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SI-7330 bảng dữ liệu(PDF) 3 Page - Sanken electric |
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3 / 5 page 31 SI-7300 and SI-7330A Application Note s Determining the output current IO (motor coil current) The output current, lo is fixed by the following circuit ele- ments: RS : Current detection resistor VCC2 : Supply voltage RX : Variable current resistor To operate a motor at maximum current level, set Rx = infinity (open). Based on the specifications of SI-7300A, its output current lo can be seen as: lo (rms value): 535 to 625 mA To compute lo when different values are used for Rs and VCC2, use the approximation formula below. The maximum ripple value IOH of the output current waveform can be computed as follows: 1 lOH(max) = (0.233•VCC2–0.026) [A] RS 1 lOH(min) = (0.214•VCC2–0.021) [A] RS The graph of this equation is shown below. . . . . s Power down mode The SI-7300A can be operated in power down mode. The circuit is shown below. When transistor Tr is switched on, the reference voltage drops and the output current can be decreased. Waveform of output current IOH Rx Tr 2 SI-7300A SI-7300A Pull-out torque τout vs. Response frequency 500 1000 5000 0 1 2 3 4 5 Motor 23PM-C108 VCC1=30V IO=1.2A/ (Fixed) 2-phase excitation VZ=60V Response frequency f (pps) φ s Example of a Frequency vs. Torque characteristic The graph shows the relation- ship between frequency and pull-out torque of SI-7300A. 4 3 2 01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 4 3 2 01 0 1 2 3 SI-7300A Output current IOH vs. Current detection resistor Rs Current detection resistor Rs ( Ω) SI-7330A Output current IOH vs. Current detection resistor Rs max V CC2=5V min V CC2=5V IOH(max) 1 Rs (0.233VCC2–0.026) IOH(min) 1 Rs (0.214VCC2–0.021) Current detection resistor Rs ( Ω) 4 3 2 01 0 1 2 3 Variable current resistor Rx (k Ω) 4 3 2 01 0 0.2 1.0 1.6 Variable current resistor Rx (k Ω) 1.4 1.2 0.8 0.4 0.6 SI-7300A Output current IOH vs. Variable current resistor RX max Rs = 0.7 Ω min max Rs = 1Ω min SI-7330A Output current IOH vs. Variable current resistor RX Rs = 0.3 Ω Rs = 0.8Ω IOH(max) 1 Rs 1.131 4.843+ 4.9 Rx VCC2 – 0.026 IOH(min) 1 Rs 1.107 5.165+ 5.1 Rx VCC2 – 0.021 *Rx : kΩ |
Số phần tương tự - SI-7330 |
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Mô tả tương tự - SI-7330 |
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