Use the following instructions to
measure the inrush current during hot plug event:
- Configure the jumper J3 position to the desired slew rate
mentioned in Table 4-3.
- Configure the jumpers J4 and J5
positions to the desired current limits during start-up as mentioned in Table 4-3.
- The reference voltage for
overcurrent protection and active current sharing is at 1 V by default.
- Connect a load of 0.4 Ω between
VOUT (Connector T2) and PGND (Connector T3).
- Connect the negative terminal of
the power supply to connector T3.
- Set the input supply voltage VIN to 12 V and current limit to
100 A. Enable the power supply.
- Hot plug the positive terminal of the power supply at connector
T1.
- Observe the waveforms at VOUT (TP4) and input current using an
oscilloscope to measure the slew rate and rise time of the VOUT with a given
input voltage of 12 V.
Figure 5-2 shows the waveforms captured on the TPS25990EVM with one (1) TPS25990 eFuse and
one (1) TPS25985 eFuse in parallel during the hot plug event.