LM621N ,LM621 Brushless Motor CommutatorLM621BrushlessMotorCommutatorAugust1992LM621BrushlessMotorCommutatorYOutputs drive bipolar power de ..
LM6221N ,High Speed BufferApplicationsn Line Drivingn Radarn SonarSimplified SchematicDS009223-1Numbers in ( ) are for 8-pin ..
LM6225N ,High Speed BufferLM6125/LM6225/LM6325 High Speed BufferDecember 1994LM6125/LM6225/LM6325High Speed Buffern High outp ..
LM6261M ,High Speed Operational AmplifierElectrical Characteristics (Continued)= = =The following specifications apply for Supply Voltage ±1 ..
LM6261N ,High Speed Operational AmplifierLM6161/LM6261/LM6361 High Speed Operational AmplifierMay 1999LM6161/LM6261/LM6361High Speed Operati ..
LM6261N ,High Speed Operational AmplifierElectrical Characteristics= = =The following specifications apply for Supply Voltage ±15V, V 0, R ≥ ..
LP3873ES-2.5/NOPB ,3A Fast Ultra Low Dropout Linear Regulator 5-DDPAK/TO-263 -40 to 125Electrical Characteristics. The ensured specifications apply only for the test conditions listed. S ..
LP3873ES-5.0 ,3A Fast Ultra Low Dropout Linear Regulator
LP3873ES-5.0 ,3A Fast Ultra Low Dropout Linear Regulator
LP3873ES-5.0/NOPB ,3A Fast Ultra Low Dropout Linear Regulator 5-DDPAK/TO-263 -40 to 125*SD pins must be pulled high through a 10kΩ pull-up resistor. See Application Hints for more inform ..
LP3873ESX-1.8 ,3A Fast Ultra Low Dropout Linear Regulator
LP3873ESX-5.0/NOPB ,3A Fast Ultra Low Dropout Linear Regulator 5-DDPAK/TO-263 -40 to 125Maximum RatingsStorage Temperature Range−65°C to +150°CLead Temperature Soldering, 5 sec. 260°C(3)E ..
LM621N
LM621 Brushless Motor Commutator
TL/H/8679
LM621
Brushless
Motor
Commutator
August 1992
LM621 Brushless Motor Commutator
General Description
The LM621isa bipolarIC designedfor commutationof
brushlessDC motors. The partis compatible with both
three-and four-phase motors.It candirectly drivethe power
switching devices usedto drivethe motor.The LM621pro-
videsan adjustable dead-time circuitto eliminate ‘‘shoot-
through’’ current spikinginthe power switching circuitry.
Operationis froma5V supply,but output swingsofupto
40Vare accommodated.Thepartis packagedinan 18-pin,
dual-in-line package.
Features Adjustable dead-time feature eliminates current spiking On-chip clock oscillatorfor dead-time feature Outputs drive bipolar power devices(upto35mA base
current)or MOSFET power devices Compatible with three- and four-phase motors... Bipolar driveto delta-or Y-wound motors Unipolar driveto center-tapped Y-wound motors Supports 30- and 60-degree shaft position sensor
placementsfor three-phase motors Supports 90-degree sensor placementfor four-phase
motors Directly interfacesto pulse-width modulator output(s)
via OUTPUT INHIBIT (PWM magnitude) and DIREC-
TION (PWM sign) inputs Direct interfacetoHall sensors Outputsare current limited Undervoltage lockout
Connection Diagram
TL/H/8679–1
Order Number LM621N
SeeNS PackageNumberN18A
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
