RoboteQ AX2550 Benutzerhandbuch

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When powered only via the Power Control input, the controller will turn On but motors will 
not be able to turn until power is also present on the VMot terminals.

The Power Control input also serves as the Enable signal for the DC/DC converter. When 
floating or pulled to above 1V, the DC/DC converter is active and supplies the AX1500’s 
microcomputer and drivers, thus turning it On. When the Power Control input is pulled to 
Ground, the DC/DC converter is stopped and the controller is turned Off.

The Power control terminal MUST be connected to Ground to turn the Controller Off. For 
turning the controller On, even though the Power Control may be left floating, whenever 
possible pull it to an unfused12V or higher voltage to keep the controller logic solidly On. 
You may use a separate battery to keep the controller alive as the main Motor battery dis-
charges.

The table below shows the state of the controller depending on the voltage applied to 
Power Control and Vmot.

TABLE 2. Controller Status depending on Power Control and VMot

Ground

Any Voltage from 0V to 40V

Controller is Off

Floating

0V

Controller is Off. Not Recom-
mended Off Configuration.

Floating

Between 8V and 10.5V

Controller Logic is On

Power Stage is Disabled (under-
voltage condition)

Floating

Between 10.5 and 40V

Controller is On. 

Power Stage is Active

Channel 1 MOSFET Power Stage

Channel 2 MOSFET Power Stage

5Vmin

40V max

Microcomputer & 

MOSFET Drivers

9.5V min

13V max

DC/DC

ENABLE

10.5V min

40V max

5Vmin

40V max

Power
Control
&Backup

VBatt Vmot

Mot1(-)

Mot2(-)

Mot1(+)

Mot2(+)

VBatt Vmot

GND

GND

GND

FIGURE 8. Representation of the AX1500’s Internal Power Circuits