75V/10A Protected Full-Bridge Power Stage Reference Design for Bipolar Stepper Drives
Description
Stepper drives are used in many applications operating typically from 12VDC to 48VDC. TI offers a rich family of stepper motor driver solutions with industry standard step/direction and parallel control interfaces. For applications which require higher torque and power: often voltages above 48VDC: up to 100VDC are used. The TIDA-00210 provides a solution for such stepper drives. The TIDA-00210 uses two protected full-bridge power stages based on TIDA-00365 in parallel configuration. Each full-bridge operates nominal 75VDC and 10Arms phase current and features bipolar high-side current sensing leveraging a 100V full-bridge gate driver SM72295 with integrated amplifiers and four 100V NexFET power MOSFETs with ultra-low gate charge and small SON5x6 package with low thermal resistance. The power stage is fully protected against over-temperature: over-current and short-circuit between the motor terminals and motor terminals to ground. Onboard power supplies provide a 12V and a 3.3V rail for the gate driver and signal chain. The host processor interface is 3.3V I/O to connect a host MCU like C2000 Piccolo for stepper motor control.
Features
- Protected full-bridge power stage with input voltage up to 100VDC (75VDC nominal) and 10Arms phase current.BOM reduction using SM72295 100V full-bridge gate driver with integrated amplifiers used for high-side bipolar phase current sensing: supporting up to 256 micro steps.95% efficiency at 16 kHz PWM: nominal load with very low switching losses to support higher PWM frequencies too. No heatsink required at 25C ambient and nominal load thanks to TI NexFET power MOSFET.Full-bridge optimized for low EMI thanks to NexFET’s fast turn-on and turn-off switching time: 25ns with no overshoot on switch-node voltages.Hardware protected against over-temperature: over-current and short circuit between phase to phase and phase to GND: as well as UVLO. Thresholds are custom configurable in HW.3.3V host processor interface allow MCU like C2000 to implement custom stepper motor control. The complementary PWM inputs and bipolar high-side current sense buffered 0-3.3V analog output allow for precise phase current control. Phase to GND voltage feedback signals allow for back EMF sensing and stall detection. An Enable signals allows the MCU to turn-on and turn-off the power stage.
Applications
- Closed loop stepper
- Stage lighting
- Open loop stepper
Product Categories
- Power management