06-Switching Basics - DC/DC Basics Chern-Lin Chen ( )...

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Chern-Lin Chen ( ) Department of Electrical Engineering & Graduate Institute of Electronics Engineering National Taiwan University e-mail - clchen@cc.ee.ntu.edu.tw office tel – +886-2-3366-3575 DC/DC Basics Mar. 30, 2010
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1 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Switch-Mode Operation power MOS OFF, in cutoff (open) – tiny i d ON, in triode (R ds,on ) – low v ds
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2 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Power MOS Action V GS V DS V GS t ON ON OFF OFF V DS t triode triode cutoff
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3 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Switching Transients V GS V DS V GS t ON ON OFF OFF V DS t triode triode cutoff hard switching soft switching
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4 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Buck Converter
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5 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 N or P MOS ? driving voltage mobility/size
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6 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Continuous Conduction Mode (V d -V o )T on =V o T off Vd charges L i L supplies V O L discharges to V O on od on off on on off T VV TT T D = + = +
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7 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Discontinuous Conduction Mode i L drops to zero ?
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8 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 CCM/DCM Boundary i L t i o
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9 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Lower i o at CCM/DCM Boundary i L t i o increase L increase fs
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10 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Dynamics of Load Changing feedback controller D = V o /V d at CCM (steady state) D < V o /V d during load decreasing transients D > V o /V d during load increasing transients t i i L i o1 i o2 i o
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11 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Output Voltage Ripple KCL charge balance
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12 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Ideal Buck CCM Waveforms i D L Q V d C O R v Q 0 t v L 0 t V d V O ( V O + V F ) t on t off i Q 0 t i D 0 t i L 0 t i Co 0 t V d i L I L =I O
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13 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Boost Converter V o = V d /(1 - D) V d charges L C supplies V O L discharges V d -i L supplies V O i L charges C V d T on =(V o -V d )T off
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06-Switching Basics - DC/DC Basics Chern-Lin Chen ( )...

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