DC-DC converter capable of performing for wide and dynamic voltage range
AssigneeRicoh Company, Ltd.
InventorJunji Nishida
Life of this patent
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Abstract
This patent specification describes a DC-DC converter which includes a switch configured to control an output voltage, a driver circuit configured to drive the switch, a flip-flop configured to control the driver circuit, an error amplifier configured to compare a feedback voltage of the output voltage with a reference voltage, a detector configured to sense an output current, a control voltage generator configured to generate a control voltage being ramped and a PWM comparator configured to compare the control voltage with an output voltage of the error amplifier and output a reset signal to the flip-flop. Ramping speed of the control voltage is changed in accordance with an external-control voltage input at an external-control terminal.
Claims7
A DC-DC converter, comprising:
- a switch configured to control an output voltage;
- a driver circuit configured to drive the switch;
- a flip-flop configured to control the driver circuit;
- an error amplifier configured to compare a feedback voltage of the output voltage with a reference voltage;
- a detector configured to sense an output current;
- a control voltage generator configured to generate a control voltage being ramped;
- and
- a PWM comparator configured to compare the control voltage with an output voltage of the error amplifier and output a reset signal to the flip-flop,
- wherein ramping speed of the control voltage is changed in accordance with an external-control voltage input at an external-control terminal.
Dependencies are inferred from the claim text.