Technical information

Easy Automotive Modules
Evaluation Kit EASYKIT AUX DRIVES (FS50R07W1E3_B11A)
Experimental Results
Application Note 31 AN2012-10
Evaluation Kit EASYKIT AUX DRIVES (FS50R07W1E3_B11A)
6 Experimental Results
6.1 Test sequence
The test sequence concept was explained in Section 4.5. Figure 21 shows the measured waveforms from
the mixed signal scope during the active switching part. The major events are numbered on the bottom of the
screen shoot. Please take note that the phase voltages during switch turn-off phases can have different
shapes depending on the connected load. However, when a switch is turned-on the Vce voltage of this
switch has to be always low.
Legend
Complete test sequence
A1 V_U
A2 V_V
A3 V_W
A4 V_DCL
D0 PWM_UT
D1 PWM_UB
D2 PWM_VT
D3 PWM_VB
D4 PWM_WT
D5 PWM_WB
D6 HSflt_disable
D7 nFLT_uC
D8 nRST_uC
D10 toggle at
PWM timer period
D11 ADC ISR &
ADC value read
at self test routine
D12 PWM ISR
code for test
pulse generation
D13 DRIVER_U
/RSTHS
Figure 21 Overview of the active self test sequence. Low side and high side switching.
1. The low side phase U switch is turned-on and off
2. The low side phase V switch is turned-on and off
3. The low side phase W switch is turned-on and off
4. The low side switching test is PASSED and all low side switches are turned-on (default wait state)
5. The high side phase U switch is turned-on and off (after low side switch turn-off)
6. The high side phase V switch is turned-on and off (after low side switch turn-off)
7. The high side phase W switch is turned-on and off (after low side switch turn-off)
8. The high side switching test is PASSED and all low side switches are turned-on (default wait state). The
test sequence is successfully PASSED
1 2 3 4 5 6 7 8