TB67H450FNG Constant current PWM blanking time In TB67H450FNG, the following blanking time is set to prevent a spike current and external noise which are generated during driving a motor. (1) tBLK (2) NFth Charge Fast Slow The timing charts or constants may be omitted or simplified for explanatory. tBLK (For preventing incorrect detection of a spike current at changing from Decay to Charge): 3.6 μs (typ.): (1) The blanking time, 400 ns (typ.) is also set for preventing an incorrect detection around setting current value (NFth).: (2) * The time widths shown in the above figure are the design values, and the values are not guaranteed. Blanking time between Input signal and tBLK The tBLK is intended to avoid inrush current detection. The TB67H450FNG not only can be controlled by constant current PWM, but also by direct PWM; with IN control signals. Therefore the tBLK is set at each IN switch timing; shown with gray in the timing chart below. IN1IN2Iout Timing charts may be simplified for explanatory purposes. 7 2019-04-01
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