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AN2839 bảng dữ liệu(PDF) 3 Page - STMicroelectronics |
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AN2839 bảng dữ liệu(HTML) 3 Page - STMicroelectronics |
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3 / 40 page ![]() AN2839 List of figures Doc ID 15104 Rev 1 3/40 List of figures Figure 1. L6228 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Supply voltage of high-side gate drivers versus supply voltage . . . . . . . . . . . . . . . . . . . . . . 4 Figure 3. Currents and voltages during the dead time at the beginning of the off time . . . . . . . . . . . . 5 Figure 4. Voltage at the two outputs at the beginning of the off-time. . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 5. Typical application and layout suggestions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 6. Two situations that must be avoided . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 7. Charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 8. Sharing the charge-pump circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 9. Obtaining a variable voltage through a PWM output of a µC . . . . . . . . . . . . . . . . . . . . . . 12 Figure 10. Logic input pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 11. EN input pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 12. Simplified schematic of the PWM current controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 13. Output current regulation waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 14. Typical off time vs. COFF for several values of ROFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 15. Minimum on time vs. COFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 16. Fast decay mode output stage configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 17. Slow decay mode output stage configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 18. PWM controller loses the current regulation due to minimum on time . . . . . . . . . . . . . . . . 18 Figure 19. PWM controller loses the current regulation due to minimum on time - detail . . . . . . . . . . 18 Figure 20. Simplified circuitry of the overcurrent detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 21. Overcurrent operation: timing 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 22. Overcurrent operation: timing 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 23. Typical disable time vs. CEN for several values of REN . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 24. Typical delay time vs. CEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 25. IC dissipated power versus output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 26. Maximum output current vs. selectable devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 27. Power dissipation and thermal analysis with PractiSPINTM software . . . . . . . . . . . . . . . . . 24 Figure 28. Torque instability in full-step mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 29. Balanced half step for low torque ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 30. Realizing half-step current shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 31. Microstepping application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 32. Microstepping reference voltages, output currents and CLOCK signal . . . . . . . . . . . . . . 27 Figure 33. Using fast decay during a high, negative current slope . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 34. Application example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 35. PractiSPINTM PC software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Figure 36. PractiSPINTM ST7 demonstration board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 37. EVAL6208N electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 38. EVAL6228QR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Figure 39. EVAL6228QR component placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 40. EVAL6228QR top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Figure 41. EVAL6228QR bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Figure 42. EVAL6228QR electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 |
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