Class presentation davood amerion university of tehran 28 december 2006
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A CMOS-Control Rectifier for Discontinuous Conduction Mode Switching DC-DC Converters ISSCC 2006 / SESSION 19 / ANALOG TECHNIQUES / 19.8 Tsz Yin Man, Philip K.T. Mok and Mansun Chan. Class presentation: Davood Amerion University of Tehran 28 December 2006. Preliminary.

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Class presentation davood amerion university of tehran 28 december 2006

A CMOS-Control Rectifier for Discontinuous Conduction Mode Switching DC-DC ConvertersISSCC 2006 / SESSION 19 / ANALOG TECHNIQUES / 19.8 Tsz Yin Man, Philip K.T. Mok and Mansun Chan

Class presentation:

Davood Amerion

University of Tehran

28 December 2006


Preliminary
Preliminary Switching DC-DC Converters


Power supply topology

Power Supply topology Switching DC-DC Converters

1- isolated

- Push-pull (Half/full bridge)

- Fly back

2- non isolated

- Buck converter

- Boost converter

- Buck-Boost converter


Boost converter 2
Boost Converter Switching DC-DC Converters[2]


Operating modes 2 discontinuous current mode continuous current mode
Operating modes Switching DC-DC Converters[2] :- Discontinuous current mode - Continuous current mode


Motivation
MOTIVATION Switching DC-DC Converters

  • The power efficiency and inductor profile of switching dc-dc converters are two of the most important issues in modern battery powered mobile systems.

  • Discontinuous-conduction mode (DCM) operation enables both a reduction in the switching losses and the use of a small inductor in the high switching frequencies (10s to 100s of MHz).

  • In this paper, a CMOS-Control Rectifier (CCR) is proposed to simultaneously provide adaptive dead time control and mV-range forward-voltage drop for sub-1V highly efficient DCM switching dc-dc converters employed in single cell battery-powered mobile systems.


Ccr diagram 1
CCR diagram Switching DC-DC Converters[1]


Results 1
Results Switching DC-DC Converters[1]

  • Technology 0.35μm 2-poly 4-metal CMOS technology.

  • 1μH inductor.

  • comparators in the proposed CCR facilitates nanosecond response times, TON (~20ns) and TOFF (~60ns)

  • the proposed CCR provides mV-range forward-voltage drop and the conduction loss is significantly lower than silicon or Schottky diodes

  • regulated output voltage of 2.5V with 100mA maximum output current. The input voltage range is from 0.9 to 1.2V.

  • a 4.7μF output capacitor and a 1μH inductor are used to facilitate the application of the entire boost converter to modern pocket-size, or even thumb-size, mobile systems.

  • Maximum power efficiency of ~ 87% is achieved at 100mA output current and 1.2V input voltage.


References
References: Switching DC-DC Converters

  • [1] ISSCC 2006 / SESSION 19 / ANALOG TECHNIQUES / 19.8 Tsz Yin Man, Philip K.T. Mok and Mansun Chan

  • [2] Texas instrument: understanding boost power stage in switchmode power supply

    application report, march 1999, SLVA061


Any question
Any question? Switching DC-DC Converters


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