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BD6982FVM

www.rohm.com

TSZ02201-0H1H0B100540-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

20.May 2015 Rev.003

TSZ22111・15・001

Description of Operations

1) Lock Protection and Automatic Restart

digital counter based on internal oscillator. Therefore the ratio of ON/OFF time is always constant. Timing chart is

shown in Figure 11.

Figure 11. 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. Gain of 55dB (560 times) is provided between input and output,

therefore enter an appropriate hall element output to IC where output waveform swings sufficiently.

Figure 12. Relation between Hall Element Output Amplitude and Output Waveform

(H+)-(H-)

OUT1

H+

AL

Idling

OutputTr OFF

ON

Motor

locking

Lock

detection

Lock

release

Recovers

normal

operation

OUT1

OUT2