Time modulation &amp;#x2014; The exponential way

Bartholomeusz

2013 Proceedings of the ESSCIRC (ESSCIRC)

et al. 2013

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Switch-mode power supplies have become the premier choice for LED backlighting applications. This paper introduces a new current-mode floating buck controller architecture, used for driving constant current through a string of LEDs. Unlike state-of-the-art controllers, this architecture is based on fixed peak current and variable OFF time as the current control method. An innovative time modulator is added to provide a constant feedback loop response regardless of external components. The proposed controller architecture is designed, implemented in a 0.5µm CMOS process and its performances are validated by simulations and measurements.

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Variable off time current-mode floating buck controller - A different approach

Bartholomeusz

2013 Proceedings of the ESSCIRC (ESSCIRC)

et al. 2013

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Forcing the limits — Peak voltage extension for floating buck controller

International Symposium on Signals, Circuits and Systems ISSCS2013

Brezeanu

2013

A solution for increasing a current mode floating buck controller's versatility, through the use of a peak voltage extension block, is investigated, implemented and its performances are measured. Most current controller architectures have limitations that impose harsh application-constraints. This paper proposes a new method of reducing those limitations by allowing precise, linear, external control of the peak voltage threshold. The solution is especially useful in applications where each instance of the buck controller needs to be individually adjusted to meet specifications.

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Overcoming leakage current by output precharging in error amplifiers

Bartholomeusz

CAS 2012 (International Semiconductor Conference)

et al. 2012