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BD7931F Datasheet(PDF) 5 Page - Rohm |
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BD7931F Datasheet(HTML) 5 Page - Rohm |
5 / 9 page BH6578FVM,BD7931F Technical Note 5/8 www.rohm.com 2011.05 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. ● Interfaces BH6578FVM BD7931F Fig.14 Fig.17 Fig.15 Fig.16 Fig.18 Fig.19 ● Operations (1) CONTROL LOGIC Operation of each mode is carried out as follows: When INFWD is “H” and INREV is “L,” the normal rotation mode is achieved and current flows from OUT + to OUT-. When both INFWD and INREV are “H,” the brake mode is achieved. Operation in such event is described as follows: the top-side transistor turns OFF to stop supplying motor drive current, the bottom-side transistor turns ON to absorb reverse EMF of motor and applies brake to motor. When both INFWD and INREV are “L,” OUT + and OUT- potentials become open and the motor stops. (2) LOADING CONT Controlling the output voltage can vary voltage applied to the motor and can control the motor speed. By the voltage entered to the CONT terminal, the output H voltage can be controlled (gain 6dB Typ.). Even if the voltage entered is increased more than necessary (Vcc Max), the output voltage never exceeds the power supply voltage. LDCONT OUT+/OUT- FIN/RIN LDCONT OUT+/OUT- INFWD/INREV 50KΩ 50KΩ 200KΩ 7 8 50KΩ 50KΩ 50KΩ 50KΩ 200KΩ 7 8 VCC VCC 6 10KΩ 49.6KΩ VCC 6 39KΩ 10KΩ 2 3 VCC 2 3 VCC |
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