BA6809F 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6809F

2-phase half-wave motor driver

ROHM Semiconductor 

Motor driver ICs

FOperation notes

(1) Thermal shutdown circuit

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

temperature difference of 20_C (typical) between the

temperatures at which the circuit is activated and deacti-

vated.

BA6809F / BA6819AF

(3) Hall amplifier input voltage

The circuit is activated at the temperature of about 175_C

(typical), so that all outputs are turned OFF. Normal op-

eration resumes when the circuit is deactivated.

(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 circuit current.

PC1=VCC ICC

PC2 is the output current consumption.

PC2=VOL IO

VOL is the LOW level output voltage of output pins

1 and 2, and IO is the sink current of pins 1 and 2.

PC3 is power consumed by the AL and HO pins.

PC3=VALL IAL (BA6809F)

PC3=VHOL IHO / 2 (BA6819AF)

where

VALL is the AL-pin LOW level voltage,

IAL is the AL-pin sink current,

VHOL is the HO-pin LOW level voltage,

IHO is the HO-pin sink current.

Make sure that your application does not exceed the al-

lowable power dissipation of the IC.

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

the Hall amplifier input bias voltage within the range of 0V

to (VCC*2V) including the signal amplitude.

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.

Hall current is given by=

VCC

R1)R2)RH

where RH is the Hall device impedance.

710

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