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PDF BA6219B Data sheet ( Hoja de datos )

Número de pieza BA6219B
Descripción Reversible motor driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA6219B Hoja de datos, Descripción, Manual

Motor driver ICs
Reversible motor driver
BA6219B / BA6219BFP-Y
The BA6219B and BA6219BFP-Y are reversible-motor drivers suitable for brush motors. Two logic inputs allow four out-
put modes: forward, reverse, idling, and braking. The motor revolving speed can be set arbitrarily by controlling the volt-
age applied to the motor.
FApplications
VCRs and cassette tape recorders
FFeatures
1) Large output current. (IO=2.2A Max.)
2) Built-in thermal shutdown circuit.
3) Built-in output voltage setting pins.
4) Small standby supply current.
FBlock diagram
398

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BA6219B pdf
Motor driver ICs
FOperation notes
(1) A schematic for the internal circuit associated with
the output voltage setting pin (Pin 4) is shown in Fig. 7.
The maximum output voltage (VOMAX.) is given by :
VOMAX.=VCC1 * VSAT (Q1) * VBE (Q2) * VBE (Q3) * VBE (Q4)
For the condition of VR being equal to or less than
VOMAX., the relationship between the output voltage (VO)
and the pin 4 voltage is given by :
VO=VR ) {(VBE (Q5) ) VBE (Q6) ) VBE (Q7)) * (VBE (Q2) ) VBE
(Q3) ) VBE (Q4))}
Though VBE depends on the output power supply, VO is
nearly equal to VR.
BA6219B / BA6219BFP-Y
(1) When the output voltage control pin (pin 4) is used
VR < VCC1 * (VSAT (Q1) ) VBE (Q5) ) VBE (Q6) ) VBE (Q7)) VCC1
* 2.5V
VR < VCC2 * {(VSAT (Q3) * VBE (Q3) * VBE (Q2)) ) (VBE (Q5) )
VBE (Q6) ) VBE (Q7))} VCC2 * 1V
(2) Thermal shutdown circuit
The thermal shutdown circuit turns off the driver output
if the chip temperature rises to about 180_. The shut-
down signal is not latched.
(3) Power supply impedance
When the motor stops or starts, a rush current flows in the
VCC and GND lines. Depending on the way of connect-
ing a power supply decoupling capacitor (100µF), the
control input voltage may become a negative value or the
supply voltage may drop to below the output voltage.
This can cause erratic operations due to parasitic effects.
Make sure that pin voltages will not exceed the supply
voltage by more than 0.3V or will not become less than
the GND pin voltage by more than 0.3V.
(4) VCC1, VCC2, and VR are related to each other as
shown in the output circuit diagram of Fig. 8. Their values
should be kept within the following ranges.
Operating supply voltage ranges
(2) When the output voltage control pin (pin 4) is not
used, VR is either short-circuited to VCC1 or left OPEN.
(5) Input circuit
402

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