EVAL6207N Datasheet, PDF (30/34 Pages) STMicroelectronics – PractiSPIN evaluation system configuration and set up guide

EVAL6235 board configuration
12 EVAL6235 board configuration
AN1794
Note:
Note:
The schematic of the EVAL6235 board is shown in Figure 9. To use the EVAL6235 board
with practiSPIN system, the following configuration settings must be made on the
EVAL6235:
1. Component updates: depending on the revision of the board, some or all of the
following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 and C7 to 5.6 nF
– Change R6 to 100 kΩ and remove R2
b) To assure an adequate 5 V supply, R1 may need to be changed. The minimum
value for R1 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any
additional load (such as Hall sensors) placed on the5 V supply (in amps).
2. JP1 and JP2: install JP1 and JP2 to enable the on-board 5 Vdc supply.
3. Switches: place all four switches in the down (away from U2) position.
4. R22: adjust multi-turn trim pot R22 fully clockwise.
A slight click can be heard from the pot when it reaches its end of travel.
5. R10: adjust multi-turn pot R10 to the middle of its range. This pot sets the off time of the
cycle by cycle current controller and can be fine tuned while observing the motor
current on an oscilloscope or by simply adjusting to raise the frequency of the audible
switching noise to an inaudible level if required.
6. Hall sensors: connect the hall sensors of the BLDC motor at CN5. Connect the power
supply wires from the hall sensors at pins GND and P5V. Hall sensors are notorious for
being destroyed by reversed polarity! Know, don't guess, the proper polarity! Connect
H1, H2, and H3 signals to their respective pins.
7. Motor connections: connect the three motor armature wires at CN3 being careful to
match the phasing to the hall sensor connections. Please refer to the L6235 data sheet
for a description of the proper phase relationship between the motor phases and the
Hall sensors.
There are six possible ways to connect the three armature wires to CN3. While only one
connection will give proper performance, one or two of the other possible connection may
cause the motor to turn but with very poor performance and, perhaps, high motor currents
even if the system is unloaded.
8. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1
(positive to V_in and negative to GND).
9. Using a 34 pin ribbon cable connect the EVAL6208PD board to the control interface
board. The two boards should be placed on the bench so that their 34 pin headers are
side by side with the ribbon cable going straight across. Set the following on the ST7
interface board.
10. WJ1: install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to
be obtained from the target board.
11. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins
together. This is critical as excessive motor current can result from misplacement of
these jumpers! Set potentiometer R18 to about 50%.
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