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US 2011/0215786 A1Published application
On-off timer circuit for use in dc-dc converter
AssigneesPanasonic Corporation, Panasonic Semiconductor Asia Pte., Ltd.
InventorsTakuya ISHII, Chun Kiong Leslie KHOO, Ulysses Ramos LOPEZ, Gin Kooi LIM, Khairullah Bin ZAYADI
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Abstract
An ON-OFF timer circuit for use in a DC-DC converter to minimize or eliminate the risk of developing sub-harmonic oscillations that may cause the dc-dc system to be unstable is presented. The apparatus controls and limits the ‘On’ time duration and ‘Off’ time duration within one pulse cycle.
Claims13
An ON-OFF timer circuit for use in a DC-DC converter comprising:
- an Off-Timer to keep the Off duration constant;
- an On-Timer to limit the On duration so as not to exceed a pre-determined time limit;
- and
- a flip-flop operable to generate a first level signal and a second level signal from its output for controlling said Off duration and On duration.
1 more element
Dependencies are inferred from the claim text.