Accuracy Analysis of Constant-On Current-Mode DC-DC Converters for Powering Microprocessors

Song, Chunping

doi:10.1109/apec.2009.4802639

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…When Vfb is lower than Vref,WT, MP is turned on again. Equations ( 5) and (6) show that the voltage across the inductor is affected by the parasitic resistances. In a steady state, the summation of Equations ( 5) and ( 6) is equal to zero.…”

Section: Adaptive On-time Buck Converter With the Wave Tracking Refer...mentioning

confidence: 99%

“…Not only are compensation components needed but the transient response of the DC-DC converter is also restricted. In recent years, a ripple-based constant on-time (RBCOT) control scheme for buck converters, as shown in Figure 1, has received wide attention because of its simple structure, good light-load efficiency, and fast load transient response [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Liu

Kuo

2021

Energies

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A ripple-based constant on-time (RBCOT) buck converter with a virtual inductor current ripple (VICR) control can relax the stability constraint of large equivalent series resistance (ESR) at an output capacitor, but output regulation accuracy deteriorates due to the issue with output DC offset. Thus, this paper proposes a wave tracking reference (WTR) control to improve converter stability with low ESR and concurrently eliminate output DC offset on the regulated output voltage. Moreover, an adaptive on-time (AOT) circuit is presented to suppress the switching frequency variation with load current changes in continuous conduction mode. A prototype chip was fabricated in 0.35 µm CMOS technology for validation. The measurement results demonstrate that the maximum output DC offset is 4.1 mV and the output voltage ripple is as small as 3 mV. Furthermore, the switching frequency variation with the AOT circuit is 11 kHz when load current changes from 50 mA to 500 mA, and the measured maximum efficiency is 90.9% for the maximum output power of 900 mW.

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Section: Adaptive On-time Buck Converter With the Wave Tracking Refer...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Liu

Kuo

2021

Energies

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“…However, current sensing is more complex than voltage sensing. Therefore, many methods have been proposed to get the inductor current [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…In [14], the current sensing method uses a resister to get the inductor current information (Fig. 3).…”

Section: Introductionmentioning

confidence: 99%

A Novel Control Method for Buck Converters

Chou,

Chen

2024

Preprint

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This paper presents an innovative control technique for buck converters. This control strategy is applied to the switch-inductor converter. It has the following features: (a) the dual loop control mechanism results in the high transient responses , (b) the near-constant switching frequency reduces the design effort of front-end EMI filters, (c) the adaptive on time control minimizes the over-shoot/undershoot, (d) from the viewpoint of circuit integration because the proposed circuit requires no special processes to fabricate. Therefore, it is low cost and suitable for mass production. This paper first describes the advantages and disadvantages of the various types of buck converters. Then, the operation of the proposed scheme is analyzed and explained further. The control scheme is verified by the SIMPLIS simulator and can be fabricated by UMC 0.18μm 1P6M CMOS processes in future.

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“…However, it suffers from the subharmonic stability due to the lagging phase of the output voltage ripple relative to the inductor current ripple. The second is the output DC offset problem [20]. The COT converters generally adopt the valley voltage control, and the valley of the output voltage is regulated to the preset voltage.…”

Section: Introductionmentioning

confidence: 99%

A Pseudo-Constant Frequency Constant On-Time Buck Converter With Internal Current Ripple Injection and Output DC Offset Cancellation

Sun

et al. 2019

IEEE Access

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A constant on-time buck converter with internal inductor current synthesizer and output DC offset cancellation technique is proposed. A fully integrated inductor current synthesizer based on valley voltage detector is employed to avoid system instability for constant on-time converters with low-ESR output capacitors. Moreover, the valley voltage detector could shift the emulated inductor current signal to zero valley level. In this way, the output DC offset due to ripple injection variation could be eliminated. An on-time circuit with comparator delay compensation is presented to alleviate the switching frequency variation. The small-signal model and design criteria are derived for system stability design. The circuit has been implemented with 0.18 µm BCD process. The measurement results show that the transient response is about 15.4 µs and the overshoot or undershoot voltage is less than 36 mV when the load transient between 1 A and 5 A for input voltage of 12 V and output voltage of 1.05 V. The switching frequency across load variation f SW / I LOAD is 4.6 kHz/A at the nominal frequency of 700 kHz. The output DC offset is less than 10 mV in case of 4 A load current change. INDEX TERMSConstant on-time control, emulated inductor current synthesizer, ripple-based converter, switching frequency, valley voltage detector.

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Accuracy Analysis of Constant-On Current-Mode DC-DC Converters for Powering Microprocessors

Cited by 13 publications

References 5 publications

Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

A Novel Control Method for Buck Converters

A Pseudo-Constant Frequency Constant On-Time Buck Converter With Internal Current Ripple Injection and Output DC Offset Cancellation

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