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BD6964FVM Datasheet(PDF) 5 Page - Rohm |
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BD6964FVM Datasheet(HTML) 5 Page - Rohm |
5 / 17 page Datasheet 5/13 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com 20.May.2014 Rev.002 TSZ02201-0H1H0B100260-1-2 TSZ22111・15・001 BD6964FVM Description of Operations 1) Lock Protection and Automatic Restart Circuit Motor rotation is detected by hall signal, and lock detection ON time (tON) and lock detection OFF time (tOFF) are set by IC internal counter. External part (C or R) is not required. Timing chart is shown in Figure 13. Figure 13. Lock Protection Timing Chart 2) Soft Switching (silent drive setting) Input signal to hall amplifier is amplified to produce an output signal. When the hall element output signal is small, the gradient of switching of output waveform is gentle; When it is large, the gradient of switching of output waveform is steep. Enter an appropriate hall element output to IC where output waveform swings sufficiently. Figure 14. Relation between Hall Element Output Amplitude and Output Waveform 3) Hall Input Setting Hall input voltage range is shown in operating conditions. Figure 15. Hall Input Voltage Range Adjust the value of hall element bias resistor R1 in Figure 16 so that the input voltage of a hall amplifier is input in "Hall Input Voltage Range" including signal amplitude. (H+)-(H-) OUT1 Hall input voltage range upper limit Vcc GND Hall input voltage range lower limit H+ tOFF tON Idling Output Tr OFF ON Motor locking Lock detection Lock release Recovers normal operation OUT2 AL Hi(open collector) OUT1 |
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