87%-Efficient 330-mW 0.6-&lt;italic&gt;μ&lt;/italic&gt;m Single-Inductor Triple-Output Buck–Boost Power Supply

Solis, Carlos J.; Rincón-Mora, Gabriel A.

doi:10.1109/tpel.2017.2756636

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…Otherwise, CR appears in CH 2 . A solution of CR reduction is to use CBC [1, 2]

({, \begin{aligned} \sum_{n = 1}^{N} i_{c (⟩⟨, n)} = i_{normalLA} \\ d_{(⟩⟨, n)} |_{n \in falsefalse{1, N - 1 falsefalse}} = \frac{i_{c (⟩⟨, n)}}{i_{normalLA}}; d_{⟨n⟩} = 1 - {false\sum}_{n = 1}^{N - 1} d_{(⟩⟨, n)} \end{aligned})

where i c〈 n 〉 is control signal of CH 〈 n 〉 . However, when considering inductor current sensing error i os and dynamic tracking error i err , the instant output current of CH N is rewritten as

i_{o N} = d_{N} \cdot i_{normalLA} = \frac{i_{normalLA} - \sum_{n = 1}^{N - 1} i_{normalc ⟨n⟩}}{i_{normalLA} + i_{normalos}} \cdot i_{LA} = \frac{i_{normalc N} - i_{err}}{i_{LA} + i_{os}} i_{normalLA} \neq i_{c N}

…”

Section: Existing Methodsmentioning

confidence: 99%

Single‐inductor multiple‐output DC–DC converter with duty‐cycle‐constrained comparator control

Chen

Leung

et al. 2019

Electron. lett.

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An auto-buck-boost single-inductor multiple-output (SIMO) dc-dc converter with duty-cycle-constrained comparator control is presented in this Letter. Combined both comparator-based and duty-cycle-constrained controllers enable the dc-dc converter attaining fast transient response and low cross-regulation (CR). The proposed algorithm is independent of the precision of current sensor and suppresses CR robustly with the proposed tri-feedback loop control of comparatorbased voltage control, duty-cycle-constrained distribution and average current control. The proposed scheme is suitable for autobuck-boost SIMO dc-dc converter design for dynamic voltage scaling applications.

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“…Otherwise, CR appears in CH 2 . A solution of CR reduction is to use CBC [1, 2]

({, \begin{aligned} \sum_{n = 1}^{N} i_{c (⟩⟨, n)} = i_{normalLA} \\ d_{(⟩⟨, n)} |_{n \in falsefalse{1, N - 1 falsefalse}} = \frac{i_{c (⟩⟨, n)}}{i_{normalLA}}; d_{⟨n⟩} = 1 - {false\sum}_{n = 1}^{N - 1} d_{(⟩⟨, n)} \end{aligned})

i_{o N} = d_{N} \cdot i_{normalLA} = \frac{i_{normalLA} - \sum_{n = 1}^{N - 1} i_{normalc ⟨n⟩}}{i_{normalLA} + i_{normalos}} \cdot i_{LA} = \frac{i_{normalc N} - i_{err}}{i_{LA} + i_{os}} i_{normalLA} \neq i_{c N}

…”

Section: Existing Methodsmentioning

confidence: 99%

Single‐inductor multiple‐output DC–DC converter with duty‐cycle‐constrained comparator control

Chen

Leung

et al. 2019

Electron. lett.

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“…1 with two outputs), are determined by the closed-loop PWM controller with stability compensation and smallsignal bandwidth limitation that is typically limited to one-fifth of the switching frequency. Current-mode hysteretic control [4,5] also relies on an error amplifier with small-signal bandwidth limitations. Due to the limited bandwidth, it takes time for the controller to respond to any load transient event to adjust the duty-cycle for the new steady-state and rebalance the current distribution to the outputs.…”

mentioning

confidence: 99%

“…The cross-regulation will be more significant at heavy load conditions because the controllers were designed to handle crossregulations only up to a certain current level, and the interruption in control timing and current delivery will result in larger voltage fluctuations. As a result, the maximum output current capacity per output for SIMO converters is limited typically well below 1 A [1][2][3][4][5][6][7][8].…”

mentioning

confidence: 99%

Voltage‐mode hysteretic control techniques for high‐current single‐inductor multiple‐output switching regulators

Huang¹,

Lee²

2020

Electron. lett.

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In this Letter, two comparator-based voltage-mode hysteretic controller designs are proposed to enhance dynamic response for single-inductor multiple-output (SIMO) switching converters to minimise over-/ under-shoot voltages due to self-and cross-regulations in fast load transients, especially with high output power and large current steps. The proposed converters are designed and simulated in a 65 nm CMOS process with standard I/O devices. With the proposed techniques, the output voltage fluctuations, including steady-state voltage ripples and over-/under-shoot voltages due to self-and crossregulations during a 1.8 A load transient in 1 ns, are kept within 60 mV. The proposed converter delivers more than 3 A maximum load current per output and a maximum total output power above 6 W, with a peak efficiency above 90%. Compared to state-of-the-art SIMO converters, this work achieves a significantly higher output power capacity and faster dynamic response thus smaller self-and cross-regulations within 0.033 mV/mA.

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“…Generally, it is desirable for all LED drivers to be highly power-efficient. This power-efficiency is highly imperative in automotive applications as the automotive is highly resource-constraint, including the often fully loaded battery (and alternator) [68][69][70].…”

Section: Power-efficiencymentioning

confidence: 99%

Design and realization of high-performance LED drivers for automotive lighting applications

Qu¹

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This Ph.D. program pertains to the design and monolithic realization of Light Emitting Diode (LED) drivers for automotive lighting where the imperative parameters are high power-efficiency and high reliability. The grand objectives thereto are substantial improved specifications over the state-of-the-art, including power-efficiency, reliability, current driving capability, and dimming range. To achieve the said grand objectives, the specific objectives are to decouple, and hence mitigate the following two major design trade-offs that limit the performance of contemporary automotive LED drivers. The first trade-off is between high reliability and high current driving capability, and applies to both single-phase and multi-phase LED drivers. Specifically, to achieve high current driving capability, the contemporary single-phase LED driver typically suffers from low reliability arising from large current ripples. On the other hand, the multi-phase LED driver is highly advantageous to provide high current driving capability, but suffers from low reliability because of the ensuing subharmonic oscillation. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel Pulse-Width-Modulation (PWM)-based dual-phase LED driver in Global Foundries (GF) 130nm BCDLite process. To achieve high current driving capability, we adopt a dual-phase power stage. To achieve high reliability, we propose an Average Current Control to eliminate the subharmonic oscillation by considering the complete inductor-current profile vis-à-vis peak current adopted/reported elsewhere. To further improve the reliability, we propose an accuracy-enhanced current sensor to ascertain good current balance in the adopted dual-phase power stage. With measurements on our prototype LED driver ICs embodying our aforesaid adoption and vi proposed circuits, we demonstrate, to the best of our knowledge, for the first time that the trade-off between high reliability and high current driving capability is decoupled, i.e., an LED driver uniquely featuring high reliability, yet high current driving capability. The second trade-off is between high power-efficiency and wide dimming range. Specifically, a wide dimming range is derived by means of high switching frequency, hence the ensuing reduced settling time of the LED current. This, however, in turn leads to a degradation of the power-efficiency due to increased switching losses. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel fully soft-switched LED driver in GF 130nm BCDLite process. We achieve wide dimming range by operating at high switching frequencies, but the high switching does not compromise the power-efficiency. Using a fully soft-switching approach, the ensuing switching losses are negligible. This is achieved by a proposed Hysteretic Soft-Switching Controller (HSSC) and proposed circuitries, i.e., a voltage detector, current sensor, and a level shifter. The HSSC enables complete soft-switching, including zerovoltage switc...

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87%-Efficient 330-mW 0.6-<italic>μ</italic>m Single-Inductor Triple-Output Buck–Boost Power Supply

Cited by 7 publications

References 20 publications

Single‐inductor multiple‐output DC–DC converter with duty‐cycle‐constrained comparator control

Single‐inductor multiple‐output DC–DC converter with duty‐cycle‐constrained comparator control

Voltage‐mode hysteretic control techniques for high‐current single‐inductor multiple‐output switching regulators

Design and realization of high-performance LED drivers for automotive lighting applications

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