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LT1787 Datasheet(PDF) 21 Page - Analog Devices

Part # LT1787
Description  Current Sense Amplifier, Reference and Comparator with POR
PDF  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT1787 Datasheet(HTML) 21 Page - Analog Devices

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LT6118
21
6118f
For more information www.linear.com/LT6118
Typical applicaTions
MCU Interfacing with Hardware Interrupts
SENSEHI SENSELO
OUTA
0.1
V+
100
LT6118
V–
TO LOAD
VOUT
ADC IN
8.66k
1.33k
INC
V+
LE
OUTC
6
1
5
4
8
7
2
3
VLE
6118 TA03
10k
5V
VOUT/ADC IN
AtMega1280
PB0
PB1
PCINT2
PCINT3
ADC2
PB5
5
6
7
2
3
1
OVERCURRENT ROUTINE
RESET COMPARATOR
MCU INTERUPT
OUTC GOES LOW
5V
0V
6118 TA03b
Example:
The comparator is set to have a 300mA overcurrent
threshold. The MCU will receive the comparator output as
a hardware interrupt and immediately run an appropriate
fault routine.
Simplified DC Motor Torque Control
The figure above shows a simplified DC motor control
circuit. The circuit controls motor current, which is pro-
portional to motor torque; the LT6118 is used to provide
current feedback to an integrator that servos the motor
current to the current set point. The LTC®6992 is used to
convert the output of the difference amp to the motors
PWM control signal.
SENSEHI SENSELO
OUTA
8
1
6
5
7
2
3
4
LT6118
V–
9k
100k
2
3
7 LTC6246
4
6
1
3
6
IRF640
5V
1N5818
0.1
VMOTOR
5
4
2
0.47µF
VOUT
CURRENT SET POINT (0V TO 5V)
1k
1M
6118 TA04
1k
78.7k
100k
280k
INC
V+
LE
OUTC
VLE
100µF
LTC6992-1
V+
GND
5V
1µF
BRUSHED
DC MOTOR
(0A TO 5A)
MABUCHI
RS-540SH
MOD
SET
OUT
DIV



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