基于A4936设计的三相无刷DC马达驱动技术.doc
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1、基于A4936设计的三相无刷DC马达驱动技术A4936是Allegromicro公司的完整的三相无刷DC(BLDC)马达预驱动器,提供高达28V的输出,直接用来驱动六个功率N-MOSFET的大电流栅极。骑虎难下包括三个霍尔器件输入,用于换相控制的顺序器,PWM电流控制以及同步转子检测。本文介绍了A4936主要特性和优势,功能方框图和典型应用框图。The A4936 is a complete 3-phase brushless DC motor pre-driver, supplying up to 28 V output for direct, high-current gate drive
2、 of an all N-channel power MOSFET 3-phase bridge. The device has three Hall-element inputs, a sequencer for commutaTIon control, fixed off-TIme pulse width modulaTIon (PWM) current control, and locked-rotor detecTIon.Output current is scaled by the capability of the external MOSFETs. Locked rotor de
3、tection delay is set by an external capacitor on the CLD terminal. The PWM, DIR, and BRAKE and STOP inputs can be used to control motor speed, position, and torque. Motor speed can be determined using the FG output from an FG coil amplifier and comparator.The external MOSFETS can be PWMed using an e
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