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NJM3775 Datasheet(PDF) 6 Page - New Japan Radio |
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NJM3775 Datasheet(HTML) 6 Page - New Japan Radio |
6 / 10 page NJM3775 s APPLICATIONS INFORMATION Current control The regulated output current level to the motor winding is determined by the voltage at the reference input and the value of the sensing resistor, R S. The peak current through the sensing resistor (and the motor winding) can be expressed as: I M,peak = 0.1•VR / RS [A] With a recommended value of 0.5 ohm for the sensing resistor R S, a 2.5 V reference voltage will produce an output current of approximately 500 mA. R S should be selected for maximum motor current. Be sure not to exceed the absolute maximum output current which is 850 mA. Chopping frequency, winding inductance and supply voltage also affect the current, but to much less extent. For accurate current regulation, the sensing resistor should be a 0.5 -1.0 W precision resistor, i. e. less than 1% tolerance and low temperature - coefficient. Figure 7. Half stepping system where NJM3517 is used as controller circuit in order to generate the necessary sequence to the NJM3775. NJM 3517 HSM GND 3 2 4 11 10 7 6 16 9 8 fl fl P P DIR STEP INH Half/Full Step Direction Step V CC + V (+5 V) GND (V ) B A A1 B1 4.7 µF CC CC 4 x 10 k Ω 12 k Ω 4 700 pF Phase Dis V Phase Dis V 1 1 2 2 R1 R2 E C E C GND RC NJM3775 M M M M A1 B1 A2 B2 V CC VV MM1 MM2 3 1 20 22 9 10 7 12 4 19 11 5, 6, 17, 18 215 21 8 11 2 2 R S R S 14 13 16 STEPPER MOTOR V MM Pin numbers refer to DIP package. + 10 µF GND (V ) 0.1 µF MM 1.0 Ω 1.0 Ω 0.1 µ F Figure 6. Typical stepper motor driver application with NJM3775. Phase Dis V Phase Dis V 1 1 2 2 R1 R2 E C E C GND RC NJM3775 12 k Ω 4 700 pF 0.47 Ω 0.47 Ω M M M M A1 B1 A2 B2 V CC VV MM1 MM2 +5 V +5 V 3 1 20 22 9 10 7 12 4 19 11 5, 6, 17, 18 215 21 8 11 2 2 R S R S 14 13 16 STEPPER MOTOR V MM Pin numbers refer to DIP package. + 10 µF 0.1 µF GND (V ) GND (V ) 0.1 µF MM CC |
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