IM2000S Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
IM2000S Datasheet PDF : 16 Pages
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Example Application of the Power Control Outputs
IM2000
SIGNA
ENAN
PWMA
+5V
10k
OVTMP
SIGNB
ENBN
PWMB
PHASE A
3 DIR
4 BRAKE
5 PWM
9 TFLAG
7 GND
VS
OUT1
6
2
BOOT1 1
BOOT2 11
OUT2 10
VSEN 8
PHASE B
3 DIR
4 BRAKE
5 PWM
9 TFLAG
7 GND
6
VS
OUT1
2
BOOT1 1
BOOT2 11
OUT2 10
VSEN 8
IM2000 Interface for the
National Semiconductor LMD18200 &
International Rectifier IR8200B
IM2000
ENA
HLA
HRA
ENB
HLB
HRB
6
ENA
5 IN1
7 IN2
9
VSS
8 GND
11
ENB
10
IN3
12 IN4
4
VS
2
OUT1
3
OUT2
PHASE A
13
OUT3
14
OUT4
PHASE B
15
VSENB
1
VSENA
IM2000 Interface for the
SGS Thomson L298
Figure 3.6: Power Control Output Interface Examples
Current Control
Digital Current Control
The schematic example shown in Figure 3.7 illustrates
how the user might set up the 0 to 2V D/A reference to
control the output current of the driver.
+5V
+V
LM234Z
Automatic Current Reduction
The IM2000S contains an auto-current reduction circuit
which will automatically set the CURRED output
HIGH approximately 1.5 seconds after the rising edge
of the last step clock pulse. This output, coupled with a
minimum of external components may be used to
reduce the current in the windings when the motor is at
a standstill.
INPUT FROM COUT
INPUT FROM DIR
>INC
VH
U/D
VW
CS
VL
X9C102
0 TO 2V REFERENCE
FOR D/A CONVERTERS
Figure 3.7: Digital Current Control Example
CURRENT REDUCTION
RESISTOR
TO CURRENT
ADJUST CIRCUIT
CURRENT ADJUST
RESISTOR
INPUT FROM
CURRED
VN0300 OR
EQUIVALENT
The CURRED output will then be reset on the next rising edge of the step clock
input. This feature can greatly reduce motor and driver heating. It may also
increase power efficiency in systems not requiring full holding torque.
Note that although both phases are reduced by the same percentage when using
the Automatic Current reduction feature, motor shaft movement may occur,
depending on shaft positioning and load type.
Figure 3.8: Automatic Current Reduction
12
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