User Manual

MCP Series
Brushed DC Motor Controllers
MCP Series User Manual
35
1.5.4 Backup Power
An optional backup battery is supported. Under heavy loads the main power can suffer voltage
drops, causing potential logic brown outs if the voltage dips below approximately 8VDC, which
may result in uncontrolled behavior. A separate power source for the motor controllers logic
circuits, can remedy potential problems from main power voltage drops. The backup battery
maximum input voltage is 15VDC with a minimum input voltage of 6VDC. The 5VDC regulated
user output is supplied by the secondary backup battery if supplied. The mAh of the backup
battery should be determined based on the load of attached devices powered by the regulated
5VDC user output. The MCP controller will automatically use the appropriate power source
depending on the current voltage of either power source.
+
-
Motor 1
Motor 2
R1
F1
D1
M1A
M1B
M2B
M2A
B-
B+
MCP
F2
+
-
Backup
DC Power
SW1
SW2
GND
LB+
Main
DC Power