MCT8316AV datasheet(70/179 Pages) TI

70 / 179 page

Phase A

Voltage

FG_DIV_FACTOR = 0000b

(Commuta on cycle)

FG_DIV_FACTOR = 0001b

(Elec cycle)

FG_DIV_FACTOR = 0011b

(Elec cycle*3)

FG_DIV_FACTOR = 0100b

(Elec cycle*4)

FG_DIV_FACTOR = 0010b

(Elec cycle*2)

Figure 8-45. FG Frequency Divider

8.3.20.2 FG Open-Loop and Lock Behavior

During closed loop operation, the driving speed (FG output frequency) and the actual motor speed are

synchronized. During open-loop operation, however, FG may not reflect the actual motor speed. During motor-

lock condition, the FG output is driven high.

The MCT8316A provides three options for controlling the FG output during open loop, as shown in Figure 8-46.

The selection of these options is configured through FG_SEL.

If FG_SEL is set to,

• 00b: When in open loop, the FG output is based on the driving frequency.

• 01b: When in open loop, the FG output will be driven high.

• 10b: The FG output will reflect the driving frequency during open loop operation in the first motor start-up

cycle after power-on, sleep/standby; FG will be held high during open loop operation in subsequent start-up

cycles.

MCT8316A

SLLSFH8A – AUGUST 2021 – REVISED DECEMBER 2021

www.ti.com

Submit Document Feedback

Product Folder Links: MCT8316A

MCT8316AV Datasheet(PDF) 70 Page - Texas Instruments