| US 7,486,064 B2 | ||
| Under voltage lock out circuit and method | ||
| Yoshikazu Sasaki, Kyoto (Japan); Tetsuro Hashimoto, Kyoto (Japan); and Isao Yamamoto, Kyoto (Japan) | ||
| Assigned to Rohm Co., Ltd., (Japan) | ||
| Filed on May 07, 2007, as Appl. No. 11/800,644. | ||
| Claims priority of application No. JP2006-129866 (JP), filed on May 09, 2006. | ||
| Prior Publication US 2007/0263419 A1, Nov. 15, 2007 | ||
| Int. Cl. H02H 3/24 (2006.01); G05F 5/00 (2006.01) | ||
| U.S. Cl. 323—299 [323/276; 323/281; 323/901; 361/92] | 15 Claims |
| 1. An under voltage lock out circuit which monitors an input voltage and executes a predetermined sequence when the input
voltage satisfies a predetermined condition; the under voltage lock out circuit comprising:
a voltage comparison unit which compares the input voltage and a predetermined threshold voltage, and outputs a comparison
signal;
a sequence circuit which receives the comparison signal output from the voltage comparison unit and a start-up signal instructing
start-up of an equipment mounted with the under voltage lock out circuit, and executes a predetermined sequence when start-up
is instructed by the start-up signal in a state the input voltage is higher than the threshold voltage; and
a voltage control unit which switches the threshold voltage based on the comparison signal and the start-up signal.
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