出售LM621N全新原装现货：
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ‘‘shootthrough’’ current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
Description of Inputs and Outputs Pin 1: VCC1 (a5V). The logic and clock power supply pin. Pin 2: DIRECTION. This input determines the direction of rotation of the motor; ie., clockwise vs. counterclockwise. See truth table. Pin 3: DEAD-TIME ENABLE. This input enables or disables the dead-time feature. Connecting a5V to pin 3 enables dead-time, and grounding pin 3 disables it. Pin 3 should not be allowed to float. Pin 4: CLOCK TIMING. An RC network connected between this pin and ground sets the period of the clock oscillator, which determines the amount of dead-time. See Figure 2 and text. Pins 5 thru 7: HS1, HS2, and HS3 (Hall-sensor inputs). These inputs receive the rotor-position sensor inputs from the motor. Three-phase motors provide all three signals; four phase motors provide only two, one of which is connected to both HS2 and HS3. Pin 8: 30/60 SELECT. This input is used to select the required decoding for three-phase motors; ie, either ‘‘30-degree’’ (a5V) or ‘‘60-degree’’ (ground). Connect pin 8 to a5V when using a four-phase motor. Pin 9: LOGIC GROUND. Ground for the logic power supply
LM621N

LM621N

LM621N
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