Analog Devices ADP1046A User Manual page 32

100 watt evaluation kit

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ADP1046A 100Watt

Evaluation board

Internal short circuit action on OrFET: Figure 52 and Figure 53 shows the OrFET disabled during an internal short

circuit and its corresponding flag. An internal short of the synchronous rectifiers can be simulated in the PWM settings

or by physically shorting the drain pin of Q2 and Q3. The CS1 fast OCP or the UVP flags can be set to disable the

OrFET.

Figure 52 - Synchronous rectifiers shorted, 48VDC, 8A load

Upper trace: OrFET gate voltage, 10V/div, 5us/div

Lower trace: Primary current, 5A/div, 5us/div

Figure 51 - OrFET disabled when VS3 is greater than OVP limit

Green trace: Output voltage

Red trace: OrFET Gate signal

Rev. 1.3 | Page 32 of 55

Figure 53 - Corresponding 'Flags and Readings" window. UVP was the first

flag that tripped

PRD1386

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Adp1046a-100-evalz