SMI21
31
It should be noted however that this is a simplified and somewhat pessimistic calculation since it does not
take account of the energy stored in the capacitors, nor that lost during friction, the gearbox, etc.
9.1.1.3.
Voltage Breaking Capacity Selection
The voltage breaking capacity should be selected:
-
Depending on the power supply
-
Depending on the other devices connected to this power supply
If your power supply does not tolerate current feedback, place a diode in series upstream of the ballast
circuit to protect it.
The voltage breaking capacity usually selected is b10% and +20% of the supply voltage.
E.g.: For 24 VDC the voltage breaking capacity would be 28 VDC.
List of components for the usual operating voltages:
Nominal voltage
12V
24V
32V
48V
Voltage breaking
capacity
14V
28V
36V
52V
D1
SMBJ14A
SMBJ28A
SMBJ36A
SMBJ54A
R13
0R
560R 0.5W
1K 1W
2K2 2W
R5
15K 1%
4K32 1%
3K09 1%
1K95 1%
9.1.2. EMC Protection
In order to ensure that the product is compatible with EMC standards IEC 61000-6-1, IEC 61000-6-2, IEC
61000-6-3, IEC 61000-6-4, we recommend:
-
Connecting the motor to ground while limiting length of the grounding strip,
-
Adding capacitors on the main power supply.
We recommend 1000 µF per amp drawn.