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PDF BA6407AF Data sheet ( Hoja de datos )

Número de pieza BA6407AF
Descripción 2-phase half-wave motor driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA6407AF Hoja de datos, Descripción, Manual

Motor driver ICs
2-phase half-wave motor driver
BA6407AF
The BA6407AF is a motor driver dedicated to 12V fan motors. Built-in output transistors reduce the number of external
components required. The IC has a lock signal output pin.
FApplications
Fan motors
FFeatures
1) Lock detection and rotational speed sensing mecha-
nisms are built in.
2) Compact SOP 8-pin package reduces the number of
external components required.
3) Automatic restart when the motor lock is undone.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
700

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BA6407AF pdf
Motor driver ICs
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.
BA6407AF
The Hall current is given by:
VCC
R1)R2)RH
where RH is the hall device impedance.
Fig.3
(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 IO
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 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.
704

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