Microchip Technology MA300015 데이터 시트
AN1208
DS01208A-page 14
© 2008 Microchip Technology Inc.
MODIFYING THE dsPICDEM HIGH VOLTAGE
POWER MODULE
POWER MODULE
The following steps outline the procedure to set up the
the board:
the board:
1.
FIGURE 11:
ESTABLISH COMMON
POWER AND DIGITAL
SIGNAL GROUND
POWER AND DIGITAL
SIGNAL GROUND
2.
Replace resistor R15 with a 390 kOhm resistor.
3.
Replace resistor R13 with a 158 kOhm resistor.
4.
Connect LK30 to the BUS_SENSE terminal by
using a signal wire.
using a signal wire.
5.
Place 5.6 kOhm resistors on links LK20, LK21,
and LK31, as shown in Figure 12.
and LK31, as shown in Figure 12.
FIGURE 12:
INSTALL FEEDBACK
CURRENT SELECTION
RESISTORS
CURRENT SELECTION
RESISTORS
6.
Remove the LK2 jumper connection and place a
link on jumper LK1.
link on jumper LK1.
7.
Place jumper LK4 in the 1-2 position.
8.
Place jumpers on link LK5 through LK12.
AFTER
J13
J5
BEFORE
J5
J13
Because shunt resistors are used to sense current
from the motor, power and digital signals must use
the same ground.
from the motor, power and digital signals must use
the same ground.
Solder a high-current jumper wire (AWG 18
minimum) between J5 and J13.
minimum) between J5 and J13.
Jumper
To obtain feedback current, the circuit links must
be completed.
be completed.
To activate the current feedback for this
application, populate links LK20, LK21, and LK31
with 5.6 k
application, populate links LK20, LK21, and LK31
with 5.6 k
Ω resistors.
LK20, LK21, and LK31 Links
5.6 k
Ω Shunt Resistors
BEFORE
AFTER