USB grid charger

AN4647

4/9

DocID027372 Rev 1

2

USB grid charger

To measure inrush current in fuse, a commercial grid USB charger is used.

Following severe conditions are applied:

•

100 000 inrush surges (50 plug-in by day during 5 years)

•

Ambient temperature = -30, 25°C and 85°C

Figure 2 shows the experimental setup used to measure inrush current with a grid charger.

Figure 2. Grid charger experimental setup

The grid charger is connected between Vbus and GND of the characterization board.

It presents 5.6 A maximum and 12.5 µs width. A small oscillation is present due to the LC

V, inrush current is at 0 A.