PIC600 Volt Regulator question

[Peter]

Does anyone know anything about the PIC600 regulator? I'm trying to
understand a circuit I saw and it's used as a 5 volt regulator. Below is a
link to the datasheet that I found, but there doesn't seem to be enough
information on how to regulate the output to 5volts. There is only one
example circuit where they use a 2.5ohm resistor on the output as a load and
it shows 5 volts from the regulator, outside of that, I don't understand it.
The max output states 60 volts I believe so it looks like there is a way to
change the output voltage.

Do I not have the correct datasheet?


http://www.datasheetcatalog.com/datasheet/PI/PIC600.shtml

 

[Tim Perry]

Does anyone know anything about the PIC600 regulator? I'm trying to
understand a circuit I saw and it's used as a 5 volt regulator. Below is a
link to the datasheet that I found, but there doesn't seem to be enough
information on how to regulate the output to 5volts.

this "hybrid" is used as the "pass element" (or control element) of a
switching regulator. it is not a complete regulator in an of itself.

usually a pulse width modulated square wave is applied to the "drive"
terminal. (see page 7 fig 1)

There is only one
example circuit where they use a 2.5ohm resistor on the output as a load and
it shows 5 volts from the regulator, outside of that, I don't understand it.
The max output states 60 volts I believe so it looks like there is a way to
change the output voltage.

a 3 terminal regulators output voltage (referenced to common) can be
increased by referencing the "common" point of the device to a desired
voltage above the common point of the supply.

the output voltage of this switched mode regulator will depend upon the "on
time".

lets say the regulator is 100% turned on. the output voltage will be the
supply voltage minus the CE voltage drop (lets say 2 volts). if the load
draws 1 amp only 2 watts are wasted as heat
now turn the element off. zero current flows all the supply voltage drops
accross it now thre is no heat produced in the element.

Do I not have the correct datasheet?

next step it to locate the application notes that are referred to in the
data sheet.

these are also referred to as "switched mode" regulators.