Robust and efficient synchronous buck converter with near-optimal dead-time control

Lee, Sung‐Woo; Jung, Seungchul; Huh, Jin Woo; Park, Changbyung; Rim, Chun T.; Cho, Gyu‐Hyeong

doi:10.1109/isscc.2011.5746366

Cited by 30 publications

(12 citation statements)

References 6 publications

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“…Among these, the power losses associated with the switching node and dead-time take up larger portion of the total power loss only when is relatively small. However, switching loss in the light condition is effectively reduced with the proposed scheme explained in Section V. In addition, the power loss associated with dead-time can be decreased by using pre-reported dead-time controllers [9], [10]. On the other hand, the power loss associated with the power transistors could affect the power efficiency considerably not only in the light condition but also in the heavy condition.…”

Section: Concept Of the Proposed Mpltmentioning

confidence: 99%

“…Therefore, to find the condition for changing from 1 to 0, (7) has to be modified to contain the term. By substituting the of (3) of for that of (7), (7) is modified as (8) By extracting the square root value of (8) and multiplying the term of to both sides of the equation, the condition for changing from 1 to 0 is approximately given by (9) Though the square root of 3.5 is somewhat larger than 1.75, the factor of 1.75 is selected to generate a dead zone that prevents the repetition of two conditions of changing from 0 to 1 and from 1 to 0. Moreover, the factor of 1.75 can be easily implemented at the circuit level because 1.75 is half of 3.5.…”

Section: Changing Conditionsmentioning

confidence: 99%

“…Moreover, the factor of 1.75 can be easily implemented at the circuit level because 1.75 is half of 3.5. The term of was multiplied in (9) to make the respective terms of (9) similar to the term shown on the left side of (7).…”

Section: Changing Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Inverting Buck-Boost DC-DC Converter for Mobile AMOLED Display Using Real-Time Self-Tuned Minimum Power-Loss Tracking (MPLT) Scheme With Lossless Soft-Switching for Discontinuous Conduction Mode

Hong

Park

Kong

et al. 2015

IEEE J. Solid-State Circuits

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A DC-DC converter, which tracks minimum power loss under various conditions, is presented in this paper. With this DC-DC converter, a new approach for optimum efficiency, which implements theoretical equations intactly at the circuit level, was adopted. This approach has high reliability against process variation. The concept of lossless soft-switching was also adopted in discontinuous-conduction-mode (DCM) operation. The proposed DC-DC converter has a maximum power efficiency of 91% at the switching frequency of 1 MHz. The proposed converter is able to maintain a maximum power efficiency of around 90% over the whole range of input voltage from 2.9 to 4.5 V and output voltage from 3.8 to 5.9 V. This chip is implemented in a 0.35 m BCD process and occupies an area of 2.1 1.4 mm .Index Terms-DC-DC power conversion, inverting buck-boost converter, minimum power-loss tracking, negative voltage generator, real-time operation. 0018-9200

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Section: Concept Of the Proposed Mpltmentioning

confidence: 99%

Section: Changing Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Inverting Buck-Boost DC-DC Converter for Mobile AMOLED Display Using Real-Time Self-Tuned Minimum Power-Loss Tracking (MPLT) Scheme With Lossless Soft-Switching for Discontinuous Conduction Mode

Hong

Park

Kong

et al. 2015

IEEE J. Solid-State Circuits

Self Cite

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“…Lee et al [13] report an on/off dead-time control scheme. It uses two inner dead-time integral feedback control loops for on and off dead-times, respectively, and an external voltage regulation loop.…”

Section: Prior Art On Dead-time Controlmentioning

confidence: 99%

High efficiency DCM buck converter with dynamic logic based adaptive switch-time control

Manohar

Balsara

2015

Analog Integr Circ Sig Process

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This paper presents a dynamic logic based adaptive switch-time control circuit (DASTC) for fast control to minimize body diode conduction losses and dead-time of a buck regulator operating in discontinuous conduction mode. Dead-time is an important metric for improving efficiency of low voltage converters. DASTC provides instant sensing and feedback based on the load to minimize dead-time significantly compared to prior-art and scales low side power switch pulse width adaptively across load currents, just enough to discharge the stored inductor energy fully. Furthermore, the converter has inherent pulse skipping mode to lower the switching frequency at light loads to enhance light load efficiency. The proposed 1.5 V buck regulator was fabricated in 0.35 lm CMOS process with an input voltage range of 1.8-3 V and load current range of 1-200 mA. Measurement results demonstrate a peak power efficiency of 94.6 % and a high overall power efficiency ( [*89 %) for load currents greater than 5 mA for V IN = 1.8 V. The proposed scheme achieves 49 (*5 ns) better dead-time and 4-5.5 % better power efficiency compared to prior-art over the load current range.

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“…Some require high-gain, highspeed amplifier to attain accurate dead-time control. For the purpose of getting 10-ns resolution for the dead-time control, the adaptive control circuit should have less than 10-ns response time, which is not easy to achieve [3]- [6]. In order to mitigate these effects, a sampling and holding idea is proposed [7], whereby low-speed circuit was engaged to perform high-speed control.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Dead-Time Control Driver for Buck Regulator

Goh

Kok

et al. 2016

IEEE Trans. VLSI Syst.

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This brief presents an asymmetrical dead-time control driver (ASDTCD) for synchronous buck converter operating in the continuous conduction mode. Dead-time control is an important metric for improving the efficiency of switching mode power regulator. Without an additional circuit, the proposed ASDTCD can generate dead time by controlling the slope for the output signal of the driver. The proposed ASDTCD utilizes the transition between triode region and saturation region for the power transistor to avoid body-diode conduction and shoot-through current while minimizing the switching loss. Thus, highspeed body-diode conduction sensor is avoided; thereby, reducing the power consumption and saving silicon area. In addition, the body-diode conduction time control accuracy is also enhanced. Less than 1-ns body-diode conduction time has been achieved without bringing in shootthrough current across 10-450-mA load range. With less than 0.5% of the total input power consumed, the proposed ASDTCD takes less than 1% of the power transistor area. This design is implemented in the 0.18-µm CMOS process.

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Robust and efficient synchronous buck converter with near-optimal dead-time control

Cited by 30 publications

References 6 publications

Inverting Buck-Boost DC-DC Converter for Mobile AMOLED Display Using Real-Time Self-Tuned Minimum Power-Loss Tracking (MPLT) Scheme With Lossless Soft-Switching for Discontinuous Conduction Mode

Inverting Buck-Boost DC-DC Converter for Mobile AMOLED Display Using Real-Time Self-Tuned Minimum Power-Loss Tracking (MPLT) Scheme With Lossless Soft-Switching for Discontinuous Conduction Mode

High efficiency DCM buck converter with dynamic logic based adaptive switch-time control

Asymmetrical Dead-Time Control Driver for Buck Regulator

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