Trust Automation, Inc. TA333 High Power Linear Servo Amplifier
10-Apr-09 Page 32 of 38
5.3 Brushless Motor, Trapezoidal, Hall Commutation
Pending
Figure 21 – Application Example 3
This figure shows the TA333 operating in trapezoidal mode with single ended command input. Active-
low enable, active-low FAULT, driving a single brushless servo motor, and using Hall Effect sensors at
120° timing for trapezoidal commutation. The TA333 is set for a fixed current limit of 15A with a
transconductance of 1.5A/V.
Hall Sensors are connected to J4. If the motor has differential Hall outputs, only connect the “+” Hall
outputs to J4 and leave the “–” Hall signals unconnected. (Do not tie to ground, the motor will be
damaged.) Note that Hall 5V power supplied by the TA333 is limited to 20ma. If the motor hall sensors
require >20mA for operation, an external 5V power source must be used.
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