Use the following instructions to measure the inrush current on CH1 during Hot-Plug event:
For checking inrush current control capability, insert load capacitance of 470 uF at output terminal T2
Make J3 OPEN.
- Change Cdvdt capacitor C2 to 150 nF.
- Set the input supply voltage VIN to 12 V and current limit of 2 A. Enable the power supply.
- Hot-plug the supply at input terminal T1.
- Observe the waveform at VOUT1 (TP2) with an oscilloscope to measure the slew
rate and rise time of the eFuse with a given input voltage of 12 V.
Figure 5-2 shows an example of inrush current profile captured on the TPS1641EVM Evaluation Board.
Figure 5-2 CH1 Output Rise Profile (VIN = 12 V, CdVdT =
150 nF, COUT = 470 uF, No Load)