Four and five terminial PWM-controlled power supply packages

A power supply package for providing pulse-width modulated control of a power converter, comprising:

• a first terminal for coupling to a first primary winding of a transformer;
• a second terminal for coupling to a second primary winding of the transformer;
• a third terminal for coupling to a ground reference;
• a fourth terminal for coupling to a combined source of operating power and feedback signal, the feedback signal based on an output load voltage across a secondary winding of the transformer;
• a first power switch having an input coupled to the first terminal, an output coupled to the third terminal, and a first switch activation gate;
• a second power switch having an input coupled to the second terminal, an output coupled to the third terminal, and a second switch activation gate;
• and
• control circuitry responsive to the feedback signal, the control circuitry including gate drive circuitry having a first output coupled to the first switch activation gate and a second output coupled to the second switch activation gate, the gate drive circuitry configured to drive the first and second power switches.

A power supply package for providing pulse-width modulated control of a power converter, comprising:

• a first terminal for coupling to a primary winding of a transformer;
• a second terminal for coupling to an activation gate of an external power switch;
• a third terminal for coupling to a ground reference;
• a fourth terminal for coupling to a source of operating power;
• a fifth terminal for coupling to a feedback signal based on an output load voltage across a secondary winding of the transformer;
• an internal power switch having an input coupled to the first terminal, an output coupled to the third terminal, and an activation gate;
• and
• control circuitry responsive to the feedback signal, the control circuitry including gate drive circuitry having a first output coupled to the internal power switch activation gate and a second output coupled to the second terminal, the gate drive circuitry configured to drive the internal and external power switches.

A power supply package for providing pulse-width modulated control of a power converter, comprising:

• a first terminal for providing a connection to a first primary winding of a transformer;
• a second terminal for providing a connection to a second primary winding of the transformer;
• a third terminal for providing a connection to a ground reference;
• a fourth terminal for providing a connection to a source of operating power;
• a fifth terminal for providing a connection to a feedback signal based on an output load voltage across a secondary winding of the transformer;
• a first internal power switch having an input connected to the first terminal, an output connected to the third terminal, and a first switch activation gate;
• a second internal power switch having an input connected to the second terminal, an output connected to the third terminal, and a second switch activation gate;
• and
• control circuitry responsive to the feedback signal, the control circuitry including gate drive circuitry having a first output coupled to the first switch activation gate and a second output coupled to the second switch activation gate, the gate drive circuitry configured to drive the first and second power switches.