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SLA7021 Scheda tecnica(PDF) 4 Page - Sanken electric |
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SLA7021 Scheda tecnica(HTML) 4 Page - Sanken electric |
4 / 10 page 17 SLA7024M, SLA7026M, SLA7027MU, SLA7022MU, SLA7029M, SMA7022MU, SMA7029M, SLA7020M, SLA7021M and SDK03M Fig. 1 Waveform of coil current (Phase A excitation ON) Fig. 3 Circuit for fixing the coil current Fig. 4 Circuit for fixing the coil current Fig. 5 Circuit for fixing the coil current Fig. 2 Circuit for fixing the coil current Application Note s Determining the output current Fig. 1 shows the waveform of the output current (motor coil current). The method of determining the peak value (lo) of the output current based on this waveform is shown below. <Parameters for determining the output current lo> Vb : Reference supply voltage r1, r2 : Voltage-divider resistors for the reference supply voltage Rs : Current detection resistor (1) Normal rotation mode lo is determined as follows when current flows at the maximum level during motor rotation. See Fig. 2, 3 and 4. r2 Vb lo = • ................................................... q r1+r2 Rs (2) Power down mode The circuits in Fig. 5, 6 and 7 (rx and Tr) are added in order to decrease the coil current. lo is then determined as follows. 1Vb IOPD = • ....................................... w r1(r2+rx)Rs 1+ r2•rx To determine rx, equation w can be modified to obtain equation e. 1 rx = .............................. e 1Vb 1 –1 – r1 Rs•lOPD r2 . . . . 0 Phase A Phase A IO SLA7022MU SLA7029M SMA7022MU SMA7029M SLA7020M SLA7021M RS C3 r2 r1 r6 r5 Vb(5V) 7,(9) 3,(13) SLA7024M SLA7026M SLA7027MU RS C3 r2 r1 r6 r5 Vb(5V) 9,(10) 3,(14) SDK03M RS C3 r2 r1 r6 r5 Vb(5V) 10 3 13 15 SLA7022MU SLA7029M SMA7022MU SMA7029M SLA7020M SLA7021M RS C3 r2 r1 r6 r5 Vb(5V) 7,(9) 3,(13) rX Tr Power down signal . . |
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