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Method to improve the peak-current limit in a slope-compensated, current- mode DC/DC converter, and circuit therefor
Method to improve the peak-current limit in a slope-compensated, current- mode DC/DC converter, and circuit therefor
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机译:改善斜率补偿的电流模式dc / dc转换器中的峰值电流限制的方法及其电路
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摘要
A method and circuit for modifying the clamping level (VCLAMP) of the error signal voltage (VERROR), which clamp in turn limits the peak current in the inductor of a slope-compensated, current mode DC/DC converter. VCLAMP may be modified and/or variable such that it is a function of average current in the inductor, peak current in the inductor, the converter duty cycle and/or the level of slope compensation used in the converter. The modification of VCLAMP may result in the peak current limit being independent of the converter duty cycle and/or the level of slope compensation used in the converter. Further, the modification of VCLAMP does not compromise the operational stability of the converter which is achieved by the use of a slope compensation. In addition, the clamping of the error signal before slope compensation rather than after slope compensation avoids instability at high duty cycles.
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