NJM3772 New Japan Radio, NJM3772 Datasheet
NJM3772
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NJM3772 Summary of contents
Page 1
... GENERAL DESCRIPTION The NJM3772 is a stepper motor driver, which circuit is especially developed for use in microstepping applications in conjunction with the matching dual DAC (Digital-to-Analog Converter) NJU39610. The NJM3772 contains a clock oscillator, which is common for both driver channels, a set of comparators and flip-flops implementing the switching control, and two H-bridges with internal recirculation diodes ...
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... MM2 Phase BB2 See Applications information, External components. B2 MM2 See Applications information, External components. B1 MM1 is HIGH 2 2 HIGH. 2 NJM3772 Phase GND 5 18 NJM GND ...
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... FUNCTIONAL DESCRIPTION Each channel of the NJM3772 consists of the following sections: an output H-bridge with four transistors, capable of driving up to 1000 mA continuous current to the motor winding; a logic section that controls the output transis- tors; an S-R flip-flop; and a comparator. The clock-oscillator is common to both channels. Constant current control is achieved by switching the output current to the windings. This is done by sensing the peak current through the winding via a current-sensing resistor R winding during the turn-on period ...
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... — 17 GND R2 2 MM2 820 NJM3772 Symbol Min - -1200 +1200 -55 S ...
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... T T Symbol Conditions Rth DIP package J-GND Rth DIP package. Note 2 J-A Rth PLCC package J-GND Rth PLCC package. Note 2 J-A 2 PCB copper area with free air convection 26.5 kHz NJM3772 < 125 C J Min Typ - mA 160 50 mV 1.4 2 ...
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... R S i.e., with a recommended value of 0.47 ohm for the sensing resistor R 960 mA. To improve noise immunity on the V changed to 1 ohm 0 3300 pF GND (V Figure 6. Typical stepper motor driver application with NJM3772 V (+5V NJU39610 ...
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... External components The NJM3772 exhibits substantially less power dissipation than most other comparable stepper motor driver ICs on the market. This has been achieved by creating an external voltage drop in series with the upper transistor in the output H-bridge, see figure 3. The voltage drop reduces the collector-emitter saturation voltage of the internal transistor, which can greatly reduce power dissipation of the IC itself ...
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... It is not possible to use a motor that is rated for the same voltage as the actual supply voltage. Only rated current needs to be considered. Typical motors to be used together with the NJM3772 have a voltage rating while the supply voltage usually ranges from ...
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... The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. 75 100 125 150 2 NJM3772 0.68 B .60 .80 1.0 1.2 (A) ...