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| Motor driver ICs 3-phase motor driver for VCR cylinders BA6467FP-Y The BA6467FP-Y is a motor driver developed for cylinders. It contains a power supply with a constant voltage 8V, and a start / stop pin that opens the output. FApplications VCR cylinders FFeatures 1) 3-phase, full-wave, pseudo-linear drive system. 2) Internal constant voltage power supply (8V). 3) Internal thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 754 Motor driver ICs FBlock diagram BA6467FP-Y 755 Motor driver ICs FPin descriptions BA6467FP-Y 756 Motor driver ICs FInput / output circuits (1) Start / stop (ST / SP: pin 9) BA6467FP-Y (2) Torque limit (TL: pin20) (3) Torque control input (EC: pin19, ECR: pin 18) (4) Coil output (A1: pin 6, A2: pin4, A3: pin 3) (5) Hall input (H1): pin10, H1-: pin 11, H2): pin 12, H2-: pin 13, H3): pin 14, H3-: pin 15) 757 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V) BA6467FP-Y 758 Motor driver ICs FCircuit operation (1) Hall I / O The 3-phase Hall signal is amplified in the hall amplifiers and sent to the matrix circuit, where the signal is further amplified and combined. After the signal is converted to a current in the amplitude control circuit, the current is supplied to the output driver, which then provides a motor drive current. The phases of the Hall input signal, output voltage, and output current are shown in Fig.1. BA6467FP-Y (2) Torque control pin The output current can be controlled by adjusting the voltage applied to the torque control pin. (3) Start / stop pin The motor is in the run mode when the pin input voltage is 3.5V or more and in the standby mode (all output transistors are off) when the voltage is 1.2V or less. (4) Power ground pin (RNF pin) The power ground pin is the output stage ground pin. Connect a resistor (0.5 recommended) between this pin and the ground to monitor the output current. (5) Phase compensation pin (CNF pin) Connect a capacitor between this pin and VCC if the output tends to oscillate. 759 Motor driver ICs FApplication example BA6467FP-Y 760 Motor driver ICs FOperation notes (1) Start / stop pin The I / O equivalent circuit of the start / stop pin is shown in Fig.4. The pin has a temperature dependence of *7mV / _C, and its resistance can vary 30%. The voltage on this pin should be less than VREG. BA6467FP-Y (3) Torque limit pin The output current can be limited by applying a voltage to the torque limit pin. Control is provided so that this pin will have the same potential as the power ground pin (RNF). Note that there is a voltage offset on this pin. The RNFpin voltage is 0.325V when the TL-pin voltage is 0.4V (typical) and the RNF-pin resistance is 0.5. Note that the voltage offset changes with RNF-pin resistance. Connect the TL pin to VREG (pin 23) when the TL pin is not used. (2) Hall input The input circuit of the Hall input pins is shown in Fig.5. The Hall devices can be connected in either series or parallel. The input Hall signal should be within the range of the Hall input common-mode voltage. (4) Thermal shutdown circuit (TSD) The thermal shutdown circuit puts the coil outputs (A1, A2, and A3) to the open state at the temperature of 175_C (typical). There is an approximate 25_C temperature hysteresis. 761 Motor driver ICs FElectrical characteristic curves BA6467FP-Y FExternal dimensions (Units: mm) 762 |
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