13.13 Power Supply Input (HV_DD)

Connect HV_DD to the main supply voltage. This voltage should be the same as the motor voltage. The driver overcurrent and overvoltage shutdown features are relative to the HV_DD pin. When the HV_DD voltage is separate from the motor voltage, the overcurrent and overvoltage protection features may not be available.

The HV_DD voltage must not exceed the maximum operating limits of the device. Connect a bulk capacitor close to this pin for good load step performance and transient protection. The actual capacitance should be equal to or larger than the sum of the capacitors attached to the driver supply outputs. The attached capacitors are the V_REG, V_BOOT and VBx (three bootstrap capacitors) and the charge pump capacitances.

CHV_DD ≥ CV_REG + CV_BOOT + (3 × CV_BX) + C_CAPx

The type of capacitor used may be ceramic, tantalum or aluminum electrolytic. The low-ESR characteristics of the ceramic will yield lower voltage drop, better noise and PSRR performance at high frequency.