ML4411CS Microsemi Corporation, ML4411CS Datasheet
ML4411CS
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ML4411CS Summary of contents
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GENERAL DESCRIPTION The ML4411 provides complete commutation for delta or wye wound Brushless DC (BLDC) motors without the need for signals from Hall Effect Sensors. This IC senses the back EMF of the three motor windings (no neutral required) to ...
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ML4411/ML4411A PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 GND Signal and Power Ground 2 P1 Drives the external P-channel transistor driving motor PH1 3 P2 Drives the external P-channel transistor driving motor PH2 4 V 12V power and power ...
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ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Supply Voltage (pins 4, 25) ........................................ 14V Output Current ...
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ML4411/ML4411A ELECTRICAL CHARACTERISTICS PARAMETER Braking Circuit (V = 0V) PIN17 Brake Active Threshold PIN 26 Bias Current N-Channel Leakage C Current BRK Outputs ( 2.5V) CMD LIMIT I Low P V High P P3 Comparator Threshold V ...
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FUNCTIONAL DESCRIPTION The ML4411 provides closed-loop commutation for 3-phase brushless motors. To accomplish this task, a VCO, integrating Back-EMF Sampling error amplifier and sequencer form a phase-locked loop, locking the VCO to the back-EMF of the motor. The IC also ...
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Minute. ML4411/ML4411A The minimum VCO gain derived from the specification table (using the minimum Fvco at V VCO . VCO MIN ( ) C VCO Assuming that the V = 9.5V, then VCO(MAX ...
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STATE OFF ON A OFF OFF B OFF OFF C ON OFF D ON OFF E OFF ON F OFF ON RESET 4 VCO 2.3 V VCO OUT R 0 STATE Step 1a: ...
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ML4411/ML4411A The motor will start more consistently and tolerate a wider variation in open loop step rate if there is some damping on the motor (such as head drag) during the open loop modes. The tolerance of the open loop ...
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BRAKING As shown in figure 9, the braking circuit pulls the N- Channel MOSFET gates high when BRAKE falls below a 1.4V threshold. After a power failure, C slowly through R providing a delay for retract to occur DLY before ...
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ML4411/ML4411A APPLICATIONS Figure 10 shows a typical application of the ML4411 in a hard disk drive spindle control. Although the timing necessary to start the motor in most applications would be generated by a microcontroller, Fig. 11 shows a simple ...
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R1 ML4411 1/6 PIN 17 IC1 Figure 11. Analog Start-up Circuit – ML4411 + PIN +12V – SYMBOL VALUE SYMBOL A1 LM358 R4 IC1 74HC14 ...
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ML4411/ML4411A 10K 10K 10K +V +V 1.2K 0.01 0.5 In unipolar operation, the motor‘s windings must be allowed to drive freely to (MAX) SUPPLY (MAX) Therefore, there can be no diodes to clamp the inductive ...
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HIGHER VOLTAGE MOTOR DRIVE To drive a higher voltage motor, the same precautions regarding ML4411 voltage limitations as were outlined for Unipolar drive above should be followed. Figures 14–16 provide several methods of translating the ML4411‘s P outputs to drive ...
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... ORDERING INFORMATION PART NUMBER ML4411CS (Obsolete) ML4411ACS (End Of Life) © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; ...