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ML4423CS 数据表(PDF) 3 Page - Micro Linear Corporation |
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ML4423CS 数据表(HTML) 3 Page - Micro Linear Corporation |
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3 / 10 page  ML4423 3 PIN DESCRIPTION PIN NAME FUNCTION 1 FB A Differential input which, in conjunction with FB C, feeds back the voltage applied across motor winding A-C. 2 FB C Input which feeds back the voltage applied to motor winding C. Reference voltage for windings A and B. 3 FB B Differential input which, in conjunction with FB C, feeds back the voltage applied across motor winding B-C. 4VMIN The voltage on this pin sets the minimum sinewave amplitude at low speeds. 5VSPEED The voltage on this pin sets the frequency and amplitude of the sinewaves generated at SINEA and SINEB. 6RSPEED An external resistor to ground provides a variable current to the sinewave generator. The current is proportional to VSPEED. 7VREF 8V reference output which can be used for setting VSPEED and VMIN. 8RREF An external resistor to ground provides a constant current used for setting the PWM frequency in conjunction with CT. 9RDT An external resistor to ground sets the deadtime in the output stage to prevent cross-conduction in the power devices. 10 SINE A-C A test output for observing the internally generated sinewave used for motor winding A-C. 11 SINE B-C A test output for observing the internally generated sinewave used for motor winding B-C. 12 CO An external capacitor to ground sets the sinewave frequency in conjunction with VSPEED and RSPEED. PIN NAME FUNCTION 13 CT An external capacitor to ground sets the PWM triangle frequency in conjunction with the external resistor RREF. 14 COAST A logic low input causes all output drive transistors to turn OFF. An internal pull-up drives COAST to VDD if left unconnected. 15 F/R A logic high input causes phase A to lead phase B, while a logic low input causes phase A to lag phase B. An internal pull-up drives F/R to VDD if left unconnected. 16 ISENSE Motor current sense input. 17 GND Signal and power ground. 18 3PH/2PH Leaving this pin unconnected selects 3-phase drive. Connecting this pin to VDD selects single/2-phase drive. 19 LB Low side drive output for phase B. 20 LC Low side drive output for phase C. 21 LA Low side drive output for phase A. 22 HB High side drive output for phase B. 23 HC High side drive output for phase C. 24 HA High side drive output for phase A. 25 5V/12V Input to select 5V or 12V output drive. SELECT Leaving this pin unconnected selects 5V output drive levels at the driver outputs. Connecting this pin to VCC selects 12V output drive levels at the driver outputs. 26 VDD 12V power supply input. 27 CGM1 An external capacitor to ground sets a pole in the feedback loop. 28 CGM2 An external capacitor to ground sets a pole in the feedback loop. |
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