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Low Standby Power AC Adapter L6562 + L6668 90W 19V/4.7A AC-DC Converter Reference Design.

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Presentation on theme: "Low Standby Power AC Adapter L6562 + L6668 90W 19V/4.7A AC-DC Converter Reference Design."— Presentation transcript:

1 Low Standby Power AC Adapter L6562 + L6668 90W 19V/4.7A AC-DC Converter Reference Design

2 90W Adaptor General Features Input Voltage range: 100 to 240Vac Output Voltage and current: 19V/4.7A Power Factor Correction: Above 0.98 Low Standby < 0.4W at no load condition High Efficiency, typical 82% at low line full load Latched OVP

3 L6562 - Power Factor Correction Transition Mode Control Very Precise Adjustable Output Over Voltage Protection Ultra-Low Startup Current (<70  A) ON-CHIP Filter ON Current Sense Disable Function 1% internal reference voltage -600mA/+800mA Totem Pole Gate Driver

4 L6668 - PWM Controller Current Mode Controller with sophisticated standby feature On board high voltage startup Low quiescent current (<2mA) Slope Compensation Pulse-by-pulse & Hiccup-Mode OCP Interface with PFC Controller Disable Function (on/off control) Latched Disable for OVP/OTP Function Programmable soft start

5 L6668 – Standby Operation The device operates in different modes depending on the converter’s load condition 1.) Fixed Frequency at heavy load 2.) Frequency-foldback at medium load 3.) Burst Mode Control with no or very light load.

6 This MOSFET has to withstand high stress for short period. L6668 + L6562 Operation Points to note: PWM is powered up before PFC. PFC is switched off during standby mode. PWM MOSFET has to withstand high stress for a short period of time under low line, full load before bulk capacitor voltage build up!

7 L6668 -- Programmable Frequency Foldback

8 L6668 -- Load Dependent Operating Mode

9 L6668 -- Interface with PFC Controller

10 L6668 -- Converter Output in Short Circuit

11 90W Demoboard Schematic

12 Demoboard Layout

13 PFC Inductor Inductance 0.7mH

14 Main Transformer Inductance 0.7mH

15 Demoboard Test Result – Power Factor

16 Demoboard Test Result – Standby power loss No Load Power (mW) Input Voltage (Vac)

17 Demoboard Test Result – Load Regulation 220Vac 100Vac Output Voltage Output Current

18 Demoboard Test Result -- Line Regulation 0A output current 5A output current Output Voltage Input AC Voltage

19 PFC Waveforms At 110Vac Ch.1 Current Waveform Ch2.: Bridge Rectifier output waveform At 220Vac Ch.1 Current Waveform Ch2.: Bridge Rectifier output waveform

20 Main Converter Vdrain Normal Operating Waveform At 110Vac At 220Vac

21 Main Converter Vdrain during Short Circuit Condition At 110Vac At 220Vac

22 Demoboard BOM Item ReferencePartDescription 1 Assembly Dwg. 2 Schematic 3 PC BoardPC Board,1-Layers,136mm x62mm 4 F1013.15A/250Vfuse 5 RTNTPA78R0LBMB0Murata NTR 6 RVG471varistor 7 R101,R1021.5Mresistor 8 R10322Kresistor 9 R10475Kresistor 10 R10520ohmresistor 11 R106,R107750Kresistor 12 R108,R1219.1Kresistor 13 R109470ohmresistor 14 R11168K3W resistor 15 R1120ohmresistor 16 R113,R1231Kresistor 17 R1144Kresistor

23 Demoboard BOM 18 R1152.2Kresistor 19 R116150Kresistor 20 R117,R12047Kresistor 21 R1186.2Kresistor 22 R11982.5Kresistor 23 R12210ohmresistor 24 R124,R125,R1262Mresistor 25 R12712Kresistor 26 R1285.6Kresistor 27 R20130ohm3W resistor 28 R2020ohmresistor 29 R2032.4Kresistor 30 R20415Kresistor 31 R205,R206,R2071Kresistor 32 R2085.6Kresistor 33 CX1010.22uF/275VX2 capacitor 34 CY2.2nF/400VMurata DE1E3KX222M 35 C1010.47uF/400V Capacitor

24 Demoboard BOM 36 C102,C109,C11310nF/50V Capacitor 37 C103680nF/50V Capacitor 38 C104,C1161uF/50V Capacitor 39 C105,C110,C111100nF/50V Capacitor 40 C1123.3nF/50V Capacitor 41 C10782uF/450V 电解电容 42 C108100uF/35V 电解电容 43 C11556nF/50V Capacitor 44 C11722uF/35V 电解电容 45 C2011nF/1KV Capacitor 46 C202,C203,C2041000uF/35V 电解电容 47 C205220uF/35V 电解电容 48 C206330nF/50V Capacitor 49 BR101KBL810Gbridge rectifier 50 D101STTH310Srectifier 51 D102P6KE250rectifier 52 D104FR107rectifier 53 D201,D202STPS20150CTrectifier

25 Demoboard BOM 54 Z10120Vzener diode 55 Z10213Vzener diode 56 Q101STP12NM50MOSFET 57 Q102STP10NK70ZMOSFET 58 Q1033904transistor 59 Q1043906transistor 60 Q201ST TL431voltage reference 61 COM101 400uH 共模 62 COM102 22mH 共模 63 COM201 360uH 共模 64 L101 22uH 差模色环电感 65 L201 10uH 差模磁棒 66 OPTK817P6opto-coupler 67 IC101L6562DPFC IC 68 IC102L6668PWM IC 69 TR1PQ32/20Transformer 70 TR2PQ32/20Transformer

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