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To efficiently power multi-core processors in today's computing devices, integrated voltage regulator (IVR) shows significant energy saving ability by dynamic voltage and frequency scaling. One key aspect in developing IVR is to design power inductors with small size and small loss at very high frequency. However, the challenge in very high frequency magnetic characterization is a major obstacle to...
Multi-phase constant on-time current mode control based on pulse distribution structure is widely used in Voltage Regulator application for microprocessor. To minimize ripple cancellation effect, external ramp compensation is used in commercial products. However, external ramp will introduce dynamic to the system and AVP requirement will be violated without considering its effect. This paper first...
Recently, capacitor current ramp compensation, which features fastest transient response, has been proposed to stabilize V2 control with low equivalent-series-resistance (ESR) capacitor. However, it is found that the design of capacitor current sensing gain and the time-constant mismatch of sensing network may lead to oscillatory or slow transient response, so both issues are investigated in this...
A new equivalent circuit model is presented to predict the small-signal characteristic of current-mode control with DCR current sensing accurately, and a simple auto-tuning method is proposed to solve the issue of time constant mismatch in DCR current sensing. The model shows that the mismatch between the current sensing RC network and the output inductor makes the output impedance deviate away from...
V2 control and its variety named ripple-based control, are popular control schemes in point-of-load Buck converters and Voltage Regulators for microprocessor. This control scheme is elegant when output capacitors with sufficient ESR are employed, such as OSCON capacitors. However, in most cases with small-ESR capacitors, such as ceramic capacitors, instability problem will occur. Up to now, no equivalent...
V2 control is a popular control architecture in point-of-load Buck converters due to its simplicity and fast transient response. V2 control with ceramic capacitor has instability issue. This paper reviews the existing solutions and their limitations are studied. A solution using output capacitor current ramp to stabilize the control loop is proposed. The analog capacitor current sensing method based...
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