Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V
?Thanks.
KCJ
Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V
?Thanks.
KCJ
A low drop out type might be needed. ~1V to 5V adjustment more probable due to internal references typically around 1V to 1.5V. As an example:
A dc-dc converter chip like the TI MC33063 and a few external components will do it, except the minimum is 1.25 volts.
Since your current requirement is low, you can use a trick to get down below 1 volt:
Vin--[Regulator]Vout---+ | | | [Load] | | | [D1] | | | [D2] | | Gnd ------+------------+
or Vin--[Regulator]Vout---+ | | | [Load] | | +------------+ | [D1] | [D2] | Gnd ------+
If you short out D1 and D2 when Vout needed is above 1.25, you get better regulation.
Note that [Regulator] above is used to represent the complete regulator circuit and its associated components - the drawings are intended to show only the addition of the two diodes, not the complete circuit.
Ed
Most 'adjustable regulators' use a resistor divider on the output and compare to a fixed (1.2V typically) reference, so they only go to 1.2V minimum. Three-terminal and four-terminal regulators are ruled out.
The LM10 op amp includes a voltage reference, and can get close enough to the rails to do what you want, except the 100 mA part. Can you settle for 20 mA?
Add a pass transistor to the LM10 and it's easy.
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