超薄电源适配器设计方案

1、 Current Power Adapter status and challengesEnergy Star v2.0 specification for PC external power ST Proposal for the Slim Adapter(90W+ Proposal (i base on L6563+L6591AHBProposal (ii base on L6563+L6599ALLC AHBL6591, LLCL6599A features comparison Conclusions ST Power contact window (GC Q&A Propos

2、al (i (A.H/BPFC : L6563PWM: L6591 A.H/BSyn-Rectification: IC(STSR2 or non-ICs driverProposal (ii (LLC Resonant H/BPFC: L6563PWM: L6599ASyn-Rectification: IC driver Available now ! L6591: AHB ZVS PWM Primary Controller POWER DENSITY SW SO SW SO II FF TH T TH T CI CI NG NG HALF BRIDGE TOPOLOGY ZERO VO

3、LTAGE SWITCHING NO SWITCHING LOSSES TURN ON UP TO 500KHz OPER. FREQ. SMALL MAGNETICS AND CAP, SHORT RESPONSE TIMES, SMALL FILTERS, LOW NOISE LEVELS ON-BOARD HV START-UP GEN. LOW QUIESCENT CURRENT (<3mA BURST MODE LIGHT LOAD INTERFACE PIN WITH PFC PULSE-BY-PULSE OCP TRANSFORMER SAT. DETECTION LATC

4、HED OR AUTORESTART OVP BROWNOUT PROTECTION ADAPTIVE UVLO LOW POWER CONSUMPTION PROTECTIONS 10 L6591: HB ZVS PWM Primary Controller Typical Applications: LINE DIS ISEN SS OSC VREF COMP PFC_STOP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 HVSTART BOOT HVG FGND N.C. GND LVG Vcc High Power AC-DC Adapters >

5、; 90W ATX Desktop PCs (85+ initiative Servers (90+ initiative Telecom SMPS Audio Systems 11 Asymmetrical Half Bridge Waveforms Q1 current 0 Hysteresis loop ASIMMETRIC HB midpoint voltage Vin Iload D1 current 0 0 Lout current Iload 0 L6591 Tank circuit current Iload 0 0 D2 current 12 AHB 2nd side Wav

6、eforms Vrect Vin·(1-D/n1 Vin·D/n2 Vrect D1 Iout ILout Iout ID1 = ISEC1 D2 ID2 = ISEC2 Rectifiers reverse voltages 1 1 VD1 = Vin D + n n 2 1 1 1 VD 2 = Vin (1 D + n n 2 1 13 AHB Topology Key Features CONTROL PWM fixed frequency (Dmax = 50% Dead time between HG and LG to allow ZVS HALF BRIDG

7、E ZVS operation: Soft Switching - No switching losses turnon SECONDARY SIDE Balanced or unbalanced (Ns1Ns2 transformer Output inductor needed Can be coupled for multiple outputs TRANSFORMER Unbalanced transformer: no need of high Llk to obtain ZVS 14 L6591 Promotional Tools SAMPLES: AVAILABLE NOW (P

8、RODUCTION PHASE DATASHEETs: AVAILABLE ON ST WEB SITE DEMO BOARDS: EVL6591-90WADP (AVAILABLE AN2842 12V/90W AC-DC Adapter with PFC using L6563 + L6591 Energy Star 2.0 compliant EVL6591-250WATX (IN PROGRESS PRELIMINARY DATA AND DEMO AVAILABLE UPON REQUEST 12V, 5V and 3.3V outputs 250W ATX, based on L6

9、591 ZVS AHB and L6563 PFC 85+ Compliant 15 90w_12v demoL6563+L6591, schematic AHB STAGE Options: Synchronous Rectifications PFC STAGE 16 90w_12v demoL6563+L6591, Data (Schottky Table 1. Efficiency115Vrms Load( % 25% 50% 75% 100% Iout (A Vout (V 1.8787 3.7537 5.6287 7.5037 12.09 12.08 12.07 12.06 Pou

10、t (W 22.71 45.34 67.94 90.49 Pin (W 26.83 51.41 76.67 102.48 Eff (% 84.66% 88.20% 88.61% 88.30% 87.44% Average Eff for EPA Table 2. Efficiency230Vrms Load( % 25% Table 3. No Load Power Consumption (W 90Vac 0.215 115Vac 0.225 135Vac 0.235 180Vac 0.255 230Vac 0.290 264Vac 0.315 50% 75% 100% Iout (A Vo

11、ut (V 1.8787 3.7537 5.6287 7.5037 12.09 12.08 12.07 12.06 Pout (W 22.71 45.34 67.94 90.49 Pin (W 27.02 51.05 75.60 100.55 Eff (% 84.06% 88.82% 89.87% 90.00% 88.19% Average Eff for EPA 17 90w_12v demoL6563+L6591, Data (Syn-Rect Syn- Recti IC or Non-ICs inccease in rrease d d +2 % effi +2 % effi Table

12、 1. Efficiency115Vrms Load( % 25% 50% 75% 100% Iout (A Vout (V 1.8787 3.7537 5.6287 7.5037 12.09 12.08 12.07 12.06 Pout (W 22.71 45.34 67.94 90.49 Pin (W 26.34 50.22 74.89 100.26 Eff (% 86.21% 90.28% 90.97% 90.25% 89.43% Table 2. Efficiency230Vrms Load( % 25% 50% 75% 100% Iout (A Vout (V 1.8787 3.75

13、37 5.6287 7.5037 12.09 12.08 12.07 12.06 Pout (W 22.71 45.34 67.94 90.49 Pin (W 26.55 49.86 73,82 98.33 Eff (% 85.53% 90.93% 92.03% 92.02% 90.13% 18 Average Eff for EPA Average Eff for EPA High-power Adapter (90W+ System Architecture (ii LLC/L6599A PFC PRE-REGULATOR (BOOST DC-DC CONVERTER (LLC RESON

14、ANT HALF-BRIDGE HG Vinac EMI Filter LG CV/CC CTL Voutdc PWM is turned off in case of PFC's anomalous operation, for safety Option: synchronous rectification PFC L6563 RESONANT L6599A PFC can be turned off at light load to ease compliance with energy saving requirements. Syn-Re cti driver I C Ava

15、ilab s le ! 19 L6599A: HV Resonant Controller HALF BRIDGE TOPOLOGY ZERO CURRENT & ZERO VOLTAGE SWITCHING POWER DENSITY SOF SWI SOFT SWI H T T C THC N II G NG LOSSLESS I/O TRANSFER OF ENERGY - REDUCED CONDUCTION AND RADIATED NOISE UP TO 500KHz OPER. FREQ. SMALL MAGNETICS AND CAP, SHORT RESPONSE T

16、IMES, SMALL FILTERS, LOW NOISE LEVELS LOW QUIESCENT CURRENT (<2mA BURST MODE LIGHT LOAD INTERFACE PIN WITH PFC LOW POWER CONSUMPTION TWO-LEVEL OCP: FREQ. SHIFT and LATCHED SHUTDOWN BROWNOUT PROTECTION SAFETY LATCHED DISABLE INPUT 20 Typical Resonant LLC Architecture Td between LG and HG To allow

17、ZVS Operation Turn-on No Output Choke fsw fr sinusoidal waveforms low turn-off losses low EMI Out Auxiliary Stage: VIPer15/16/17 for std-by up to 5W Extremely low consumption VIPer25/27/28 for std-by from 5W to 10W L6566A/B with external Mosfet for higher power levels ZCS Operation No recovery losse

18、s 21 Typical Resonant LLC Architecture with Synchronous Rectification STD MOSFETs! (not logic Supporting also Housekeeping function on secondary side with TSM104 Higher Efficiency Improved Form Factor 22 L6599A vs. L6599 In L6599A, both DIP-16 and SO16N are from now on always Halogen-Free A thermal

19、extended (-40 to 125 deg version can be derived. It is named L6599AT (L6599ATD, L6599ATDTR, L6599ATN Improved spread of electrical parameters (see other doc. Improved PFC_STOP function when used with L6563x. It possible to connect PFC stop pin (L6599A directly with RUN pin (L6563x 23 L6599A: Promoti

20、onal tools DATA SHEET: AVAILABLE ON THE WEB APPLICATION NOTES: LLC RESONANT HALF-BRIDGE CONVERTER DESIGN GUIDELINE (AN2450 19V-90W ADAPTER BOARD WITH PFC USING L6599 AND L6563 (AN2321 400W L6599-BASED HB LLC RESONANT CONVERTER FOR PDP (AN2492 400W L6599-BASED HB LLC RESONANT CONVERTER (AN2509 200W L

21、6599-BASED HB LLC RESONANT CONVERTER FOR LCD TV & FLAT PANELS (AN2393 DEMO BOARDS: 19V-90W BOARD WITH PFC USING L6599 AND L6563 (EVAL6599-90W 200W SMPS FOR LCD TV, USING L6599, L6563 and VIPer12A (EVAL6599-200W 400W SMPS FOR PDP USING L6599, L6563 and VIPer12A (EVAL6599-400W-S 400W GENERIC SMPS

22、USING L6599, L6563 and VIPer12A (EVAL6599-400W-T 350W 80+ DESKTOP SMPS (IN DESIGN DESIGN SOFTWARE: L6599 RESONANT CONVERTER DESIGN WORKBOOK (EXCEL SPREADSHEET, AVAILABLE ON REQUEST 24 Main Features:Synchronous rectification for LLC resonant topology allows to have an highest efficiency & power d

23、ensityAll synchronization signals from secondary side: simple design implementationCapability to work in CCM and DCM and manage all current/voltage waveforms typical of LLC topologyLight load detection and automatic sleep mode enter/exit: betterstandby and efficiencyVery low component count8 pins pa

24、ckage, SO8Current drive capability for rectification Mosfet(standard and logic level in power supply up to 12V/50A The typical application are SMPSAdapter from 90 W (Space shrunk/slim form factor PC (ATX (high efficiency/ smaller heat sink Sever (high efficiency Console games (high efficiency LCDTV

25、(space shrunk/slim form factor SRK2000: Efficiency results Efficiency with synchronous rectifiers: 2 X STP270N4F3 (2.5 mOhm (one for each center tap winding + 390 Vdc input voltage: Vout = 11.98V Pout = 230.37W Iout = 19.23A Pin = 242.50W Vout = 11.99V Pout = 119.90W Iout = 10.00A Pin = 127.10W (two

26、 for each center tap winding ncceas i n r r ea ed sed +2.5% +2.5%effi effi in eff% = 95.00% eff% = 94.33% Efficiency with schottky diodes: 4 X STPS20L40CFP 390 Vdc input voltage: Vout = 11.98V Pout = 230.37W Iout = 19.23A Pin = 249.70W Vout = 11.99V Pout = 119.90W Iout = 10.00A Pin = 130.45W eff% =

27、92.26% eff% = 91.91% 30 AHB, LLC Features Comparison Features A.H/BL6591 LLC Res. H/BL6599A able to reach 9596% thanks to Q1/Q2 easier to realize ZVS, D=50% (Max Variable freq, voltage mode, Dynamic = poor Efficiency able to reach 9495% thanks to the ZVS on (DC/DC block main Sw Q1 and reset Sw Q2, D

28、<=50% Dynamic side syncrectification Output Ripple Volt Burst Mode EMI Transformer usage factor Protection 2nd Fixed Freq, pulse by pulse current mode, dynamic = perfect A bit difficult to do syn- rectification due Easily to do Synchronous rectification thanks to variable freq, however ST dedicat

29、ed to fixed freq operation IC driver is simple design implemented with very low component count If for Dual output (CCM Ripple < 1% Vo Available on L6591, Stand by performance is Perfect Good 80% Thermal: Perfect Pulse by Pulse Good. If for Dual output (DCM Ripple < 3% Vo Available on L6599A, Stand by performance is Perfect Perfect 100% Thermal: Poor Voltage mode Poor. 31 Conclusion: Both L6563+L6591AHB and L6563+L6599ALLC which we proposed two platforms