BA6407AF datasheet(5/6 Pages) ROHM

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704

Motor driver ICs

BA6407AF

FOperation notes

(1)

Thermal shutdown circuit

The IC has a built-in thermal shutdown circuit. There is

a temperature difference of 25

_C (typical) between the

temperatures at which the circuit is activated and deacti-

vated.

(2)

Power dissipation

Power consumed in the IC can be calculated from the fol-

lowing equation :

PC=PC1

)PC2)PC3

PC1 is power consumed by the supply current.

PC1=VCC

ICC

PC2 is the output current consumption.

PC2=VOL

VOL is the LOW level voltage of output pins 1 and 2.

PC3 is power consumed by the AL pin.

PC3=VALL

IAL

where VALL is the AL-pin LOW level voltage and IAL is the

AL-pin sink current. Make sure that your application does

not exceed the allowable power dissipation of the IC.

(3)

Hall amplifier input voltage

The Hall current is given by:

where RH is the hall device impedance.

The R1 and R2 resistances must be set so as to maintain

the Hall amplifier input bias voltage within the range of 1V

to (VCC

*2V) including the signal amplitude. It is recom-

mended that the same value be used for both resistors

so that the Hall device output signal is centered around

VCC /2.

The Hall device may be affected by power supply noise

due to the PCB conductor pattern. If you have this prob-

lem, insert a capacitor C1 as shown in Fig. 5.

If the conductor lines from the Hall device output termi-

nals to the Hall inputs of the IC are particularly long, noise

can be picked up and fed into the inputs. If you have this

problem, insert a capacitor C2 as shown in Fig. 5. Note

that the Hall inputs have no hysteresis in this IC.

Fig.3

)R2)RH

VCC

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