NJM#37770D3 NJR, NJM#37770D3 Datasheet
NJM#37770D3
Specifications of NJM#37770D3
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NJM#37770D3 Summary of contents
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GENERAL DESCRIPTION NJM37770 is a stepper motor driver, which consists of a LS-TTL compatible logic input stage, a current sensor, a monostable multivibrator and a high power H-bridge output stage. The NJM37770 is a high power version and pincompatible ...
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PIN CONFIGURATION ■ PIN DESCRIPTION DIP EMP Symbol 3,14 3, 4,5, 4-7 GND 12,13 14- Phase ...
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FUNCTIONAL DESCRIPTION The NJM37770 is intended to drive a bipolar constant current through one winding of a 2-phase stepper motor. Current control is achieved through switched-mode regulation, see figure 3 and 4. Three different current levels and zero current ...
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Current level selection. The status of I and I inputs determines the current level in the motor winding. Three fixed current levels can selected according to the table below. Motor current I 0 High level 100% L ...
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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 (T Parameter Logic supply voltage Motor ...
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ELECTRICAL CHARACTERISTICS Electrical characteristics over recommended operating conditions, unless otherwise specified.T R =56kΩ T Parameter General Supply current Total power dissipation Turn-off delay Thermal shutdown junction temperature Logic Inputs Logic HIGH input voltage Logic LOW input voltage Logic HIGH ...
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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 constant 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 Sensor resistor The R resistor should noninductive type power resistor. A 0.5 ohm resistor, tolerance ≤ 1 good choice for S ...
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Heatsinking The junction temperature of the chip highly effects the lifetime of the circuit. In high-current applications, the heatsinking must be carefully considered. The Rth of the NJM37770 can be reduced by soldering the ground pins to a suitable copper ...
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TYPICAL CHARACTERISTICS Figure 11. Typical source saturation vs. output current Figure 13. Typical sink saturation vs. output current Figure 15. Allowable power dissipation vs. ambient temperature - 10 - Figure 12. Typical lower diode voltage drop vs. recirculating current ...