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UC1633 데이터시트(PDF) 7 Page - Texas Instruments |
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UC1633 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 8 page Design Example UC1633 UC2633 UC3633 Bode Plots - Design Example Open Loop Response 1.) KLF(s) • KRF(s) 2.*) N • Kφ • GPD • KT s 2 • J 3.) Combined Overall Open Loop Response Where: KLF(s) = Loop Filter Response KRF(s) = Reference Filter Response N = 4 (Using Double Edge Sensing With 4 Pole Motor) K φ = Phase Detector Gain (.4V/RAD) GPD = Power Stage Transductance (1A/V) KT = Motor Torque Constant (.022NM/A) J = Motor Moment of Inertia (.0015NM/A - SEC 2) s = 2 πjf *Note: For a current mode driver the electrical time constant, LM / RM, of the motor does not enter into the small signal response. If a voltage mode drive scheme is used, then the asymptote, plotted as 2 above, can be approximated by: N • K φ • KPD • KT s 2 • J • RM if: RM > KT √LM J and, KT 2 2 π • J • RM < f < RM 2 π • LM Here: KPD = Voltage gain of Driver Stage RM = Motor Winding Resistance LM = Motor Winding Inductance APPLICATION AND OPERATION INFORMATION UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 7 |
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