XHSC-BLDC-36V10A

The XHSC-BLDC-36V10A supports PWM frequencies up to 100kHz, though typical applications use 10-20kHz for optimal balance between switching losses and current ripple. Higher frequencies (50-100kHz) can be used for smaller motors or when audible noise reduction is critical, but this increases switching losses in the MOSFETs. Lower frequencies (5-10kHz) reduce switching losses but may cause audible noise and higher current ripple. The PWM frequency can be dynamically adjusted through the SPI interface during operation, allowing optimization for different speed ranges. For most industrial applications, 16kHz provides good performance with minimal audible noise.

Use 16-20kHz for general industrial applications. Increase to 50kHz+ for noise-sensitive applications or decrease to 10kHz for maximum efficiency.

The XHSC-BLDC-36V10A implements advanced sensorless FOC using sliding mode observer (SMO) and phase-locked loop (PLL) techniques. The algorithm estimates rotor position by monitoring motor currents and voltages, eliminating the need for Hall sensors or encoders. Key features include: 1) Start-up algorithm - Open-loop start-up with current control transitions to closed-loop FOC once sufficient back-EMF is detected. 2) Observer tuning - Configurable observer gains for different motor parameters. 3) Speed range - Typically supports 10% to 100% of rated speed without sensors. 4) Load disturbance rejection - Fast current loops provide excellent dynamic response. The SPI interface allows real-time monitoring of estimated position and speed for debugging and optimization.

Sensorless FOC works well for most variable-speed applications. Add Hall sensors if precise low-speed control (<10% speed) is required.

For use with XHSC-BLDC-36V10A, select N-channel MOSFETs with these characteristics: 1) Voltage rating - Minimum 40V for 24V systems, 60V for 36V systems, providing adequate margin for voltage spikes. 2) Current rating - Select RDS(on) such that conduction losses are acceptable at maximum current. For 10A applications, look for <5mΩ at VGS=10V. 3) Gate charge - Lower Qg reduces switching losses and driver power dissipation. Target Qg < 50nC for good performance. 4) Package - D2PAK or DPAK for through-hole, Power-SO8 or LFPAK for surface mount. Recommended parts include XHSC-MOSFET-40V series or equivalent from major suppliers. Ensure adequate heat sinking for continuous operation at maximum current.

Select MOSFETs with voltage margin, low RDS(on), and moderate gate charge. Contact our FAE team for specific recommendations based on your operating conditions.

Dead-time on XHSC-BLDC-36V10A is configured through the SPI interface by writing to the CONFIG register. Dead-time ranges from 100ns to 3μs in 100ns steps. The required dead-time depends on MOSFET switching characteristics: 1) Measure MOSFET turn-off delay (td(off)) and fall time (tf) from datasheet. 2) Add safety margin (typically 50-100%) to account for variations. 3) Set dead-time to: td(off) + tf + margin. For typical MOSFETs with 100ns turn-off, use 200-300ns dead-time. Excessive dead-time increases body diode conduction losses, while insufficient dead-time risks shoot-through. The IC includes shoot-through protection as backup, but proper dead-time setting is essential for reliable operation.

Start with 500ns dead-time and optimize based on efficiency measurements. Monitor switching waveforms to verify adequate dead-time.

XHSC-BLDC-36V10A provides multiple current sensing options: 1) Low-side shunt resistors - Simple and cost-effective, placed in source of low-side MOSFETs. Integrated amplifiers with programmable gain (5x, 10x, 20x, 50x) amplify the shunt voltage. 2) Single shunt - Uses one shunt resistor on DC bus, reconstructed phase currents using SVPWM patterns. Lower cost but requires specific PWM patterns. 3) Hall effect sensors - External Hall sensors can be interfaced for isolated current measurement. The IC supports overcurrent protection using any of these methods with programmable thresholds. Current feedback is available through SPI for control algorithm implementation. For best FOC performance, dual or triple shunt configuration is recommended.

Use triple shunt for best FOC performance, single shunt for cost-sensitive applications. Hall sensors provide isolation but add cost.

Yes, XHSC-BLDC-36V10A can drive both BLDC and PMSM motors. The key difference is in the control algorithm: 1) BLDC motors use trapezoidal commutation with six-step switching, which is simpler but produces more torque ripple. 2) PMSM motors use sinusoidal commutation with FOC, providing smoother operation and higher efficiency. The XHSC driver supports both modes through software configuration. For PMSM motors, the FOC algorithm requires more processing power from the external MCU but delivers superior performance including: better speed regulation, lower torque ripple, higher efficiency (especially at partial loads), and smoother operation at low speeds. The same hardware can be used for both motor types by changing the control firmware.

Use trapezoidal control for simple BLDC applications. Use FOC for PMSM motors or when smooth operation and high efficiency are required.