User Manual
21
Revision 2.1
2018-07-09
EVAL-M1-05-65D User Manual
iMOTION
™
Modular Application Design Kit
Schematics and Layout
6.5
Power supply
Figure 14 depicts the schematic of the power supply available on the EVAL-M1-05-65D board. The circuit
includes a LNK304 that is used to generate 15 V (V
cc
) directly from the DC bus. V
CC
is connected to the gate
drivers inside the CIPOS
™
Micro.
The linear regulator LD1117S33 generates 3.3 V from V
CC
. The 3.3 V power supply is used in the over current
comparator circuit. Led LED1 is used to signal whether the board is powered or not. Both, V
CC
and 3.3 V are also
present on the 20 pin interface connector J3 to power circuitry on the controller board.
Figure 14 Power supply section of the EVAL-M1-05-65D evaluation board
6.6
Over current circuit
Figure 15 displays the over current protection circuitry. The open collector output GK of the comparator is
pulled up to 3.3 V and filtered through resistor R5 and capacitor C13.
The comparator threshold can be set through the voltage divider provided by resistors R6 and R7. By default for
emitter shunt trip, R7 is 1k
Ω
. In single shunt application R7 needs to be changed to 3.48k
Ω
.
Figure 15 Over current protection circuit on the EVAL-M1-05-65D evaluation board