Datasheet TB9053FTG,TB9054FTG - Preliminary (Toshiba) - 10

Preliminary
TB9053FTG,TB9054FTG
5.3. Current-limit control
This IC adopts a chopper-type current-limit control. When an event such as transient pulses due to high-speed throttle operation or a locked motor due to an immovable motor shaft causes a large current, the IC activates the current-limit control to protect the actuator and reduce the power dissipation. (An additional over-current protection circuit prepared in another block deals with a short-circuit to power supply or ground.) The current-limit comparator is located on the low side. Higher threshold is defined as Ilim-H, and lower as Ilim-L. The Lo-side performs regeneration (Slow Decay). A blanking time is set internally after which a current-limit control is activated. Ilim-H = 6.5 A (typ.) and Ilim-L = Ilim-H - 0.25 A (typ.) Two current-limit thresholds are selectable for 16 combinations by SPI registers as following table. Ch1 (OUT1/OUT2) Ch2 (OUT3/OUT4) Ilim-H Ilim-L Ilim-H Ilim-L 6.5 A - 0.25 A 6.5 A - 0.25 A 6.5 A (Initial value) 6.5 A (Initial value) (Initial value) (Initial value) 6.5 A - 0.5 A 6.5 A - 0.5 A 4.6 A - 0.25 A 6.5 A - 0.25 A 4.6 A (Initial value) 6.5 A (Initial value) 2-channel mode (Initial value) (to drive two motors) 4.6 A - 0.5 A 6.5 A - 0.5 A 6.5 A - 0.25 A 4.6 A - 0.25 A 6.5 A (Initial value) (Initial value) (Initial value) 4.6 A 6.5 A - 0.5 A 4.6 A - 0.5 A 4.6 A - 0.25 A 4.6 A - 0.25 A 4.6 A (Initial value) 4.6 A (Initial value) 4.6 A - 0.5 A 4.6 A - 0.5 A In combined 2-channel mode, the following 4 combinations are selectable. Ch1 (OUT1/OUT2), Ch2 (OUT3/OUT4) Total Ilim-H Ilim-L Ilim-H Ilim-L 6.5 A - 0.25 A 13 A 6.5 A - 0.5 A 6.5 A Combined 2-channel (Initial value) (Initial value) (Initial value) (Initial value) mode 6.5 A - 0.5 A 6.5 A - 1.0 A (to drive one motor) 4.6 A - 0.25 A 9.2 A 4.6 A - 0.5 A 4.6 A (Initial value) (Initial value) 4.6 A - 0.5 A 4.6 A - 1.0 A © 20 20 10 2020-12-10 Toshiba Electronic Devices & Storage Corporation