2-Phase Stepper-Motor Driver
TLE 4726
Bipolar IC
Overview
Features
• 2
×
0.75 A / 50 V outputs
• Integrated driver, control logic and
current control (chopper)
• Fast free-wheeling diodes
• Low standby-current drain
• Full, half, quarter, mini step
P-DSO-24-3
Type
TLE 4726 G
Description
Ordering Code
Q67006-A9297
Package
P-DSO-24-3
TLE 4726 is a bipolar, monolithic IC for driving bipolar stepper motors, DC motors and
other inductive loads that operate on constant current. 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 0.75 A per phase at operating voltages up to
50 V.
The direction and value of current are programmed for each phase via separate control
inputs. 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 a full-bridge configuration
have integrated, fast free-wheeling diodes and are free of crossover current. The logic
is supplied either separately with 5 V or taken from the motor supply voltage by way of
a series resistor and an integrated Z-diode. The device can be driven directly by a
microprocessor with the possibility of all modes from full step through half step to mini
step.
Data Sheet
1
1999-09-15
TLE 4726
Ι
10
Ι
11
Phase 1
OSC
GND
GND
GND
GND
Q11
R
1
+
V
S
Q12
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IEP00898
Ι
20
Ι
21
Phase 2
Inhibit
GND
GND
GND
GND
Q21
R
2
+
V
L
Q22
Figure 1
Pin Configuration
(top view)
Data Sheet
2
1999-09-15
TLE 4726
Pin Definitions and Functions
Pin No.
1, 2, 23, 24
Function
Digital control inputs
IX0, IX1
for the magnitude of the
current
of the
particular phase.
IX1
H
H
L
L
3
IX0
H
L
H
L
Phase
Current
0
1/3
I
max
2/3
I
max
Example of
Motor Status
No current
Hold
Set
Accelerate
typical
I
max
with
R
sense
= 1
Ω:
750 mA
I
max
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,
Ground;
all pins are connected internally.
18, 19, 20
4
10
9, 12
11
Oscillator;
works at approx. 25 kHz if this pin is wired to ground across
2.2 nF.
Resistor
R
1
for sensing the current in phase 1.
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 10
µF
in parallel with a ceramic
capacitor of 220 nF.
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.
Push-pull outputs Q22, Q21
for phase 2 with integrated free-wheeling
diodes.
Resistor
R
2
for sensing the current in phase 2.
Inhibit input;
the IC can be put on standby by low potential on this pin.
This reduces the current consumption substantially.
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.
3
1999-09-15
14
13, 16
15
21
22
Data Sheet
TLE 4726
+
V
L
14
4
Oscillator
D11
T11
Ι
10
1
D13
Ι
11
2
Functional
Logic
Phase 1
T13
+
V
S
11
D12
T12
9
Q11
Phase 1
D14
T14
12
Q12
Phase 1
3
10
R
1
Inhibit
21
Inhibit
D21
T21
D22
T22
16
Q21
Ι20
24
D23
D24
T24
13
T23
Q22
Phase 2
Functional
Logic
Phase 2
Ι21
23
Phase 2
22
5-8, 17-19
GND
15
R
2
IEB00899
Figure 2
Block Diagram
Data Sheet
4
1999-09-15
TLE 4726
Absolute Maximum Ratings
T
A
= – 40 to 125
°C
Parameter
Supply voltage
Logic supply voltage
Z-current of
V
L
Output current
Ground current
Logic inputs
Symbol
Limit Values
min.
max.
52
6.5
50
1
2
V
V
mA
A
A
V
V
°C
°C
°C
–
Z-diode
–
–
–
0
0
–
–1
–2
–6
– 0.3
–
–
– 50
Unit Remarks
V
S
V
L
I
L
I
Q
I
GND
V
Ixx
V
RX,
V
OSC
T
j
T
j
T
stg
V
L
+
0.3
I
XX
; Phase 1, 2;
Inhibit
–
–
max. 10,000 h
–
R
1
,
R
2
, oscillator input voltage
Junction temperature
Storage temperature
V
L
+
0.3
125
150
125
Note: Stresses above those listed here may cause permanent damage to the
device. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Data Sheet
5
1999-09-15
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