Ics laboratory chern lin chen max duty cycle

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Unformatted text preview: 積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 LEB Timer 5V LEB TIMER IPD M4 H/L M1 M2 M3 C Gate drive low – M4 holds C at 5V, M1 shuts off pulldown current Gate drive high – M4 turns off, M3 ramps C to 2.5V in around 200ns 31 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Minimum On Time switch delay & fall time leading edge blanking turn-off propagation delay 32 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 Multi Control Loops VDD UVLO RI OSC Green Mode GND FB SQ R OCP Gate Driver OUT Current-loop LEB SENSE Voltage-loop 33 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Peak Current Mode Control VDD UVLO RI OSC Green Mode GND FB SQ R OCP Gate Driver OUT Current-loop SENSE LEB Voltage-loop 34 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Inherent Short Circuit Protection iP iS OCP Limit or maximum duty minimum ON time iP di p vdc = dt Lp iS dis vO + vF = dt Ls 35 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Over Current Protection VDD UVLO RI OSC Green Mode GND FB SQ R Gate Driver OCP LEB SENSE OUT vO is 36 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Concept of Slope Compensation feedback signal switch current PWM output compensated slope combined slope 37 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Reducing Current Loop Gain CS signal Gate drive Original With slope compensation 38 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Signal Path VDD UVLO RI OSC Green Mode GND FB SQ R OCP Gate Driver OUT Current-loop SENSE LEB SC + Voltage-loop 39 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 Turn-Off Saturation di L VDC = dt L vDC drops → D increases → Toff decreases→ core reset fails 40 National Taiwan University 國立台灣大學 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Ch...
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This note was uploaded on 10/16/2010 for the course GRADUATE I Power IC taught by Professor Chern-linchen during the Fall '09 term at National Taiwan University.

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