LSI/CSI LS7362C-S

The LS7362C is a MOS integrated circuit designed to generate the signals required to control three-phase or four-phase brushless DC motors. It is a fundamental building block for brushless DC motor controllers. The circuit responds to changes in SENSE inputs from motor position sensors to provide electronic commutation for the motor windings. PWM of the low-side drivers for motor speed control is achieved via the VTRIP input (analog speed control) in conjunction with the OSCILLATOR input. An overcurrent circuit is provided to protect the windings, associated drivers, and power supply. When the LS7362C detects an overcurrent condition, it immediately shuts down the external output drivers and re-enables them only when the overcurrent condition clears and a rising edge of the sawtooth OSCILLATOR occurs. This limits overcurrent detection cycling to the chopping rate of the sawtooth OSCILLATOR. Forward braking is also provided for rapid deceleration. The LS7362C is designed to drive both bipolar transistors and FETs. Since only the low-side drivers are pulse-width modulated, the LS7362C is well suited for applications where ICs interface with level shifters to drive high-voltage brushless DC motors. By PWM-ing only the low-side drivers, switching losses in the high-side driver level-shifting circuitry are minimized.

• PWM of low-side drivers only for speed control, reducing switching losses in high-voltage motor level-shifting circuits.
• Open-loop or closed-loop motor speed control; operating voltage +5V to +28V (VSS - VDD).
• Externally selectable input-to-output encoding for 60°, 120°, 240°, or 300° electrical sensor spacing.
• Three-phase or four-phase operation support.
• Analog speed control, forward/reverse control, output enable control, forward static braking, and overcurrent detection.
• Six outputs for direct switching bridge drive.
• Available in LS7362C (DIP), LS7362C-S (SOIC), and LS7362C-TS (TSSOP) packages.