Datasheet

5/10

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

www.rohm.com

11.Jul.2012 Rev.001

TSZ02201-0H1H0B100120-1-2

TSZ22111・15・001

BH6799FVM

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●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 Fig.9.

Fig.9 Lock protection timing chart

2) Soft switching function (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.

Fig.10 Relation between hall element output amplitude and output waveform

3) Hall input setting

Hall input voltage range is shown in operating conditions.

Fig.11 Hall input voltage range

Adjust the value of hall element bias resistor R1 in Fig.12 so that the input voltage of a hall amplifier is input in "hall

input voltage range" including signal amplitude.

(H+)-(H-)

OUT1

Vcc-1.1V

Vcc

GND

0.4V

H+

Toff

FG

Ton

Idling

Output Tr OFF

ON

Depends on hall signal.

(H in this figure)

Motor

locking

Lock

detection

Lock

release

Recovers

normal

operation

OUT2

OUT1