SLLSFS3 May 2024 MCT8316A-Q1
PRODUCTION DATA
To achieve the best efficiency, it is often desirable to control the drive state of the motor so that the motor phase current is aligned with the motor BEMF voltage. MCT8316A-Q1 provides the option to advance or delay the phase voltage from the commutation point by adjusting the lead angle. The lead angle can be adjusted to obtain optimal efficiency. This can be accomplished by operating the motor at constant speed and load conditions and adjusting the lead angle (LD_ANGLE) until the minimum current is achieved. The MCT8316A-Q1 has the capability to apply both positive and negative lead angle (by configuring LD_ANGLE_POLARITY) as shown in Figure 6-29
Lead angle can be calculated by {LD_ANGLE x 0.12}o; for example, if the LD_ANGLE is 0x1E and LD_ANGLE_POLARITY is 1b, then a lead angle of +3.6o(advance) is applied. If LD_ANGLE_POLARITY is 0b, then a lead angle of -3.6o(delay) is applied.
For 120o commutation, the negative lead angle is limited to -20o; any lead angle lower than that will be clamped to -20o.
For variable commutation, negative lead angle is not supported and positive lead angle is limited to +15o. Anything configured higher than +15o or lower than 00 will be clamped to 15o and 0o respectively.