600 W half-bridge LLC evaluation board

Transcription

1 600 W half-bridge LLC evaluation board EVAL_600W_1V_LLC_CFD7 Di Domenico Francesco (IFAT PMM ACDC AE) Zechner Florian (IFAT PMM ACDC AE)

2 Table of contents 1 General description Efficiency results 3 Design concept

3 Table of contents 1 General description Efficiency results 3 Design concept 3

4 General description The EVAL_600W_LLC_1V_CFD7 - evaluation board shows how to design a half-bridge LLC stage of a server SMPS with the target to meet 80+ Titanium Standard efficiency requirements. For this purpose the following components have been used: latest 600 V CoolMOS CFD7 SJ MOSFET technology (IPP60R170CFD7) on the primary side and OptiMOS 40 V low voltage power MOSFET (BSC010N04LS) in the synchronous rectification secondary stage, in combination with quasi-resonant CoolSET (ICEQR80Z), EiceDRIVER Compact EDL hi-low side driver (EDL05N06PF), EDN EiceDRIVER low side gate Driver (EDN754F) and analog LLC controller (ICEHS01G). Summary of features: Output voltage: 1 V Output current: 50 A Peak 50% load >97.4% 10% load >94% The following variants are available: 600 W 1 V LLC analog version with CoolMOS CFD7, EVAL_600W_1V_LLC_CDF7 Control card kit from analog to digital can be ordered additionally KIT_600W_LLC_DI_CTRL Additional analog control card KIT_600W_LLC_AN_CTRL 4

5 Example of system understanding: Infineon demo solution for Titanium HV DC-DC stage Half-bridge LLC with synchronous rectification in center tap configuration V in V DC Primary HV MOSFETs CoolMOS TM IPP60R170CFD7 Reduced gate charge (Q g ) Reduced E off High body diode ruggedness SR MOSFETs OptiMOS TM BSC010N04LS New generation Best FOM R DS(on) x Q g Best FOM R DS(on) x Q oss V in_nom V out_nom I out 380 V DC 1 V DC 50 A HB gate driver IC EDL05N06PF Non isolated LS gate drive EDN754F LLC controller Analog ICEHS01G Bias QR flyback controller ICEQR80Z SR MOSFETs BSC010N04LS P o 600 W f res =f khz f min 90 khz f max 10 khz Transformer turns ratio 16:1 C r 66 nf L r L m 15.5 uh 195 uh Resonant inductor RM1 core Transformer PQ35/35 core 5

6 Control card boards Infineon s 600 W LLC evaluation board delivered with analog control, digital control card kit online available Analog With ICEHS01G Resonant mode controller for half-bridge LLC resonant converter with synchronous rectification drives Driving signal for synchronous rectification which support full operation of half-bridge LLC resonant converter 0-pin DSO package 30 khz to 1 MHz switching frequency 50% duty cycle for both primary and secondary gate drives Adjustable dead time with high accuracy Order code: KIT_600W_LLC_AN_CTRL Digital (on request) With XMC400-Q48K56 AB ARM Cortex -M4, 80 MHz, incl. single cycle DSP MAC and floating point unit (FPU) 8-channel DMA + dedicated DMA for USB USB.0 full-speed device CPU Frequency: 80 MHz eflash: 56 kb including hardware ECC 40 kb SRAM Package: PG-LQFP-48 Order code: KIT_600W_LLC_DI_CTRL 6

7 PCB boards layout: main power board and control and bias daughter boards Power density>0 W/inch 3 Controller board Bias board 7

8 Main power board schematic CoolMOS CFD7 CoolMOS CFD7 8

9 Bias board schematic 9

10 Analog control board schematic 10

11 Table of contents 1 General description Efficiency results 3 Design concept 11

12 Automated efficiency measurement Combination of converter design (resonant tank, transformer) and proper HV device election Proper selection of SR LV device and secondary side design Output voltage: 1 V DC Output current: 50 A 0.1% total accuracy 1

13 Table of contents 1 General Description Efficiency Results 3 Design Concept 13

14 Design procedure: Input data n V in V _ nom out_ nom M M min max K K min max ( Q, m, F x ) ( Q, m, F x ) n V V o _ min in _ max n V V o _ max in _ min 14

15 Resonant tank components and related resonant frequencies n=v in_nom /(xv o )=380/(*1) 16 L m =195 µh L r =15.5 µh L n =L m /L r =1.5 C r =66 nf 1 fo 157kHz LrCr 1 fp 4. 7kHz ( Lr Lm) Cr 15

16 gain Gain curves DC - gain curve (600 W LLC hardware revision CFD7) 1, 1,1 M max n V V o _ max in _ min 1 5 A 15 A 0,9 0,8 M min n V V o _ min in _ max 5 A 35 A 50 A 0,7 0,6 frequency [Hz] 16

17 Energy related calculations (Ref. IPP60R170CFD7 device parameters) I m ag _ min n V fsw _ o max L m 0.67 A En En res _ min cap _ max 1 1 ( L m Lr) I² (Co( er)) V ² mag _ min DS _ max 95.1 J 9 J En res _ min En cap _ max 17

18 Q oss, I mag,pk, t dead,min, t ecs relationship I m,pk I Q I Q IQ ( t) Im, ( t) 0 pk (1 t t ecs ) t tecs t tecs t ecs f ( Rg, tot, Vgs, th C, C ds gd ) I m,pk I CHB t dead,min 0 I C HB 1 ( t) dt Im, pk tecs Im, pk ( tdead, min tecs) 400 V V BULK V HB 1 t dead, min t m, pk t ecs t dead,min ecs Q I 400 V 18

19 Time related calculations (Ref. IPP60R170CFD7 device parameters) I I t t m ag _ min m ag _ max dead dead n V fsw _ n V fsw _ o min L m 1.66 tecs 400V, min 130 nsec Im ag, max tecs 400V, max 311nsec Im ag, min o max L m 0.67 A A 19

20 Main transformer structure: PQ35/35 core with TDK PC95 ferrite material 0

21 Resonant choke: RM1 core, material N87 1

22 Evaluation board EVAL_600W_1V_LLC_CFD7

23 Support Technical Material Application Notes Simulation Models Datasheets PCB Design Data EVAL_600W_1V_LLC_CFD7 Evaluation Boards Evaluation Boards Demoboards Reference Designs Videos Technical Videos Product Information Videos 3

24 Support Online tools and services Subscribe to Newsletter Where to Buy 3 Tools, Finders and Selectors 4 Support 4 4

25