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M54671SP Datasheet(PDF) 3 Page - Mitsubishi Electric Semiconductor |
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M54671SP Datasheet(HTML) 3 Page - Mitsubishi Electric Semiconductor |
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3 / 5 page  2-PHASE STEPPER MOTOR DRIVER M54671SP MITSUBISHI <CONTROL / DRIVER IC> TYPICAL CHARACTERISTICS SWITCHING CHARACTERISTICS APPLICATION DESCRIPTION (1) PHASE INPUT Phase input decides the output mode. (2) VR (Comparative voltage) The current level can be continuously changed by changing the voltage at VR continuously. (3) Current sensor When the voltage fall at the current sensing resistor and the selected current level become of the same level, the comparator triggers monostable. Then the output stage is cut off for a certain time (TOFF). During this cutoff time, the current decreases slightly and falls short of the comparative level. After the cutoff time (TOFF), the output stage is in ON state again. This operation is repeated. (4) Single pulse generator At the comparator output rise edge, the monostable is triggered. The pulse width of the monostable at the external timing CT and RT is as follows. TOFF = 0.69 x CT x RT Retrigger during TOFF is neglected. (5) Analog control The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the comparator. PHASE H L MA H L MB L H TIMING CHART Switching waveforms VMA-VMB or VMB-VMA 1 1/2 TON TOFF TOFF = 0.69 x RT xCT VCH VE td 2-phase excitation Phase 1 Phase 2 1 50 60 70 80 40 30 20 10 0 2.5W 1.7W Ambient Temperature Ta ( °C) 2 3 θj-c = 25°C/W Free air ( θc-a = 48.5°C/W) 10cm2 aluminum heat sink ( θc-a = 25°C/W) Thermal |
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Similar Description - M54671SP |
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