Fast‐transient DC‐DC converter using a high‐performance error amplifier with a rapid output‐voltage control technique

Javed, Khurram; Yeo, Jaejin; Lee, Jae‐Seong; Roh, Jeongjin

doi:10.1002/cta.2329

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…The enlarged view of the small triangle (small Δ) and large triangle (large Δ) are shown in Figure 9B,C. The computations of small Δ and large Δ are described in ( 7) to ( 8) and ( 9) to (10), respectively. m 1 and m 2 indicate the rising and falling slopes of inductor current.…”

Section: Determination Of the Small Triangle And Large Trianglementioning

confidence: 99%

“…Thus, the duty ratio can be saturated during the transient period to effectively shorten the response time. Alternatively, the dual-mode control strategy [7][8][9][10][11][12][13][14][15][16][17][18][19][20] is quite popular, especially for a digitally controlled power converter to enhance its transient response. Among the dual-mode controls, charge balance control (CBC) is one of the most prominent strategies that is widely implemented.…”

Section: Introductionmentioning

confidence: 99%

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Auto‐tuning charge balance control for improving transient response on buck converter

Liu

Chen

Chang-Chien

2020

Circuit Theory & Apps

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Load transient and dynamic voltage scaling (DVS) are commonly seen in the operation of the system processor. These two functions usually encounter large output voltage transient, which is hard to be quickly settled. Charge balance control is one of the prior choices that enables the converter to operate at its optimal charge/discharge slew rate so as to achieve fast transient response.The effectiveness of the optimal performance generally requires precise knowledge of the circuit parameters for charge balance computation. However, parameter drifting due to the manufacturing process may affect the performance, which is hard to implement a power integrated circuit (IC) for wide range applications. Different from the original approaches, this paper proposes an auto-tuning charge balance control (AT-CBC) to optimize load transient response and DVS of the buck converter. The auto-tuning mechanism can save the preknowledge of the output filter and avoid complex calculation in digital control. The function of AT-CBC is validated by a field-programmable gate array (FPGA) controlled buck converter. Experimental result shows that the output voltage can be settled within 3 μs for the 750-mA load step transient. For the 0.3-V DVS transient, the output voltage can be settled within 4 μs. K E Y W O R D Sauto-tuning, charge balance control (CBC), dynamic voltage scaling (DVS), digital control, DC-DC converter

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Section: Determination Of the Small Triangle And Large Trianglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Auto‐tuning charge balance control for improving transient response on buck converter

Liu

Chen

Chang-Chien

2020

Circuit Theory & Apps

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“…Besides the TOC control scheme, some topology-modification schemes are proposed to improve the load transient response. In Javed et al, 16 a multiphase buck converter with a combination of two different amplifiers to replaces the conventional error amplifier, achieving a high loop gain and high slew rate. In other studies, [17][18][19] multiphase buck converter with coupled inductors can respond faster to load transient.…”

Section: Introductionmentioning

confidence: 99%

Auxiliary bridge arm–based switching control for optimal unloading transient performance of multiphase buck converters

2020

Circuit Theory & Apps

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For a low-conversion ratio buck converter, the step-down (unloading) transient lasts much longer than the step-up transient for the same change of the load. Regarding this issue, an auxiliary bridge arm (ABA) multiphase buck converter with switching control scheme is proposed for the optimal unloading transient performance. With the ABA, the input voltage is reversely connected into the inductor current freewheeling loop during the unloading transient. In this case, the fall slew rate of the inductor current increases, because of the voltage across the inductor increase. Meanwhile, the capacitor-charge balance theory is used to calculate the switching moment and achieve the minimum settling time and the voltage overshoots. Finally, a 12-to 3.3-V two-phase synchronous buck converter prototype is built. The experimental results show that the settling time and the voltage deviation are both improved over 50% compared with that of the average current sharing scheme and the time-optimal control scheme.auxiliary bridge arm (ABA), multiphase buck converter, switching control, unloading transient performance | INTRODUCTIONThe microprocessors and digital signal processors have posed stringent requirements for its power supplies with low output voltage, high output current, and fast dynamic performance. 1 Multiphase synchronous buck converters are widely used in these applications, 2-4 because of its inherent advantages over single-phase buck converters. However, for a low-conversion ratio buck converter, the inductor current fall rate is much smaller than the rise rate. Accordingly, the step-down transient lasts much longer than the step-up transient for the same load change, and the voltage overshoot is larger than the voltage undershoot. The large voltage overshoot reduces reliability, and long setting time degrades performance. Regarding this issue, some efficient methods have been proposed to pursuit a fast load-transient response by optimizing control strategy or topological structure during the unloading transient.In previous studies, 5-12 various control methods with fast load response are reported in multiphase buck converters, such as ripple control, 5,6 hysteretic control, 7,8 sliding-mode control, 9,10 and adaptive voltage position control. 6,11,12 These control schemes could achieve the system steady-state performance well. With the constant control structure and parameters in transient and steady states, the optimal transient performance cannot be guaranteed especially when a relatively large load transient occurs. For this reason, the time-optimal control (TOC) 13-15 is provided for multiphase

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“…Also, the design complexity of a DC-DC converter is much higher than that of a linear regulator. The use of a linear regulator for power management affords design simplicity, less silicon area, low cost, and no ripple [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Two-Module Linear Regulator with 3.9–10 V Input, 2.5 V Output, and 500 mA Load

Duan

Huang

et al. 2019

Electronics

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A linear regulator with an input range of 3.9–10 V, 2.5 V output, and a maximal 500 mA load for use with battery systems was developed and presented here. The linear regulator featured two modules of a preregulator and a linear regulator core circuit, offering minimized power dissipation and high-level stability. The preregulator delivered an internal power voltage of 3 V and supplied internal circuits including the second module (the linear regulator core). The preregulator fitted with an active, low-pass filter provided a low-noise reference voltage to the linear regulator core circuit. To ensure operational stability for the linear regulator, error amplifiers incorporating the Miller compensation technique and featuring a large slewing rate were employed in the two modules. The circuit was successfully implemented in a 0.25 µm, 5 V complementary metal-oxide semiconductor (CMOS) process featuring 20 V drain-extended MOS (DMOS)/bipolar high-voltage devices. The total silicon area, including all pads, was approximately 1.67 mm2. To reduce chip area, bipolar rather than DMOS transistors served as the power transistors. Measured results demonstrated that the designed linear regulator was able to operate at an input voltage ranging from 3.9 to 10 V and offer a maximum 500 mA load current with fixed 2.5 V output voltage.

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Fast‐transient DC‐DC converter using a high‐performance error amplifier with a rapid output‐voltage control technique

Cited by 4 publications

References 12 publications

Auto‐tuning charge balance control for improving transient response on buck converter

Auto‐tuning charge balance control for improving transient response on buck converter

Auxiliary bridge arm–based switching control for optimal unloading transient performance of multiphase buck converters

A Two-Module Linear Regulator with 3.9–10 V Input, 2.5 V Output, and 500 mA Load

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