AN3134

Demonstration board description

Doc ID 16960 Rev 1

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Figure 2.

EVAL6229QR demonstration board pin locations

The decoding logic integrated in the device is a combinatory logic which provides the

appropriate driving signals for the three-phase bridge outputs, based on the signals coming

from the three hall sensors H1, H2 and H3. The hall sensors detect rotor position in a 3-

phase BLDC motor.

The EN pin connected to the diagnostic output DIAG is used to implement the overcurrent

and thermal protection.

To perform PWM current control, an analog reference voltage should be provided at the

VREF pin. A fixed reference voltage can be easily obtained through a resistor divider from

an external voltage rail and GND (possibly that which supplies the microcontroller or the rest

of the application). Alternatively, a very simple way of obtaining a variable voltage without

using a DAC is to low-pass filter the PWM output of a microcontroller.

Table 2 summarizes the electrical specifications of the application, Figure 3 shows the

electrical schematic, and Table 3 provides the component list.