2.5-A High Performance Smart Power
Stepper-Motor Driver with Diagnostic Interface
TLE 5250
SPT-IC
Overview
Features
•
•
•
•
•
•
•
•
•
•
•
•
Single phase driver for stepper motor 2.5 A
Low ON-resistance (typical 0.3
Ω)
Wide supply range 6 V to 45 V
Wide current range 10 mA to 3 A
Fast nominal/actual comparator for micro
stepper mode
Wide temperature range
Short circuit protection
Under voltage shutdown
Overtemperature shutdown
Serial diagnostic interface
Fast freewheeling diodes
TTL-compatible inputs
P-SIP-15-1
Type
TLE 5250
Description
Ordering Code
Q67000-A9103
Package
P-SIP-15-1
TLE 5250 is a monolithic IC in Smart Power technology for controlling and regulating the
motor current in one phase of a bipolar stepping motor. There are other applications in
driving DC motors and inductive loads that are operated on constant current.
The device has TTL-compatible logic inputs, includes a H-bridge with integrated, fast
free-wheeling diodes plus dynamic limiting of the motor current by a chopper mode. The
nominal current can be set continuously by a control voltage. Microstep mode can be
produced by applying a sinusoidal control voltage. Two TLE 5250s, with a minimum of
external circuitry and a single supply voltage, form a complete system - that can be
driven direct by an MC- for two-phase, bipolar stepping motors with output current of up
to 2.5 A per phase. The outputs of the IC are internally protected against shorted to
ground, supply voltage and shorted load. The output stages are also disabled by
undervoltage and overtemperature. All fault functions can be detected by the internal
diagnostics, which can be read out serially.
Semiconductor Group
1
1998-02-01
TLE 5250
1
15
DIAG
PH
EN
V
S
Q1
Q1
Sense
GND
Sense
Q2
Q2
V
S
RS
NOM
ACT
AEP01471
Figure 1
Pin Configuration
(top view)
Semiconductor Group
2
1998-02-01
TLE 5250
Pin Definitions and Functions
Pin No.
1
2
Symbol
DIAG
PH
Function
Open-drain diagnostics output
Input for determining source/sink on outputs Q1 and Q2; when
Enable = Low, this pin serves as clock input for reading out
diagnostics
Input for activating or turning off device (all output transistors
turned off); Enable High = output active, Enable
Low = diagnostics
Supply voltage of IC
Power output with integrated free-wheeling diodes
Actual-current output: shared, open-source output of sink
transistors
Ground
Power output with integrated free-wheeling diodes
Determines turning back on of sink transistor by internally
driven, external RC element or external TTL trigger signal
Input for reference potential (nominal current) for nominal/
actual comparator
Input for actual current for nominal/actual comparator
3
EN
4, 12
5, 6
7, 9
8
10, 11
13
14
15
V
S
Q1
Sense
GND
Q2
RS
NOM
ACT
Semiconductor Group
3
1998-02-01
Cooling Pin
16
4
Bandgap/Bias
Charge Pump
V
S
V
S
V
CC1
V
CC2
Bias
V
S
-6 V
12
Figure 2
V
S
Semiconductor Group
Driver 1
T1
T2
Driver 2
T1
T2
T3
T4
Functional
Logic
Q1 High
+
-
Undervoltage
Block Diagram
V
S
-1.5 V
+
-
5
Q1
6
Q2 High
Overtemperature
Enable
3
Phase
2
V
S
-1.5 V
Overload
+
-
Q2 Low
+
-
3V
3V
Q1 Low
H-Bridge
Output Stage
10
Q2
11
4
G on T4
+
-
5V
+
-
G on T5
5V
Diagn
1
Diagnostics
Logic
PWM Logic
Off/
Ι
Charge
V
ref
Chop Logic
Nom/Act
Comp
1 mA
+
-
13
RC/Sync
Nominal
14
Driver 3
T3
T4
Driver 4
+
-
15
8
GND
7
Sense
9
Sense
AEB01468
TLE 5250
1998-02-01
Actual
TLE 5250
Application
Two TLE 5250 drivers are required to operate a bipolar stepping motor. To implement
full-step operation, a squarewave voltage with the required stepping frequency is applied
to the phase input of the upper driver, and the same squarewave voltage, but offset in
phase by 90°el, to the phase input of the lower driver. Motor-current limiting is produced
by a DC signal that is applied to both nominal-current inputs. In microstep operation the
nominal current tracks sinusoidally and synchronously with the required stepping
frequency. This produces a sinusoidal current in the motor windings to ensure very
smooth running and a high stepping frequency. If an instantaneous nominal value (sine
or cosine) is held on the second driver, it is possible to set a certain angle of rotation while
the motor is stationary. The motor current produced by this depends on nominal voltage
and sense resistance (normally 0.5
Ω),
i.e.
V
nom
[
V
]
I
M
[
V
]
=
----------------------
-
R
S
[ Ω ]
The actual voltage should be thoroughly filtered for precise current regulation, especially
in microstep operation. So the actual input is accessible, and an RC element is
necessary between the Sense output and Actual input. The resistance
R
R
should
correspond to the internal resistance of the nominal-current input-voltage source to
prevent additional voltage offset on the nominal/actual comparator.
Circuit Description
Outputs
Outputs Q1 and Q2 are fed by push-pull output stages. Four integrated free-wheeling
diodes referred to ground or the supply voltage protect the integrated circuit against
reverse voltages from an inductive load.
Enable and Phase
Outputs Q1 and Q2 can be disabled by a voltage
V
Inh
of
≤
0.8 V on the Enable pin. The
sink transistors are enabled by
V
Inh
≥
2 V.
The voltage on the Phase input determines the phase of the output current. Output Q1
acts as a sink for
V
Ph
≤
0.8 V and as a source for
V
Ph
≥
2 V.
For output Q2 this is reversed: sink for
V
Ph
≥
2 V and source for
V
Ph
≤
0.8 V.
The sink transistors are chopped. Low signal on the Enable pin plus a clock signal on the
Phase pin enable readout of the multiplexer.
Semiconductor Group
5
1998-02-01
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