BA6901F

Motor driver ICs

9/10

2) Power dissipation

Power consumption (PC) of BA6901F is calculated to the following equation.

Pc = Pc1 + Pc2 + Pc3

(1) Pc1 : Power consumption by circuit current

(2) Pc2 : Power consumption of output terminal

× Io

VOH is H voltage of output (A1 or A2).

Io can be decreased by using the transistor of high hFE rank and it is effective to consumption

electric power reduction.

(3) Pc3 : Power consumption of HO, AL and ALB terminal

Pc3 = VHO

× IHO + VAL × IAL + VALB × IALB

VHO is L voltage of Hall signal output (HO).

VAL and VALB are L voltage of lock detection output (AL or ALB).

IHO, IAL and IALB are current of HO, AL or ALB.

Please care to the terminal design not to exceed the allowable power dissipation.

3) Hall signal input terminal (H

+, H−)

Hall Amp input bias voltage

GND

Hall Amp input current =

R1 + R2 + RH

RH : Impedance of Hall element

R1

R2

RH

Hall element

H

−

H

+

C2

C1

Hall amp of BA6901F has input hysteresis

(

±10mV : Typ.)

Please adjust hall Amp input bias voltage by value of R1, R2 so that hall signal contains amplitude, input within range

0V

In the case of long board wiring pattern from hall element to hall signal input terminal, please connect capacitor C2 like

above figure.

4) GND

Please keep up the voltage of GND less than the voltage of another terminal surely.

5) This product is produced with strict quality control, but destroyed in using beyond absolute maximum ratings.

Once IC destroyed, a failure mode cannot be defined (like short-mode or open-mode). Therefore, physical security

counter measure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is

considered.