DC-to-DC converter providing stable operation

A control circuit for use in a DC to DC voltage converter, said control circuit comprising:

• a first section constructed on a chip for accepting an input control signal and for providing an output control signal proportional to accepted ones of said input signals;
• a second section for accepting said first section control signal and converting said control signal to an output DC voltage, said output DC voltage being the highest voltage desired as an output of said DC-to-DC converter;
• said output DC voltage also being a function of an input current supplied separate from said first section control signals;
• and
• said separately supplied input current being fixed such that said output DC voltage, in the absence of a control signal from said first section, would be said highest voltage.

An amplifier for controlling a specific output voltage;

• said amplifier comprising:
• a first portion for accepting an input signal and for providing an output current in response to said input signal;
• and
• a second portion coupled to said first portion for processing said output current signal into a variable voltage signal ranging from ½ volt to 32 volts, wherein said first portion is constructed on a chip having a 5 volt capability and wherein said second portion is constructed off of said chip.

A DC-to-DC converter comprising:

• a summer for accepting a reference frequency at one input;
• a VCO;
• a feed back loop connecting said VCO output frequency to one input of said summer;
• said summer providing an error signal based on said reference and said VCO output frequency;
• an amplifier;
• said amplifier comprising:
• a first portion for accepting an input signal and for providing an output current in response to said input signal;
• a second portion coupled to said first portion for processing said output current signal into a variable voltage signal for controlling said VCO, said voltage signal ranging from ½ volt to 32 volts, wherein said first portion is constructed on a chip having a 5 volt capability and wherein said second portion is constructed off of said chip;
• and
• means for providing said error signal as said input signal to said amplifier.