SLVUBX9 October 2020 TPS2640
4.4.2 Output Voltage Start-Up Time Test
Follow the instructions to verify the individual channels output voltage start-up time:
- Set up the oscilloscope as listed in Table 4-7.
- Set the load resistance to 16 ? ±1 ? and the power supply voltage to 24 V.
- Enable the load.
- Enable the power supply and verify that the output voltage startup waveform is as shown in Figure 4-2.
Table 4-7 TPS2640EVM Oscilloscope Setting for the Output Voltage Start-Up Test
| Oscilloscope Setting | CH1 Probe Points | CH2 Probe Points |
|---|---|---|
| Channel 1 = 10 V / div | VOUT1 (TP3) | VOUT2 (TP12) |
| Channel 2 = 10 V / div | VIN1 (TP2) | VIN2 (TP11) |
| Channel 3 = 20 V / div | FLTb1 (TP1) | FLTb2 (TP10) |
| Channel 4 = 1 A / div | Input current into T1 +Ve wire | Input current into T3 +Ve wire |
| Trigger source = Channel 1 | ||
| Trigger level = 12 V ±1 V | ||
| Trigger polarity = Rising | ||
| Trigger mode = Single | ||
| Time base | 2 ms / div |
Figure 4-2 Output Voltage Start-Up Waveform