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BD6964FVM Datasheet(PDF) 5 Page - Rohm

Part # BD6964FVM
Description  Standard Single-phase Full wave Fan motor driver
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD6964FVM Datasheet(HTML) 5 Page - Rohm

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Datasheet
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© 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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