DRM33395 Datasheet, PDF (39/44 Pages) Motorola, Inc – ANALOG ICs 33395 EVALUATION MOTOR BOARD DESIGNER REFERENCE MANUALv

Freescale Semiconductor, Inc.
33395 Evaluation Motor Board
Section 5. Design Considerations
5.1 Contents
5.2 Overview...................................................................................37
5.3 3-Phase H-Bridge .....................................................................37
5.4 Bus Voltage and Current Feedback Signals............................. 38
5.5 Back-EMF Signals .................................................................... 40
5.6 Brake Control ........................................................................... 41
5.2 Overview
From a systems point of view, the SMOS EVM motor board kit fits into
an architecture that is designed for application development. In addition
to the hardware that is needed to run a motor, a variety of feedback
signals that facilitate control algorithm development are provided.
The SMOS EVM motor board’s power output stage is a complementary
MOS field effect transistor (MOSFET) 3-phase bridge that is capable of
supplying and sensing 8 amps of continuous current. Feedback signals
include bus voltage, phase currents, reconstructed bus current,
Back-EMF (electromotive force), and zero crossing. The following
sections describe these features.
5.3 3-Phase H-Bridge
Use of the Motorola integrated 3-phase gate driver, MC33395,
considerably simplifies control of the output stage which is configured as
a 3-phase H-bridge with six complementary N-MOSFET output
transistors. Together with external components this device provides
33395 Evaluation Motor Board
DRM33395 Designer Reference Manual
MOTOROLA
Design Considerations
37
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