Test results

UM1063

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DocID018573 Rev 2

7.3.5

Line transient

Figure 24 depicts the effect of a line transient on the PoE converter. A 12 V step on a 42 V

input PoE line (green trace) is shown. The hot-swap MOSFET (yellow trace) withstands the

transient while the input current (pink trace) is limited during the input capacitor charge; the

converter continues to work and the output voltage (blue trace) remains in regulation.

Figure 24. Effect of a 12 V line transient on the converter at 4 A load

Figure 25. Effect of a 12 V line transient on the converter at 0 A load