Naughty Birthday Cakes Men

x Icom R75 Group

I was asked to explain the solution I have chosen to power the receiver R75.
well, I thought: "... and now that the story ?..."
so I could start :....
the receiver in question is equipped with an internal linear regulator
which produces its output a constant voltage of 13.6 V with a maximum absorption of 1.1a.

Considering that in the temperature range of operation, the temperature can reach up to 45-50 ° C by
decrease the power dissipation of 1.3 W max (see performance chart below)

and recalling that the max current is 1.1A

we can extrapolate the maximum voltage that can fall across the series regulator.

Datasheet Cosultando the regulator (the PQ30RV31 SHARP) we see that the maximum dropout as a function of current and temperature is 0.15V which we approximate to 0.2 V.

Now we have all the data to decide which pre-stabilized voltage applied to the radio, without interfere with the functioning of the equipment.

This is the maximum voltage that can be applied.

While the minimum is given by

I chose to feed all at 13.8VDC .... Under the scheme regulator

ext.

E 'Remember that the LT1038 regulator needs a good dissipation.
I recommend using at least one heat sink like this.

I'm here for questions, requests or criticisms! Hello