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ML4425CS 数据表(PDF) 3 Page - Micro Linear Corporation |
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ML4425CS 数据表(HTML) 3 Page - Micro Linear Corporation |
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3 / 16 page  3 ML4425 PIN NAME FUNCTION 1(30) ISENSE Motor current sense input. When ISENSE exceeds 0.2 ´ ILIMIT, the output drivers LA, LB, and LC are shut off for a fixed time determined by CIOS 2(31) HA Active low output driver for the phase A high-side switch 3(32) HB Active low output driver for the phase B high-side switch 4(1) HC Active low output driver for the phase C high-side switch 5(3) SPEED COMP Speed control loop compensation is set by a series resistor and capacitor from SPEED COMP to GND 6(4) CT A capacitor from CT to GND sets the PWM oscillator frequency 7(5) VREF 6.9V reference voltage output 8(6) SPEED SET Speed loop input which ranges from 0 (stopped) to VREF (maximum speed) 9(7) LA Active high output driver for the phase A low-side switch 10(8) LB Active high output driver for the phase B low-side switch 11(9) LC Active high output driver for the phase C low-side switch 12(10) ILIMIT Voltage on this pin sets the ISENSE threshold voltage at 0.2 ´ ILIMIT, leaving this pin unconnected selects an internally set threshold 13(11) VCO/TACH This TTL level output corresponds to the signal used to clock the commutation state machine. The output frequency is proportional to the motor speed when the back- EMF sensing loop is locked onto the rotor position 14(12) VDD 12V power supply input 15(15) CVCO A capacitor to GND sets the voltage-to-frequency ratio of the VCO 16(16) RVCO An resistor to GND sets up a current proportional to the input voltage of the VCO PIN NAME FUNCTION 17(17) CAT A capacitor to GND sets the time that the controller stays in the align mode 18(18) UV FAULT This output goes low when VDD drops below the UVLO threshold, and indicates that all output drivers have been disabled 19(19) CRT A capacitor to GND sets the time that the controller stays in the ramp mode 20(20) SPEED FB Output of the back-EMF sampling circuit and input to the VCO. An RC network connected to SPEED FB sets the compensation for the PLL loop formed by the back-EMF sampling circuit, the VCO, and the commutation state machine 21(21) CRR A capacitor to between CRR and SPEED FB sets the ramp rate (acceleration) of the motor when the controller is in ramp mode 22(22) FB A The motor feedback voltage from phase A is monitored through a resistor divider for back-EMF sensing at this pin 23(23) FB B The motor feedback voltage from phase B is monitored through a resistor divider for back-EMF sensing at this pin 24(24) FB C The motor feedback voltage from phase C is monitored through a resistor divider for back-EMF sensing at this pin 25(25) BRAKE A logic low input activates motor braking by shutting off the high- side output drivers and turning on the low-side output drivers 26(26) CIOS A capacitor to GND sets the time that the low-side output drivers remain off after ISENSE exceeds its threshold 27(27) RREF An 137k W resistor to GND sets a current proportional to VREF that is used to set all the internal bias currents except for the VCO 28(28) GND Signal and power ground PIN DESCRIPTION (Pin number in parenthesis is for TQFP package) |
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