Use the following instructions to capture the pre-charging current profile:
- First, disable both the Main MOSFETs and pre-charge FET by connecting INP (TP6) and INP_G (TP24) to ground.
- Set the jumper setting on EVM to default position as shown in Table 5-1.
- Set the input supply voltage VIN to 48 V and current limit of 10 A.
- Enable the power supply.
- Enable the control input (INP_G at TP24) of the pre-charge MOSFET by releasing the ground connection.
- Observe the waveform at SRC. That is, VOUT (TP2) with an oscilloscope.
Figure 5-2 shows an example of pre-charging current profile captured on the TPS48111Q1EVM Evaluation Board.
Figure 5-2 Pre-charge Profile of the Output Capacitance (VIN = 48 V, COUT = 440 µF, No-load)