IM483H/IM805H Rev. R032206
36
37
IM483H/IM805H Rev. R032206
M o t o r P o w e r
Pins 5 (+V), and 2 & 8 (GND) on connector P2 are used to connect motor DC
power to the IM483H/IM805H. Two local capacitors are needed. These must
be located as close to the IM483H/IM805H’s motor power input pins as pos-
sible to ensure stable operation.
The first two capacitors, one for each motor phase, are low impedance alu-
minum electrolytics. The continuous operating voltage of the capacitor should
exceed the maximum supply voltage as well as any additional voltage caused
by the motor’s back EMF. The value of the capacitors should be approximately
150µF for every amp of peak per phase output current.
For power supply specifications and recommendations, see Section 5:
Power
Supply Requirements.
CALCULATING THE VALUE OF THE INPUT CAPACITORS
EXAMPLE: 3.2A (Peak Output Current @ 45VDC) X 150µF = 480µF 63V
Figure 7.1: Power Interface
+
ADDITIONAL
ELECTROLYTIC
CAPACITOR
ADDITIONAL
ELECTROLYTIC
CAPACITOR
+
+5VDC
SUPPLY
MOTOR
SUPPLY
+
+
-
-
GNDA
GNDB
+V
GND
+5V
1
9
P2
.1uF
100V
.1uF
100V
+
68uF
10V,TANT
TOPSIDE PCB TRACES
BOTTOMSIDE PCB TRACES
8 7 6
4 3 2