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BA6289F 数据表(PDF) 6 Page - Rohm |
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BA6289F 数据表(HTML) 6 Page - Rohm |
6 / 9 page 458 Motor driver ICs BA6289F / BA6417F (10) In-rush current There are no circuits built into these ICs that prevent in- rush currents. Therefore, it is recommended to place a current limiting resistor or other physical countermea- sure. (11) Factors regarding the thermal, power supply, and motor conditions If the potential of the output pin sways greatly and goes below the potential of ground, the operation of the IC may malfunction or be adversely affected. In such a case, place a diode between the output and ground, or other measure, to prevent this. (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 2) 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 10k Ω 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. (13) 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. (13) The input pins (pins 4 and 5 have temperature de- pendent characteristics. Take the temperature effect into consideration when using the IC. (14) To eliminate motor noise, connect a capacitor be- tween OUT1 (pin 1) and GND and between OUT2 (pin 7) and GND. Alternatively, connect a capacitor between OUT1 and OUT2, and also a diode between OUT1 and GND and between OUT2 and GND. |
类似说明 - BA6289F |
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