Jeffrey Hwang 10 min to design your power supply (V) 1 Design a Champion AC Adapter Jeffrey H. Hwang CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 2 CM6805/CM6806/CM6903/CM6201 Champion and FairChild Two Sources:

Jeffrey Hwang 10 min to design your power supply (V) 3 CM6805/CM6806/CM6903/CM6201 With CM6805, CM6806, CM6903 vs. CRM +PWM Cost Reduction by $0.30 to $0.20

Jeffrey Hwang 10 min to design your power supply (V) 4 CM6805/CM6806/CM6903/CM6201 If the Microprocessor Is the brain of the system, then the Power Supply is the heart.

Jeffrey Hwang 10 min to design your power supply (V) 5 CM6805/CM6806/CM6903/CM6201 High Density AC Adapter The Challenge: High Efficiency at Low Line (90VAC)

Jeffrey Hwang 10 min to design your power supply (V) 6 CM6805/CM6806/CM6903/CM6201 Typical Power vs. Efficiency

Jeffrey Hwang 10 min to design your power supply (V) 7 CM6805/CM6806/CM6903/CM6201 High Density AC Adapter

Jeffrey Hwang 10 min to design your power supply (V) 8 CM6805/CM6806/CM6903/CM6201 How to increase the Efficiency? (Rule of Thumb) Full Load due to Conduction Loss = I x I x R: 1.Spend more money to reduce R such as reduce Rdson of Mosfet 2.Reduce I by increasing VIN Light Load due to Switching Loss = fsw x C x V x V: 1.Reduce C 2.Reduce V = ZVS 3.Reduce fsw => Green Mode

Jeffrey Hwang 10 min to design your power supply (V) 9 Full Load Condition Analysis Failure Rate Vs. Temperature

Jeffrey Hwang 10 min to design your power supply (V) 10 Full Load Condition Analysis It is desired to have a uniform Surface Temperature for Convection and Radiation By Proper Layout/Package/Enclosure

Jeffrey Hwang 10 min to design your power supply (V) 11 Full Load Condition Analysis Maximum Power Dissipation vs. Shape By Proper Layout/Package/Enclosure

Jeffrey Hwang 10 min to design your power supply (V) 12 Full Load Condition Analysis The Maximum Output Power vs. Shape h, Po By Proper Layout/Package/Enclosure

Jeffrey Hwang 10 min to design your power supply (V) 13 Full Load Condition Analysis Use the better Core Shape By Proper Layout/Package/Enclosure Due to the smooth surface, it has the better heat convection

Jeffrey Hwang 10 min to design your power supply (V) 14 Full Load Condition Analysis A Good AC Adapter Layout Keep the temperature uniform through out the board By Proper Layout/Package/Enclosure

Jeffrey Hwang 10 min to design your power supply (V) 15 Full Load Condition Analysis 36W Fly Back AC Adapter Experimental Result Design a Flyback Converter

Jeffrey Hwang 10 min to design your power supply (V) 16 Full Load Condition Analysis 36W Fly Back AC Adapter Experimental Result Design a Flyback Converter 90VAC with full load

Jeffrey Hwang 10 min to design your power supply (V) 17 Full Load Condition Analysis How To Improve Flyback Transformer Power Loss? 1.Reduce the n, Turn Ratio to reduce the Secondary Peak Current When n,Ip,Is, D, Lm, Ls, then Maximum Secondary Voltage. When n, Ip, Is, D is, Lm, Ls,then Maximum Secondary Voltage. 2. Increase the Flyback input voltage 3. Use the better RM core instead of EPC core Design Flyback Converter

Jeffrey Hwang 10 min to design your power supply (V) 18 Full Load Condition Analysis How To Improve Flyback Transformer Power Loss? Design Flyback Converter

Jeffrey Hwang 10 min to design your power supply (V) 19 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Increase the Flyback input Voltage Use SR, Synchronous Rectification + DCM Reduce the secondary current by reducing n, the turn ratio of Transformer (This will increase Mosfet Loss.) Design a Flyback Converter

Jeffrey Hwang 10 min to design your power supply (V) 20 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter Use a Synchronous Rectifier

Jeffrey Hwang 10 min to design your power supply (V) 21 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has the lower efficiency due to Trr, body diode recovery issue

Jeffrey Hwang 10 min to design your power supply (V) 22 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has Trr, body diode recovery issue

Jeffrey Hwang 10 min to design your power supply (V) 23 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has Trr, body diode recovery issue

Jeffrey Hwang 10 min to design your power supply (V) 24 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has Trr, body diode recovery issue DCM Efficiency vs. Input voltage 86%, 200V, Vin

Jeffrey Hwang 10 min to design your power supply (V) 25 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has Trr, body diode recovery issue Solution: Use DCM + SR, Synchronous Rectifier + Vin >200V + Reduce n

Jeffrey Hwang 10 min to design your power supply (V) 26 Full Load Condition Analysis How To Reduce Flyback Diode Rectifier Power Loss? Design a Flyback Converter CCM + Synchronous Rectification has Trr, body diode recovery issue Solution: Use DCM + SR, Synchronous Rectifier + Vin > 200V + Reduce n

Jeffrey Hwang 10 min to design your power supply (V) 27 Full Load Condition Analysis How To Improve Flyback MOSFET Power Loss? Increase the Flyback input voltage so conduction loss can be reduced due to D drops. Using DCM to prevent the Trr, diode reverse current issue Use a lower Rdson Mosfet Use ZVS Design Flyback Converter

Jeffrey Hwang 10 min to design your power supply (V) 28 Full Load Condition Analysis Conventional Flyback Converter: Design Flyback Converter LC tank’s C is due to S1 and It is very small, so Ring frequency (resonant frequency) is high.

Jeffrey Hwang 10 min to design your power supply (V) 29 Full Load Condition Analysis Conventional Flyback Converter: Design Flyback Converter Vds, S1 Ip The Energy Stored in leakage inductor is wasted in the ringing. resonant f is high so it is difficult to control (manufacture control) it.

Jeffrey Hwang 10 min to design your power supply (V) 30 Full Load Condition Analysis ZVS Flyback Converter: Active Clamp Design Flyback Converter LC tank’s C is due to Cclamp~1uF and It is relative big, so Ring frequency (resonant frequency) is lower.

Jeffrey Hwang 10 min to design your power supply (V) 31 Full Load Condition Analysis ZVS Flyback Converter: Active Clamp Design Flyback Converter No Ring and ZVS The energy is stored in the core; release to the input

Jeffrey Hwang 10 min to design your power supply (V) 32 Full Load Condition Analysis ZVS Flyback Converter: Active Clamp Design Flyback Converter No Ring and ZVS

Jeffrey Hwang 10 min to design your power supply (V) 33 Full Load Condition Analysis ZVS Flyback Converter: Active Clamp Design Flyback Converter 4.5% Improvement

Jeffrey Hwang 10 min to design your power supply (V) 34 Full Load Condition Analysis ZVS Flyback Converter: Active Clamp Design Flyback Converter 4.5% Improvement due to: Energy in leakage L and Snubber is saved (Clamped) Energy in Vds-parasitic capacitor is saved (ZVS) However, it is expensive: It needs a high side driver, an extra high side Mosfet and a simple control circuit Can we do it without additional cost?

Jeffrey Hwang 10 min to design your power supply (V) 35 Full Load Condition Analysis ZVS Flyback: Secondary Synchronous Rectifier with CM6201 (smart driver) Design Flyback Converter LC tank’s C becomes to Co/(n x n)~25uF to 50uF and It is big, so Ring frequency (resonant frequency) is very low.

Jeffrey Hwang 10 min to design your power supply (V) 36 Full Load Condition Analysis ZVS Flyback: Secondary Synchronous Rectifier with CM6201 (smart driver) Design Flyback Converter Benefits: It does not need high side driver and high side mosfet Synchronous Rectification at DCM Fly back full load Efficiency is increased from ~86% to~90% at Flyback input=200V

Jeffrey Hwang 10 min to design your power supply (V) 37 Full Load Condition Analysis Summary: designing Flyback full load & Vin=200V Design Flyback Converter Without additional cost: load Vin >= 200V ( with PFC-PWM combo CM6805/06/CM6903)…. Δη =3% n, turn ratio = 5 or 6….Reduce Is peak current Full load at DCM but approach to CCM….remove Trr ZVS by controlling LC variation….Δη=1.5% With additional cost: load Secondary Synchronous Rectifier +ZVS: (CM6201) # Total additional Δ$~ $0.3 at high volume…. Δη=2% RM core #Δ$ ~$0.2 at high volume….. Δη=1.5% ZVS Active Clamp at primary side….Δ$ ~$0.8 with Δη=2% Without the proper design, efficiency could be below 80%.

Jeffrey Hwang 10 min to design your power supply (V) 38 Full Load Condition Analysis Design a Follower Boost PFC Choose Follower Boost Inductor CM6805 family vs. CRM, 6561 L ↑, Efficiency ↑ For CRM, 6561, it cannot increase boost inductance. 1.L↑, frequency needs to go lower and it can go below 20Khz 2.Ton=L / Rload; for a given load, Ton is a constant 3.L ~ 471uH cannot go higher for the Po = 100W 4.Ipeak = Iin Peak x 2 (I x I x R is big; efficiency is poor!) 5.At high line and light load, frequency can go above 400Khz (EMI issue is severe.) For CM6805/CM6806/CM6903 fixed switching frequency=67.5Khz, 1.Lcm6805 family ~ Lcrm (67.5khz) x 5 (Optimal Inductance Value) 2.Lcrm ~ 90VAC 3.Loptimal = W to L= L ↑, Efficiency ↑ 5.Both the cost of Boost Mos and Boost Rectifier can be reduced Efficiency (CCM) – Efficiency (CRM) > 3% (total system )

Jeffrey Hwang 10 min to design your power supply (V) 39 Full Load Condition Analysis η=91.37%, Vin=90VAC, Po=1KW 2% MOSFET Boost Power Dissipation Breakdown Boost 400V Cap Design a Follower Boost PFC 1%

Jeffrey Hwang 10 min to design your power supply (V) 40 Full Load Condition Analysis η=91.37%, Vin=90VAC, Po=1KW Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 41 Full Load Condition Analysis Power Dissipation in Boost Diode Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 42 Full Load Condition Analysis Power Dissipation in Boost Mosfet Dominated One Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 43 Full Load Condition Analysis Design a Follower Boost PFC 4.5% Improvement

Jeffrey Hwang 10 min to design your power supply (V) 44 Full Load Condition Analysis PFC Boost with 380V only Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 45 Full Load Condition Analysis Continuous Boost Follower Added Circuit VlineDC needs to be closed to Dc and > = 5V. 4.5% Improvement….cost~$0.03 Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 46 Full Load Condition Analysis Two Level Boost Follower (Q1 on, low line and Q1 off high line) 4.0% Improvement….cost~$0.02 Added Circuit high line will turn off Q1 low line will turn on Q1. Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 47 Full Load Condition Analysis Two Level Boost Follower or Continuous Boost Follower 4.0% to 4.5% Efficiency Improvement….cost~$0.02 to $0.03 Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 48 Full Load Condition Analysis PFC Boost Rectifier Trr issue Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 49 Full Load Condition Analysis Use SiC to solve PFC Boost Rectifier Trr issue Δη~1% Δ$~$1.0 Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 50 Full Load Condition Analysis SiC will help if the frequency is high. Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 51 Full Load Condition Analysis Use Soft Switching to solve Trr issue Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 52 Full Load Condition Analysis Use Soft Switching to solve Trr issue Δη=2% Δ$~$1.3 Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 53 Full Load Condition Analysis Bridgeless PFC Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 54 Full Load Condition Analysis Bridgeless PFC Δη=1%......Δ$~$0.5 Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 55 Full Load Condition Analysis Efficiency Improved due to LETE Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 56 Full Load Condition Analysis Efficiency Improved due to LETE Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 57 Full Load Condition Analysis CM68XX Δ$ = -0.1 at no cost…Δη=1% with LETE Design a Follower Boost PFC

Jeffrey Hwang 10 min to design your power supply (V) 58 Full Load Condition Analysis Design a Follower Boost PFC Without Cost: load 2 level Boost Follower(200V/380V)….Δη~4% CM6805/CM6806/CM6903…. Δη~1% Summary: design a Boost full load and Vin=90Vac With Cost: load SiC…. Δ$~1.0 and Δη~1% Soft Switching…. Δ$~1.0 and Δη~1% Bridgeless PFC…. Δ$~1.0 and Δη~1%

Jeffrey Hwang 10 min to design your power supply (V) 59 Without Additional Cost (CM6805/CM6806/CM6903): load & Vin = 90VAC η pfc x η flyback = 96.5% x 87.5%= 84.4% Full Load Condition Analysis Design a Follower Boost PFC Summary: Design a Champion AC Full Load and Vin=90Vac With Δ$~$0.3 (CM6201): load & Vin = 90VAC η pfc x η flyback = 96.5% x 90%= 86.85% With Δ$~$3.3 : load & Vin = 90VAC η pfc x η flyback = 97.5% x 93%= 90.7%

Jeffrey Hwang 10 min to design your power supply (V) 60 Green Mode Build-in-Green-Mode CM6805/CM6806/CM6903 The Best Way to Save Energy is to “Turn Off” Your Appliance Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down

Jeffrey Hwang 10 min to design your power supply (V) 61 Green Mode Build-in-Green-Mode CM6805/CM6806/CM6903 User Defined GMth, Green-Mode Threshold Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down

Jeffrey Hwang 10 min to design your power supply (V) 62 CM6805/CM6806/CM6903 Build-In Green Mode Functions Build-in-Green-Mode CM6805/CM6806/CM6903 Reduce the switching frequency when the load is light Turn off GMth Bleed Resistor can be 2 Mohm or higher without influence the turn-on time Reduce operating current Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down

Jeffrey Hwang 10 min to design your power supply (V) 63 Green Mode Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903

Jeffrey Hwang 10 min to design your power supply (V) 64 The Timing Diagram of f RtCt = 2 x f PWM = 4 x f PFC in CM6805, CM6806 and CM6903 f RtCt fpwm CM6805 f PFC fpwm CM6806 Pulse Skipping from the controller Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903

Jeffrey Hwang 10 min to design your power supply (V) 65 PWM Green Mode Pulse Skipping Timing Diagram 70K Hz/ Light Load Efficiency ↑, Goes up, as fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903

Jeffrey Hwang 10 min to design your power supply (V) 66 Light Load Efficiency ↑, Goes up, as V↓& fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903 Turn Off PFC! When Load is below Green Mode Threshold, GMth

Jeffrey Hwang 10 min to design your power supply (V) 67 Light Load Efficiency ↑, Goes up, as V↓& fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903 Po=100W Design for V+I pin and PWMtrifault

Jeffrey Hwang 10 min to design your power supply (V) 68 Light Load Efficiency ↑, Goes up, as V↓& fpwm↓, Goes down Build-in-Green-Mode CM6805/CM6806/CM6903 Spread Sheet for the PWM Design for a FlyBack

Jeffrey Hwang 10 min to design your power supply (V) 69 Increase Start-Up Resistor above 2M ohm without Increasing Turn-On Time Build-in-Green-Mode CM6805/CM6806/CM6903 Light Load Efficiency ↑, Goes up, as Rac ↑,V↓& fpwm↓

Jeffrey Hwang 10 min to design your power supply (V) 70 Light Load Efficiency ↑, Goes up, as Rac ↑,V↓& fpwm↓ Build-in-Green-Mode CM6805/CM6806/CM6903

Jeffrey Hwang 10 min to design your power supply (V) 71 Light Load Efficiency ↑, Goes up, as Rac ↑,V↓& fpwm↓ Build-in-Green-Mode CM6805/CM6806/CM6903 RAC functions: Serve as a Start-Up Resistor Feed-forward input Sine wave for PFC 1.Leading-edge-modulation-PFC-current-loop slope compensation 2.Power Limit

Jeffrey Hwang 10 min to design your power supply (V) 72 Light Load Efficiency ↑, Goes up, as Rac ↑,V↓& fpwm↓ Build-in-Green-Mode CM6805/CM6806/CM6903 Improve Light Load CM6805/CM6806: Reduce PWM switching frequency by pulse skipping Turn Off Green-Mode Threshold, GMth Increase Start-Up resistor, RAC > 2M No Load, Pin<0.3W

Jeffrey Hwang 10 min to design your power supply (V) 73 CM6805, CM6806 and CM6903 PFC - FlyBack AC Adapter Controller CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 74 PFC Start Up then PWM Start Up CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 75 Soft Start for both PFC and Flyback PFC Soft Start with PWM Soft Start CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 76 Fast PFC Voltage Loop Speed up the PFC Voltage Loop by 3X CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 77 Fast PFC Voltage Loop Error Amplifier Transconductance Amp, GM vs. Operational Amp, OP CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 78 Fast PFC Voltage Loop Transconductance Amp, GM Operational Amp, OP Output Impedance, Z out ? Input Impedance Z in ? Z in ~ High Z out ~ High Z out ~ Low Transconductance Amp, GM vs. Operational Amp, OP CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 79 Fast PFC Voltage Loop 2 Main Purposes of the Error Amp 1.Force V + = V - and it means V fb = 2.5V 2.Compensation: It needs the R c and C c CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 80 Fast PFC Voltage Loop V FB OP Integrator The Miller Effect slows down the V fb node. Also, PFC Voltage Loop is very slow. The consequence: V fb becomes very slow. This local feedback is bad! CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 81 Fast PFC Voltage Loop For GM, there is no local feedback. There is only one outer loop and there is no inner loop. V fb is a much faster node. GM Integrator CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 82 Fast PFC Voltage Loop GM V (mho) 0 12u/div 2.5V 0V 3.0V I veao (uA) 12u/div 69.3u mho nA 0uA -60uA 60uA V FB V FB =2.51V CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 83 Easy to meet UL1950 CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 84 Leading Edge Modulation PFC Synchronize with Trailing Edge Modulation PWM Smaller 400V Bulk Capacitor with 1% better efficiency and 30% ripple reduction Simplest PFC control, Input Current Shaping Technique, ICST (Open Loop Current Mode) It works for both CCM or DCM Fixed Switching Frequency, fpfc = 67.5Khz for easy input EMI filter design Automatic Slope Compensation with IAC Rac at IAC pin serves as a Start-Up Resistor 3X PFC Voltage Loop PFC has a Tri-fault protections for UL1950 PFC Soft Start PFC OVP + VCC OVP PFC Current Limit Universal Input AC Brown Out Automatic Turn Green Mode Easy to configure into Boost Follower PFC Features CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 85 PWM Features Design for FlyBack Converter Constant Maximum Power Current Mode with inherent slope compensation Constant Switching Frequency, fpwm = 67.5Khz (CM6805 and CM6903), fpwm = 135Khz (CM6806) Exact 50% maximum duty cycle PWM has a PWMTri-fault protections for short and Green Mode PWMTrifault can be programmed to turn off Green Mode PWMTrifault can be programmed to detect the short or can be programmed to do thermal protection PWM has 10 mS digital soft start CM6805/CM6806 in 10 pin SOIC packages CM6903 in 9 pin SIP package CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 86 More Features ·Input Power, Pin<0.3 No Load ·23V BiCMOS (it can drive IGBT) ·ISTART ~ 100µA ·IOPERATING ~ 2mA without load ·Industry First CM6805/CM6806 PFC-PWM Combo in 10 pin SOIC packages ·Industry First PFC-PWM Combo CM6903 in 9 pin SIP package CM6805, CM6806 and CM6903 CM6805/CM6806/CM6903/CM6201

Jeffrey Hwang 10 min to design your power supply (V) 87 CM6903 Input Current Shaping Technique PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 88 CM  Input Current Shaping Technique PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 89 CM6903 Input Current Shaping Technique PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 90 How does it work? Input Current Shaping Technique PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 91 10pin SOIC PFC-PWM combo: CM6805/CM6806 Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 92 9pin SIP PFC-PWM combo: CM6903 Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 93 Typical CM6805/CM6806 & CM6903 application circuit Circuit configuration has been modified. 400V Rated Capacitors Can Be Used! Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 94 PWM SECTION CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 95 CM6805/CM6806/CM6903 PFC Controller: Leading Edge Modulation with Input Current Shaping Technique (ICST) Input Current Shaping Technique PFC with Leading Edge Modulation PFC Control

Jeffrey Hwang 10 min to design your power supply (V) 96 ICST is based on the following equations:    Equation 2 means: average boost inductor current equals to input current. Assume that input instantaneous power is about to equal to the output instantaneous power. For steady state and for the each phase angle, boost converter DC equation at continuous conduction mode is:  (3) Input Current Shaping Technique PFC with Leading Edge Modulation PFC Control CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 97 Rearrange above equations, (1), (2),(3), and (4) in term of Vout and d, boost converter duty cycle and we can get average boost diode current equation (5): Also, the average diode current can be expressed as:  (5) Input Current Shaping Technique PFC with Leading Edge Modulation PFC Control CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 98 If the value of the boost inductor is large enough, we can assume It means during each cycle or we can say during the sampling, the diode current is a constant. Therefore, equation (6) becomes: , I d is constant during each switching period, 1/67.5khz. Input Current Shaping Technique PFC with Leading Edge Modulation PFC Control CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 99 Using this simple equation (8), we implement the PFC control section of the PFC-PWM controller, CM6805, CM6806, CM6903 & CM6501 (8) Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation PFC Control CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 100 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation PFC Control Review Leading Edge Modulation & Average Current Mode PFC Control CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 101 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 102 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 103 Usually, the pole of Isense filter ~ 1/6 of the switching frequency, and it is 67.5khz/6 = 1/(2×π×R filter ×C filter ) If R filter =1K Ω, C filter =14.15nF. 2 purposes to add Isense filter: Protect IC during inrush current Using smaller inductor and still having good THD Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 104 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 105 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 106 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 107 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 108 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 109 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 110 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 111 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 112 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 113 PFC Section For CM6805/CM6806 & CM6903, Bleed Resistor Not Required Negative Charge Pump Not Required for the PFC section Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 114 IAC enhances the THD during light load and high line Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation D<50% needs Slope Compensation CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 115 CM6800 or CM6805 Family For CM6800 family, ΔV EAO =6V-0.625V=5.375V and For CM6805, CM6806 and CM6903, ΔV EAO =(6V V)/4=1.34V Input Current Shaping Technique PFC with Leading Edge Modulation Voltage Loop CM6805, CM6806 and CM6903

Jeffrey Hwang 10 min to design your power supply (V) 116 CM6805/CM6806 & CM6903 PWM Control: 1.5V Precision Current CMP + 10 ms Digital Soft Start Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation & Trailing Edge Modulation PWM

Jeffrey Hwang 10 min to design your power supply (V) 117 PWM Section Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation & Trailing Edge Modulation PWM

Jeffrey Hwang 10 min to design your power supply (V) 118 Input Current Shaping Technique (ICST) PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 119 Design High Density AC Adapter 8 Pin 12V Secondary Fly Back Smart Driver, CM6201

Jeffrey Hwang 10 min to design your power supply (V) 120 Design High Density AC Adapter 8 Pin 12V Secondary Fly Back Smart Driver, CM6201 Pin to pin compatible with STSR30 Supply voltage range: 7 to 13.2V Feed-Forward Peak Detect for wide input range CCM or DCM Fly-back operation Operating Frequency: up to 750 KHz Automatic turn off for duty cycle less than 12.5% Smart turn off (240nS) Output driver: 15 Ohms sourcing and 6 Ohms sinking capability

Jeffrey Hwang 10 min to design your power supply (V) hour Engineering Supports Champion Design Center – Design Excel Spread Sheets –PWM design for Flyback Converter Section –CM6805, CM6806, CM6903 Design Tool Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 122 PWM design for Flyback Converter Section Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 123 CM6805 CM6806 CM6903 Design Tool Input Current Shaping Technique PFC with Leading Edge Modulation

Jeffrey Hwang 10 min to design your power supply (V) 124 Summary High Density AC Adapter Design without additional cost –PFC: Efficiency~95.5% without additional cost 2 Level Boost Follower (200V and 380V) Use LETE, CM6805, CM6806 and CM6903 family –FlyBack: Efficiency~87.5% (without SR) –FlyBack: Efficiency~90% (with SR, CM6201) –Total Efficiency ~ from 83.56% to 86% Input Current Shaping Technique PFC with Leading Edge Modulation