AN313
feature
(PLOSS signal) to remain active. Low-cost diodes, such as 1N4002, can be used to bypass the diodes on the Si3400 and Si3401 because they have a slightly lower voltage drop. This will help spread the heat in higher power applications. For higher efficiency, Schottky diodes can be used. It is also possible to use just the upper four or lower four diodes for half the benefit at half the cost. Using the full bypass, the power in the Si3400 and Si3401 is reduced to 0.5 W at 5 V/2 A output and 0.83 W at 5 V/3 A (15 W) output. Both of these power levels are well within the thermal capability of the Si3400 and Si3401 packages. With the one-half bypass, the power in the Si3400 and Si3401 packages is at the 1.2 W maximum for a 5 V/ 2.6 A (13 W) load.
2. Power and Thermal Considerations
The Si3400 and Si3401 were intentionally designed with "hot swap" switch current limits well above the 350 m A maximum current specification of 802.3af so as not to limit the PD from drawing more...
