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SI9979 Datasheet(PDF) 5 Page - Vishay Siliconix |
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SI9979 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 9 page Si9979 Vishay Siliconix Document Number: 70012 S-41209—Rev. E, 21-Jun-04 www.vishay.com 5 PIN DESCRIPTION (CONT’D) Pin 9: BRK With this input at logic “1”, the top MOSFETs are turned off and the bottom MOSFETs are turned on, shorting the motor windings together. This provides a braking torque which is dependent on the motor speed. This is the default condition as this pin is pulled up internally. When this pin is pulled to ground, the MOSFETs are allowed to follow the commutation sequence. Pin 10: TACH This output provides a minimum 300-nanosecond output pulse for every commutation sensor transition, yielding a 6 pulse per electrical revolution tachometer signal. This output is open drain. Pin 11: FAULT The FAULT output switches low to indicate that at least one of the following conditions exists, controller disable (EN), undervoltage lockout, invalid commutation sensor code shutdown, or overcurrent shutdown. This output is open drain. Pin 17: RT/CT The junction of the current limit one shot timing resistor and capacitor is connected to this pin. This one-shot is triggered by the current limit comparator when an overcurrent condition exists. This action turns off all the gate drives for the period defined by RT and CT, thus stopping the flow of current. Pin 18: RT One side of the current limit one shot timing resistor is connected to this pin. Pin 19: IS+ This is the sensing input of the current limit comparator and should be connected to the positive side of the current sense resistor. When the voltage across the current sense resistor exceeds 100 mV, the comparator switches and triggers the current limit one-shot. The one-shot turns off all the gate drives for the period defined by RT and CT, thus stopping the flow of current. If the overcurrent condition remains after the shutdown period, the gate drives will be held off until the overcurrent condition no longer exists. Pin 20: IS− This pin is the ground reference for the current limit comparator. It should be connected directly to the ground side of the current sense resistor to enhance noise immunity. Pins 12−16: 21−24, 37−41, 44−48, GND These pins are the return path for both the logic and gate drive circuits. Also, they serve to conduct heat out of the package, into the circuit board. Pin 25: GBC This is the gate drive output for the bottom MOSFET in Phase C. Pin 26: GTC This is the gate drive output for the top MOSFET in Phase C. Pin 27: SC This pin is negative supply of the high-side drive circuitry. As such, it is the connection for the negative side of the bootstrap capacitor, the top MOSFET Source, the bottom MOSFET Drain, and the Phase C output. Pin 28: CAPC This pin is the positive supply of the high-side circuitry. The bootstrap capacitor for Phase C is connected between this pin and SC. Pin 29: GBB This is the gate drive output for the bottom MOSFET in Phase B. Pin 30: GTB This is the gate drive output for the top MOSFET in Phase B. Pin 31: SB This pin is negative supply of the high-side drive circuitry. As such, it is the connection for the negative side of the bootstrap capacitor, the top MOSFET Source, the bottom MOSFET Drain, and the Phase B output. Pin 32: CAPB This pin is the positive supply of the high-side circuitry. The bootstrap capacitor for Phase B is connected between this pin and SB. Pin 33: GBA This is the gate drive output for the bottom MOSFET in Phase A. |
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Descripción similar - SI9979_04 |
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