SLUUCB4 June 2020 TPS25980
5.1 Hot-Plug Test
Use the following instructions to measure the inrush current during Hot-Plug event:
- For checking inrush current control capability, insert additional capacitance of 1800 uF at C16 terminals. Total output capacitance = 1800 uF + 220 uF ~2 mF.
- Set Jumper J12 in 3-4 position to set Cdvdt at 10 nF for o/p slew rate of 0.5 V/ms.
- Set the input supply voltage VIN to 12 V and current limit of 5 A. Enable the power supply.
- Hot-plug the supply between input connectors J1 and J3.
- Observe the waveform at VOUT (TP2) with an oscilloscope to measure the slew rate and rise time of the eFuse with a given input voltage of 12 V.
Figure 3 shows an example of inrush current captured on the TPS25980EVM eFuse Evaluation Board.
Figure 3. TPS259804O Output Rise Profile (VIN = 12 V, CdVdT = 10 nF, COUT = 2 mF, No-load)