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US 8,283,908 B2Granted
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 an Off duration constant;
- an On-Timer to limit an 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 an output of the flip-flop for controlling said Off duration and On duration.
1 more element
Dependencies are inferred from the claim text.