UC3620 open loop driver example

UC3620 and UC3623 are high-
performance, chopper servo drive integrated circuits that directly drive three-phase brushless DC motors. It includes all necessary circuits such as position signal decoding, current comparison,
oscillator, high-gain operational amplifier, drive output and several protection circuits . Since its output dvldt is limited to less than 150V/belly
under any load condition , conducted or radiated radio interference is significantly reduced, so it is more suitable for situations that require strict restrictions on interference noise. Except for the different output current capabilities , the two circuits have the same functions and pins. Figure 3-24 shows the internal block diagram and connection circuit example of open-loop control .