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NJM3717 Datasheet(PDF) 3 Page - New Japan Radio |
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NJM3717 Datasheet(HTML) 3 Page - New Japan Radio |
3 / 10 page NJM3717 Figure 3. Definition of terms 50 % V CH t on t off V E | V – V | MA MB f = s ton toff + D = t ton off + 1 ton t t t d s 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 5. Three different current levels and zero current can be selected by the input logic. The circuit contains the following functional blocks: • Input logic • Current sense • Single-pulse generator • Output stage Input logic Phase input. The phase input determines the direction of the current in the motor winding. High input forces the current from terminal M A to MB and low input from terminal MB to MA. A Schmitt trigger provides noise immunity and a delay circuit eliminates the risk of cross conduction in the output stage during a phase shift. Half- and full-step operation is possible. Current level selection. The status of I 0 and I1 inputs determines the current level in the motor winding. Three fixed current levels can be selected according to the table below. Motor current I 0 I 1 High level 100% L L Medium level 60% H L Low level 20% L H Zero current 0% H H The specific values of the different current levels are determined by the reference voltage V R together with the value of the sensing resistor R S. The peak motor current can be calculated as follows: i m = (VR • 0.083) / RS [A], at 100% level i m = (VR • 0.050) / RS [A], at 60% level i m = (VR • 0.016) / RS [A], at 20% level The motor current can also be continuously varied by modulating the voltage reference input. |
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