Datasheet

SLVA037A
14 Designing a USB Power Distribution System Using the TPS2014 and TPS2015 Power Distribution Switches
Figure 6 shows that it took approximately 550 µs for the 2.5-A fuse to clear the fault. The fault
caused the system voltage to droop below 4 V for about 100
µs.
By comparison, the PTC resistor took approximately 150 ms to clear a fault and the system
voltage drooped below 4 V for 150 ms (see Figure 7). The power supply was in current limit for
this time, which would most likely interrupt system operation.
Notes:
1. Channel 1: Adjacent Port Output Voltage 1 V/div
2. Channel 2: Short-circuit Output Current 5 A/div
3. Time Scale: 50 ms/div
Figure 7. 2.5-A PTC Resistor Short-Circuit Test
The TPS2014 cleared the fault in approximately 45
µs and the system voltage never drooped
below 4 V (see Figure 8). The TPS2014 provides the most robust power system protection and
the best chance for a system to operate through a fault.