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BA6288FS

Reversible motor driver

ROHM Semiconductor 

Motor driver ICs

BA6288FS

(12) HIGH level output voltage setting pin

The output voltage can be varied by controlling the Vref

voltage :

VOH=Vref)VBE (PNP)*VBE (NPN))(VOUT*Vref offset)

The voltage applied to the Vref pin should not exceed the

motor supply voltage (pin 4) or the VCC voltage. The Vref

input range over which the HIGH level output voltage can

be controlled according to the above equation is between

0V and (VCC * VSAT * VBE).

The output may oscillate if the Vref voltage is controlled by

a low-impedance circuit. Set the voltage by either provid-

ing an impedance of about 10kΩ or connecting a capaci-

tor between the Vref and GND pins. Because the optimum

impedance and capacitance values depend on such fac-

tors as the type of motor, the PCB pattern, and the load

current, the values must be determined separately for

each application.

(16) To eliminate motor noise, connect a capacitor be-

tween OUT1 (pin 3) and GND and between OUT2 (pin

14) and GND. Alternatively, connect a capacitor between

OUT1 and OUT2, and also a diode between OUT1 and

GND and between OUT2 and GND.

(13) Application circuit

Although the application circuit of Fig. 5 is recommend-

able, special care is required regarding the above pre-

cautions and parts characteristics when implementing

this application. Also, note that we have not carried out

extensive investigation of the patent right.

(14) Thermal shutdown circuit

When the thermal shutdown circuit is activated at the IC

junction temperature of about 175_C (typical), all driver

outputs are turned OFF. There is a temperature differ-

ence of about 15_C (typical) between the temperatures

at which the circuit is activated and deactivated.

(15) The input pins (pins 6 and 11) have temperature-

dependent characteristics. Take the temperature effect

into consideration when using the IC.

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