| US 7,595,620 B2 | ||
| Switching regulator | ||
| Masaru Sakai, Kyoto (Japan); Kiyotaka Umemoto, Kyoto (Japan); and Shogo Hachiya, Kyoto (Japan) | ||
| Assigned to Rohm Co., Ltd., Kyoto (Japan) | ||
| Appl. No. 10/598,897 PCT Filed Mar. 09, 2005, PCT No. PCT/JP2005/004055 § 371(c)(1), (2), (4) Date Sep. 14, 2006, PCT Pub. No. WO2005/088818, PCT Pub. Date Sep. 22, 2005. |
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| Claims priority of application No. 2004-074568 (JP), filed on Mar. 16, 2004; application No. 2004-297961 (JP), filed on Oct. 12, 2004; and application No. 2005-063821 (JP), filed on Mar. 08, 2005. | ||
| Prior Publication US 2007/0182395 A1, Aug. 09, 2007 | ||
| Int. Cl. G05F 1/56 (2006.01) | ||
| U.S. Cl. 323—283 [323/288; 363/79] | 3 Claims |
| 1. A switching regulator comprising:
a DC-DC converter that includes a switching device and that is arranged to provide an output voltage;
a control signal generating circuit arranged to generate a pulse signal as a control signal corresponding to the output voltage
of the DC-DC converter and arranged to generate a reference voltage that varies with the pulse signal of the control signal
generating circuit and is in substantially opposite phase to the output voltage of the DC-DC converter, wherein the control
signal generating circuit comprises:
a comparator to compare a voltage based on the output voltage of the DC-DC converter with the reference voltage;
a flip-flop set arranged to be set by an output of the comparator; and
a pulse control circuit arranged to reset the flip-flop when a predetermined on-period elapses after a rise of an output pulse
of the flip-flop;
wherein the control signal generating circuit is arranged to provide the output pulse of the flip-flop as a control signal
for the switching device;
wherein the switching regulator further comprises a driver circuit arranged to drive the switching device based on the control
signal; and
wherein the driver circuit comprises an output terminal via which a signal based on an inverted signal of the control signal
is outputted, the switching regulator further comprises a constant voltage source and a resistor that has one end thereof
connected to the output terminal of the driver circuit via which the signal based on the inverted signal of the control signal
is outputted and that has another end thereof connected to an output terminal of the constant voltage source, and a voltage
at a node between the constant voltage source and the resistor is the reference voltage.
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