AD-DRVLV2-EBZ Low Voltage Drive Board

Features

• Connects to the Controller board with a power stage that drives motors up to 48 V and 20 A

• Drives 2 motors simultaneously

• High frequency drive stage implemented with ADI isolated gate drivers

• Supported motor types

  • BLDC

  • PMSM

  • Brushed DC

  • Stepper (bipolar / unipolar)

• Integrated over current protection

• Reverse voltage protection

• Current and voltage measurement using isolated ADCs

  • Current measurement on 2 phases for 2 motors

  • DC Link Voltage measurement

• BEMF zero cross detection for sensorless control of PMSM or BLDC motors

• Separate voltage supplies for the 2 motors so that the motors do not influence each other

Block Diagram

Figure 1 Simplified block diagram

Picture and Main Components

Figure 2 AD-DRVLV2-EBZ top side

Figure 3 AD-DRVLV2-EBZ bottom side

Key Parts

Part	Description
Measurement
AD7403	16-bit isolated 2nd order Sigma-Delta modulator
AD8207	Zero drift, high voltage, bidirectional difference amplifier
CMP04	Quad low power, precision comparator
Power
ADuM5000	isoPower® integrated isolated dc-to-dc converter
ADP1621	Constant-frequency, current-mode step-up dc/dc controller
ADP2301	1.2 A, 20 V, 1.4 MHz non-synchronous step-down switching regulator
MOSFET Drivers
ADuM5230	Isolated half-bridge driver with integrated high-side supply
ADuM7223	Isolated precision half-bridge driver, 4.0 A output

Switches

Figure 4 Drive board switches

Emergency Stop switch

• S2 is a latching emergency stop switch.

• If triggered, the supply for the power stage is turned off.

Reset switch

• S1 is a reset switch for the emergency stop latch.

• Pressing S1 when S2 is not pressed turns the power stage on.