NJM3717E2 NJR, NJM3717E2 Datasheet
NJM3717E2
Specifications of NJM3717E2
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NJM3717E2 Summary of contents
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... DIP16 / PLCC28 / EMP20 BLOCK DIAGRAM Phase GND Figure 1. Block diagram STEPPER MOTOR DRIVER 5 - 1200 Schmitt Time Trigger Delay & & & & + – + – Monostable + t = 0.69 • R • C off T – Current Sensor T NJM3717 PACKAGE OUTLINE NJM3717D2 NJM3717E2 NJM3717FM2 Output Stage T NJM3717 E ...
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PIN CONFIGURATIONS NJM GND GND 4 13 3717D2 GND GND Phase ...
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V Figure 3. Definition of terms FUNCTIONAL DESCRIPTION The NJM3717 is intended to drive a bipolar constant current through one motor winding of a 2-phase stepper motor. Current control is achieved through switched-mode regulation, see figure 4 and ...
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Current sensor The current sensor contains a reference voltage divider and three comparators for measuring each of the select- able current levels. The motor current is sensed as a voltage drop across the current sensing resistor, R compared with one ...
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Figure 4. Motor current ( Vertical : 200 mA/div, Horizontal: 1 ms/div, expanded part 100 s/div Phase shift here gives fast current decay ...
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ABSOLUTE MAXIMUM RATINGS Parameter Voltage Logic supply Motor supply Logic inputs Comparator input Reference input Current Motor output current Logic inputs Analog inputs Temperature Operating junction temperature Storage temperature RECOMMENDED OPERATING CONDITIONS Parameter Logic supply voltage Motor supply voltage Motor ...
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ELECTRICAL CHARACTERISTICS Electrical characteristics over recommended operating conditions, unless otherwise noted - 820 pF kohm Parameter General Supply current Total power dissipation Turn-off delay Thermal shutdown junction temperature Logic Inputs Logic ...
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Applications Information Motor selection Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a con- stant current through the motor, its temperature can increase, both at low- and high-speed operation. Some stepper motors ...
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Analog control As the current levels can be continuously controlled by modulating the V achieved. Switching frequency The motor inductance, together with the pulse time, t The choice of motor may then require other values on the R to obtain ...
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TYPICAL CHARACTERISTICS V (V) Sat 1.8 1.6 1 125 C j 1.2 1 .20 .40 .60 .80 I (A) M Figure 11. Typical source saturation vs. output ...