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A4923 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A4923 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 11 page 3-Phase Sinusoidal Motor Controller A4923 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com The internal sine modulation signal is converted to a PWM signal to drive the motor terminals. A 20 kHz carrier is modulated with the current sine profile value and used to generate the gate drive signals. Thus, the motor terminal voltage is a 20 kHz PWM sig- nal with a duty cycle dependent upon the sine modulation signal. The high- and low-side gate drivers on a given motor terminal are enabled inverted of the other, with a dead-time added to ensure both drivers will never be enabled at the same time. For increased efficiency, torque ripple, and audible noise, the sine profile is advanced 7.5º of one electrical revolution, relative to the hall transitions. 64 Steps 64 Steps 64 Steps 6 Bits of Resolution One Electrical Revolution Sx + VCP Sx VREG7.2 0 VBB 0 Sine Drive Modulation Signal High-side Gate Drive Low-side Gate Drive Motor Terminal Voltage Figure 2: Sine Modulation Signal |
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