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ADuM3471: using primary power 3.3V AND 5V ?

Question asked by avj on Mar 4, 2015
Latest reply on Mar 5, 2015 by avj

Hello,

 

we use ADuM3471 in a isolating design to interface a DAC to the CPU and generate the needed 12V for the analogue output circuit.

Our implementation is like the reference design (datasheet, Fig.38).

VDD1 ( 5V ) is connected to ADuM (VDDA) and to the middle of the primary side of the external power transformer ( KA4976-AL ).

 

Question:

is it possible to power the ADuM (Pin 9 VDDA) with 3.3V to get 3.3V digital signals and at the same time power the primary side of the external transformer with 5V to have higher efficiency and higher load current at the isolated side ?

 

Greetings Andres

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