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PDF BA6809F Data sheet ( Hoja de datos )
| Número de pieza | BA6809F | |
| Descripción | 2-phase half-wave motor driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Motor driver ICs
2-phase half-wave motor driver
BA6809F / BA6819AF
The BA6809F and BA6819AF are motor drivers designed for 3V and 5V fan motors. Built-in output transistors reduce
the number of external components required. The ICs have an alarm output pin (BA6809F) and Hall output pin
(BA6819AF).
FApplications
Fan motors
FFeatures
1) Lock detection and rotational speed sensing mecha-
nisms are built in.
2) Alarm output pin (BA6809F) and Hall output pin
(BA6819AF).
3) Built-in thermal shutdown circuit.
4) Operation assured with a supply voltage as low as
2.7V.
5) Compact 8-pin SOP package.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
706
1 page  
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
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BA6809F.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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