ADP1614 CUK/SEPIC

bjalgera on May 8, 2019

Can someone explain the "extra" MOSFET in the CUK/SEPIC configuration of this circuit? It is shown in the output of the Excel design tool, but it is not shown in app note AN-1106.

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Fil
May 15, 2019 +1
In AN-1106, it is the Q1 represented as a simple switch in Figure 1, page 1.
Fil
May 30, 2019 in reply to bjalgera +1 suggested
Cascode FET. Please refer to this ADI article: Use a boost regulator beyond its rated voltage

https://www.edn.com/design/analog/4368842/Use-a-boost-regulator-beyond-its-rated-voltage

+1 Fil

on May 15, 2019 5:41 AM
In AN-1106, it is the Q1 represented as a simple switch in Figure 1, page 1.
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0 bjalgera on May 15, 2019 2:49 PM in reply to Fil

My understanding is that the Q1 switch in that figure is the internal FET in ADP1614... In the schematic capture above, there are essentially two FETs in series...
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0 Fil

on May 30, 2019 12:53 AM in reply to bjalgera
Cascode FET. Please refer to this ADI article: Use a boost regulator beyond its rated voltage

https://www.edn.com/design/analog/4368842/Use-a-boost-regulator-beyond-its-rated-voltage
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