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ML4428CS Datasheet(PDF) 3 Page - Micro Linear Corporation |
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ML4428CS Datasheet(HTML) 3 Page - Micro Linear Corporation |
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3 / 16 page  3 ML4428 PIN DESCRIPTION 1ISNS Motor current sense input. Current limit one-shot is triggered when this pin is approximately 0.5V. 2 P1 Drives the external P-channel transistor driving motor PHI1. 3 P2 Drives the external P-channel transistor driving motor PHI2. 4 P3 Drives the external P-channel transistor driving motor PHI3. 5CSC The resistor/capacitor combination on this gm amplifier output sets a pole zero of the speed loop in conjunction with a gm of 0.230mmho. 6CPWM A capacitor to ground at this pin sets the PWM oscillator frequency. A 1nF capacitor will set the frequency to approximately 25kHz for PWM speed control. Grounding this pin selects linear speed control. 7VREF This voltage reference output (6V) can be used to set the speed reference voltage. 8VSPEED This voltage input to the amplifier in the speed loop controls the speed target of the motor. 9 N1 Drives the external N-channel MOSFETs for PHI1. 10 N2 Drives the external N-channel MOSFETs for PHI2. 11 N3 Drives the external N-channel MOSFETs for PHI3. 12 F/R The forward/reverse pin controls the sequence of the commutation states and thus the direction of motor rotation. (TTL level) 13 VCO This logic output indicates the commutation frequency of the motor in run mode. (TTL level) 14 VCC 12V power supply. 15 CVCO Timing capacitor for VCO 16 RVCO The resistor on this pin sets a process independent current to generate a repeatable VCO frequency. 17 CSNS This capacitor to ground sets the ON time of the 6 sense pulses used for position detection at start-up and at low speeds. A 5.6nF capacitor will set the on time to approximately 200µs. 18 VFLT A logic “0” indicates the power supply is under-voltage. (TTL level) 19 RINIT This resistor sets the minimum VCO frequency, and thus, the initial on time of the drive energization at start-up. A 2 Mý resistor to ground sets the minimum VCO frequency to approximately 10Hz, resulting in an initial drive energization pulse of 100ms in conjunction with 82nF CVCO and 10k RVCO. 20 RCVCO VCO loop filter components. 21 CISC A capacitor to ground at this gm amplifier output sets a pole in the current-mode portion of the speed loop in conjunction with a gm of 0.230mmho. 22 PHI1 Motor Terminal 1 23 PHI2 Motor Terminal 2 24 PHI3 Motor Terminal 3 25 BRAKE A ”0” activates the braking circuit. (TTL level) 26 CIOS A 50µA current from this pin will charge a timing capacitor to GND for fixed OFF-time PWM current control 27 RREF This resistor sets constant currents on the device to reduce process dependence and external components. A 120k resistor sets the previously mentioned current levels. 28 GND Signal and Power Ground PIN NAME FUNCTION PIN NAME FUNCTION |
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