09

10.3

±0.3

0.4

+0.8

1) Does not include plastic or metal protrusions of 0.15 max rer side

2) Does not include dambar protrusion of 0.05 max per side

GPS05144

P-DSO-24-3
(Plastic Dual Small Outline Package)

SMD = Surface Mounted Device

Dimensions in mm

Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book "Package Information".

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