Infineon 8KW HFHD PSU Manual
  1. Manuals
  2. Brands
  3. Infineon Manuals
  4. Computer Hardware
  5. 8KW HFHD PSU
  6. Manual
Infineon 8KW HFHD PSU Manual

Infineon 8KW HFHD PSU Manual

8 kw high power density and high frequency psu for ai data centers and servers
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
AN101816
8 kW high power density and high frequency
PSU for AI data centers and servers
REF_8KW_HFHD_PSU

About this document

Scope and purpose
This document introduces a new, complete power supply unit (PSU) for AI data centers and servers.
REF_8KW_HFHD_PSU can deliver 8 kW steady state maximum output power in the specified 180 V – 277 V AC
input AC voltage range, with a peak efficiency of 97.5% and a minimum efficiency of 96.5% from 30% to
100% of output power at 230 V
input voltage, including fan power consumption.
AC
With a size of just 40 mm x 73.5 mm x 450 mm (including chassis) and 100 W/in
power density,
3
REF_8KW_HFHD_PSU shows a viable approach for achieving higher power density and efficiency
simultaneously, in the AC/DC power conversion stage compared to current state-of-the-art solutions.
For easy implementation, REF_8KW_HFHD_PSU uses a traditional two-stage power conversion approach. The
front-end interleaved totem-pole AC/DC converter provides power factor correction (PFC) and regulates the
intermediate bulk, and the back-end isolated DC/DC LLC converter provides isolated and regulated 50 V
DC
nominal output voltage from the high-voltage rail.
Furthermore, the critical hold-up time requirement is addressed by the REF_8KW_HFHD_PSU power supply in
the proposed form factor, with no need of additional external circuits. The PSU is capable of 20 ms maximum
hold-up time at 100% output load by means of an auxiliary boost converter (namely hold-up time extension
circuit, or baby-boost).
Intended audience
The document is intended for R&D engineers, hardware designers, and developers of power electronic systems.
Figure 1
Overview of the REF_8KW_HFHD_PSU power supply unit
Application note
Please read the sections "Important notice" and "Warnings" at the end of this document
V 1.0
www.infineon.com
2025-03-20

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 8KW HFHD PSU and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Infineon 8KW HFHD PSU

Summary of Contents for Infineon 8KW HFHD PSU

  • Page 1: About This Document

    The document is intended for R&D engineers, hardware designers, and developers of power electronic systems. Figure 1 Overview of the REF_8KW_HFHD_PSU power supply unit Application note Please read the sections “Important notice” and “Warnings” at the end of this document V 1.0 www.infineon.com 2025-03-20...
  • Page 2 REF_8KW_HFHD_PSU About this document Figure 2 REF_8KW_HFHD_PSU measured efficiency including fan power consumption The key components from Infineon enabling REF_8KW_HFHD_PSU are: CoolSiC™ 650 V Gen 2, 40 mΩ TOLL (IMT65R040M2H), and EiceDRIVER™ 2EDB9259Y • for the fast switching boosting legs of the totem-pole PFC converter CoolSiC™...

  • Page 3: Table Of Contents

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Table of contents Table of contents About this document ........................1 Table of contents ..........................3 Safety information ......................... 5 Important notice ..........................5 Safety precautions ..........................
  • Page 4 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Table of contents EMI measurements ..........................52 Summary ..........................56 List of figures ........................57 Bill of materials ........................59 Schematics ........................... 65 References ............................ 71 Acronyms/abbreviations ........................

  • Page 5: Safety Information

    Please note that evaluation boards, demonstration boards, reference boards and kits are provided “as is” (i.e., without warranty of any kind). Infineon is not responsible for any damage resulting from the use of its evaluation boards, demonstration boards, reference boards or kits. To make our boards as versatile as possible, and to give you (the user) opportunity for the greatest degree of customization, the virtual design data may contain different component values than those specified in the bill of materials (BOM).

  • Page 6: Safety Precautions

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Safety precautions Safety precautions Note: Please note the following warnings regarding the hazards associated with development systems. Table 1 Safety precautions Warning: The evaluation or reference board contains DC bus capacitors, which take time to discharge after removal of the main supply.

  • Page 7: Background And Specifications

    (VRM) stages to be capable to provide high power to the data processing hardware (e.g. GPUs, etc.) in a small form factor compared to past requirements. The REF_8KW_HFHD_PSU reference design from Infineon demonstrates a viable approach for achieving higher power density and efficiency simultaneously in the AC/DC power conversion stage compared to current state-of-the-art solutions.
  • Page 8 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Background and specifications Figure 3 Dimensions of the 8 kW power supply REF_8KW_HFHD_PSU compared to OCP v3 requirement for the 5.5 kW PSU Application note V 1.0 2025-03-20...

  • Page 9: Electrical Performance Of The 8 Kw Psu

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Background and specifications Electrical performance of the 8 kW PSU Steady state performance of the 8 kW PSU Table 1 Values Parameter Symbol Unit Note or test condition Min.
  • Page 10 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Background and specifications Values Parameter Symbol Unit Note or test condition Min. Typ. Max. PFC operating – – High-frequency bridge SW,PFC frequency Nominal bulk voltage –...
  • Page 11 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Background and specifications Values Parameter Symbol Unit Note or Test Condition Min. Typ. Max. Triggers PSU shutdown Output voltage UVP – – out,UVP latching protection LLC primary Triggers PSU shutdown –...

  • Page 12: System Overview And Description

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description System overview and description System overview The REF_8KW_HFHD_PSU reference design is shown in Figure 4 with its chassis. The overall dimensions including the steel chassis are 40 mm x 73.5 mm x 450 mm.
  • Page 13 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description The first AC/DC conversion stage is a two-stage interleaved totem-pole PFC converter. Besides rectifying the • AC input to 405 V , this stage also provides power factor correction (PFC), and current total harmonic distortion (iTHD) regulation The second DC/DC conversion stage is a full-bridge primary, full-bridge secondary resonant LLC DC/DC...

  • Page 14: Power Stage Control And Protections

    (latching). Highlighted products Infineon power semiconductors and ICs are key in enabling 8 kW output power in the 100 W/in form factor. For the interleaved AC/DC bridgeless totem-pole PFC, a full SiC solution with paralleled MOSFETs has been...
  • Page 15 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description For the hold-up, in-rush and re-rush control circuit between the PFC and the LLC stages: Hold-up time extension circuit • 2x CoolMOS™...

  • Page 16: Hardware Implementation

    Figure 7 Hardware implementation of REF_8KW_HFHD_PSU (bottom side) Overall, the 8 kW Infineon power supply is comprised of the following boards: The main board (M100001428) acting as a support for the whole PSU; it hosts the power daughter cards and •...

  • Page 17: Pfc And Llc Power Daughter Cards

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description 2.5.1 PFC and LLC power daughter cards Figure 8 Figure 9 show respectively the PFC and LLC daughter cards as discussed in Section 2.5. The LLC daughter card (PW100001427) hosts the primary full-bridge of the LLC DC/DC converter, together with the two isolated supplies for the two high-side switches.

  • Page 18: Llc Transformer Implementation Overview

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description 2.5.2 LLC transformer implementation overview The LLC secondary side is embedded within two transformers having a planar structure, together with the LLC series resonant inductor and the parallel resonant inductor.

  • Page 19: Psu Efficiency And Losses

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU System overview and description PSU efficiency and losses The measured efficiency and the losses of the totem-pole PFC are shown in Figure 11 at different AC line voltages: 277 V , 230 V , and 180 V...

  • Page 20: Topology Blocks Description

    Figure 5 can be verified independently on Infineon’s open-frame evaluation boards EVAL_3K3W_TP_PFC_SIC and EVAL_3K3W_LLC_HB_CFD7, available to order on the Infineon website or via distributors. Equivalent performance of the baby-boost circuit can also be evaluated on REF_3K3W_HFHD_PSU. Note: In REF_8KW_HFHD_PSU, all the power circuits share power earth (PE) via the metallic chassis. For electrical safety and cooling reasons, it is recommended not to operate the board without chassis.
  • Page 21 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 14 PFC efficiency and power losses standalone at 230 V AC input voltage Figure 15 illustrates the distribution of losses among the PFC components at 230 V input AC voltage. The bar plot shows that the majority of the losses are related to conduction losses in the EMI filter and the PFC inductors, as well as bulk capacitor losses.

  • Page 22: Emi Filter Magnetics

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description 3.1.2 EMI filter magnetics The input EMI filter is a dual stage filter, where the two common mode inductors also integrate the differential mode inductance.
  • Page 23 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 18 EMI common mode inductor details (a) and pinout (b) Figure 19 3D explosion drawing of the EMI filter inductor and a winding example Application note V 1.0 2025-03-20...

  • Page 24: Pfc Magnetics

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description 3.1.3 PFC magnetics The PFC inductor choke design is based on a toroidal high-performance magnetic powder core. Toroidal chokes have a large surface area which allows homogeneous heat distribution without hot spots and allows good confinement of the magnetic field.

  • Page 25: Control Scheme Of The Pfc

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 22 Core high frequency flux (a), and total flux including AC line component (b) over a single AC line cycle at 230 V AC Figure 23 PFC inductor effective inductance vs DC bias and bulk capacitance ripple over a single AC line cycle at 230 V AC...

  • Page 26: Sensing In The Pfc Converter

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description The overall control loop scheme includes feed-forward of the duty cycle (known the AC input and the bulk voltages) at the output of the current loop compensator, and a feed-forward of the LLC output load. The LLC load information is transferred from the LLC controller to the PFC XMC4200 controller via the UART interface.

  • Page 27: Driving Coolsic™ And Coolmos™ Switches

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 25 Sensing circuitry of the totem-pole PFC converter with XMC™ For the two boost currents, two hall-effect sensors have been used since they are a good fit for phase current sensing in the PFC stage.
  • Page 28 Figure 27 Driving CoolSiC™ in the rectification bridge Infineon Technologies Austria AG assumes no liability for re-use, application, customer product design or infringement of patents related to the present material. FID1 and is not considered by Infineon Technologies Austria AG to be part of a finished end product for general consumer uses.
  • Page 29 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description PRI_12V PRI_HS_19.5V IC11 PRI_24V PRI_LS_19.5V VOUT_1 4.7uF Out_SRC 4.7uF ES1JAL_M3G 4.7uF 600V Out_SNK 4.7uF VOUT_2 150uF 4.7uF 4.7uF 4.7uF LM317EMP/NOPB 1EDN8511B IC10 SGND Voltage doubler 12V->24V...

  • Page 30: High Frequency Llc Resonant Converter

    Simplified schematic of the LLC DC/DC converter in REF_8KW_HFHD_PSU The primary full bridge (FB) of the LLC uses Infineon’s CoolGaN™ technology to reduce driving losses, and is hosted on a dedicated daughter card on the main board as previously mentioned. The two resonant capacitors are on the main board, which also provide the connection path to the two high-frequency transformers.
  • Page 31 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 31 LLC DC/DC standalone: Efficiency and power losses at 400 V input Figure 32 shows an estimation of the breakdown of the power losses for the LLC converter only. The main contributors to power losses are conduction losses of the primary side, the synchronous rectifiers, and total copper losses of the series and parallel inductance, and of the main transformer itself.

  • Page 32: Llc Integrated Transformer And Inductors

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 33 Power loss breakdown for the LLC DC-DC stage at 50% of rated power 3.2.2 LLC integrated transformer and inductors Because of the height limitation of the PSU (40 mm), a cutout in the main board is made to accommodate the higher transformer (XFMR B shown in Figure...
  • Page 33 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 34 Detailed stack-up of XFMR A (transformer and parallel resonant inductor B integrated) Figure 35 Detailed stack-up of XFMR B (transformer, series, and parallel resonant inductors A integrated) The two XFMRs have dimensions of 35 mm ×...
  • Page 34 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description meaning there are two sets of three primary boards. In each set, the three primary boards are in parallel, and the resulting two sets are arranged in series. Considering that each primary board realizes four turns and each secondary realizes two turns, this arrangement allows to realize an 8:2 turn ratio for each of the two transformers, resulting in a 16:2 turn ratio when XFMR A and XFMR B are in series on the main board.

  • Page 35: Driving Coolgan™ And Optimos™ Switches

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 37 An overview of the primary- and secondary-side winding PCBs Figure 38 Detail of the primary side PCB: Winding arrangement for each board Figure 39 Detail of the secondary side PCB: Winding arrangement for each board 3.2.3...
  • Page 36 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description HSonA HSoffA HSonA IGT65R035D2 IGT65R035D2 SGND HS_VCC_A VCC2 GND1 SGND 100pF HSKS_A Out+ HSonA SGND Out- HSoffA PWM_LLC_HS SRF2012-361Y A GND2 VCC1 PRI_12V SRF2012-361Y A...

  • Page 37: Hold-Up Time Extension, Inrush And Re-Rush Current Control

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description IQE03XN08LM6CG IQE03XN08LM6CG GND_sec GNDI VDDA PWM_A_SEC OUTA Sec_1 PWM_B_SEC GNDA VDDI BAT46WJ GND_sec 100V DISABLE VDDB IQE03XN08LM6CG IQE03XN08LM6CG GND_sec STP/DTC OUTB VDDI GNDB 2EDB7259K...
  • Page 38 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description The baby-boost circuit operates at a switching frequency of 190 kHz, and it is disabled if one of the following conditions is triggered: If the grid voltage is lost for >20 ms: Timing limitation is applied to the baby boost to stop the PSU from •...
  • Page 39 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Topology blocks description Figure 44 Baby-boost operation during LCDO event at 100% load Application note V 1.0 2025-03-20...

  • Page 40: Experimental Results

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Experimental results Steady-state performance 4.1.1 PSU efficiency and power losses Figure 45 recalls the efficiency measurements for steady-state operation of the full PSU at different AC voltages already presented in Section 2.6.

  • Page 41: Psu Startup

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 46 Power factor (PF) of the PSU and OCP power factor limit Figure 47 Input current total harmonic distortion (iTHD) of the PSU and OCP iTHD limit 4.1.3 PSU startup Complete PSU startup is achieved within 1.2 s after the AC grid voltage is applied to the unit.
  • Page 42 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 48 PSU startup at 230 V input, full load Startup of the LLC converter is shown in detail in Figure 49. The startup starts with 15 open loop pulses, with the first one asymmetric and shorter (1/4 T ) to reduce peak current.

  • Page 43: Output And Bulk Voltage Ripple

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results 4.1.4 Output and bulk voltage ripple Figure 50 shows the PSU waveforms during steady state operation at 230 V input, full load. VTP voltage (equal to V in steady state), 50 V LLC output voltage, PFC stage A, and LLC resonant currents are shown.
  • Page 44 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 51 Bulk voltage ripple at 100% load, 230 V (a) and 277 V input voltage (b) Figure 51 shows the PSU output voltage ripple, together with the AC input voltage and current. The voltage at the output is measured by means of a passive probe with a 100 MHz bandwidth.

  • Page 45: Bridgeless Interleaved Totem-Pole Pfc

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results 4.1.5 Bridgeless interleaved totem-pole PFC Figure 53 PFC steady-state operation at 230 V , full load Figure 54 PFC steady-state operation at 180 V , full load Application note V 1.0...

  • Page 46: Half-Bridge Llc

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 55 PFC zero crossing A Figure 56 PFC zero crossing B 4.1.6 Half-bridge LLC The FB/FB LLC converter uses CoolGaN™ IGT65R035D2 on the primary side and IQE033N08LM6CG for the secondary synchronous rectification stage.

  • Page 47: Thermal Performance

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 57 LLC waveforms during steady-state operation, full load, 230 V input, V at minimum bulk peak of the double line frequency ripple (395 V) Figure 58 LLC waveforms during steady-state operation, full load, 230 V input, V...
  • Page 48 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 59 PSU airflow direction Figure 60 Airflow velocity magnitude - cross section close to PSU ceiling Figure 61 Airflow velocity magnitude - cross section at PSU center PSU hotspot temperatures Table 5 XFMR-A...

  • Page 49: Dynamic Performance

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Dynamic performance 4.2.1 Output load transients REF_8KW_HFHD_PSU has been tested for load transients, from 10-50% and from 10-90% (and vice versa), with a 1 A/µs slew rate and a 10 Hz repetition rate as shown in Figure 62.

  • Page 50: Ac Input Voltage Sag

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 64 PSU load transient at 10-50% (a) and 50-10% (b) output load, detailed view 4.2.2 AC input voltage sag REF_8KW_HFHD_PSU has been tested for AC line transients of 230 V/180 V RMS and 230 V/160 V RMS for a time duration of 500 ms.

  • Page 51: Hold-Up Time Extension And Re-Rush Current Limit Circuits

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 66 AC input voltage sag, 230 V to 160 V , 100% output load 4.2.3 Hold-up time extension and re-rush current limit circuits REF_8KW_HFHD_PSU implements a baby-boost circuit to meet 20 ms hold-up time requirements.

  • Page 52: Emi Measurements

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 68 Hold-up time at 100% of the rated load with LCDO duration ≤20 ms Figure 69 Detail of baby-boost V , and V waveforms during an LCDO event, 4.3 ms (a) and bulk 20 ms (b) after grid drop event...
  • Page 53 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 70 Setup used for EMI test With the setup discussed, noise floor has been observed even with the DUT connected but not powered. The measured noise floor has been then measured and reported in Figure 71.
  • Page 54 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 71 Noise floor in EMI setup measured with DUT connected and OFF, and EN 55032 limits Application note V 1.0 2025-03-20...
  • Page 55 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Experimental results Figure 72 EMI measurements of the DUT at 230 V - 8 kW, and EN 55032 limits Application note V 1.0 2025-03-20...

  • Page 56: Summary

    REF_8KW_HFHD_PSU Summary Summary This document provides a complete system solution from Infineon designed for AI data center and server PSU applications. The solution incorporates a bridgeless interleaved totem-pole PFC converter and a DC-DC isolated full-bridge LLC converter, achieving a peak efficiency of 97.5%, and a minimum full load efficiency of 96.5% at 230 V including fan power consumption.

  • Page 57: List Of Figures

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU List of figures List of figures REF_8KW_HFHD_PSU ............... 1 IGURE VERVIEW OF THE POWER SUPPLY UNIT REF_8KW_HFHD_PSU ......2 IGURE MEASURED EFFICIENCY INCLUDING FAN POWER CONSUMPTION REF_8KW_HFHD_PSU IGURE IMENSIONS OF THE...
  • Page 58 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU List of figures 100% , 230 V ....43 IGURE RESONANT AND CURRENTS AND OUTPUT AND BULK VOLTAGES AT LOAD , 230 V 277 V ) ......

  • Page 59: Bill Of Materials

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Bill of materials Bill of materials for the main board M100001428 Table 6 Designator Value Tolerance Description C1, C2, C13, C14 4.7 nF Capacitor ceramic C3, C4, C37, C54...
  • Page 60 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Designator Value Tolerance Description IC3, IC5 1EDB8275F – Integrated circuit LM5050-1 – O-ring gate driver IC 4DIR1400H – Integrated circuit LV3842X –...
  • Page 61 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Designator Value Tolerance Description Resistor R76, R77, R78, R79, R80, R81, R82, R83, R84, R85, R86, R87, R88, R89, R90, R91 309k 0.1% Resistor...
  • Page 62 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Designator Value Tolerance Description LM317EMP/NOP IC11 – Integrated circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 IMT65R040M2H – GIT GaN transistor Q9, Q10, Q11, Q12 IMT65R015M2H –...
  • Page 63 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Designator Value Tolerance Description IC2, IC4 1EDN8550B – Gate driver IC IC1, IC3 1EDB8275F – Integrated circuit D1, D10 BAT165 – Schottky diode 330 pF Capacitor ceramic...
  • Page 64 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Bill of materials Designator Value Tolerance Description R4, R7, R51, R55, R59 49k9 0.10% Resistor R5, R6, R48, R56, R63 Resistor R8, R31 510R Resistor 261R Resistor...

  • Page 65: Schematics

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Schematics Figure 73 Schematic of the main board (M100001428) – page 1 Application note V 1.0 2025-03-20...
  • Page 66 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Figure 74 Schematic of the main board (M100001428) – page 1 Application note V 1.0 2025-03-20...
  • Page 67 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Figure 75 Schematic of the PFC power board (PW200001428) Application note V 1.0 2025-03-20...
  • Page 68 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Figure 76 Schematic of the LLC power board (PW100001427) Application note V 1.0 2025-03-20...
  • Page 69 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Figure 77 Schematic of the LLC control board (CD100001427) Application note V 1.0 2025-03-20...
  • Page 70 8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Schematics Figure 78 Schematic of the LLC secondary side winding embedding the SR bridge (MG100001429) Application note V 1.0 2025-03-20...

  • Page 71: References

    “Differential-Mode Inductance Integration with Common-Mode EMI Filter,” M. Chen, M. Escudero, M. A. Kutschak, D. Meneses, APEC 2024 “Paralleling power MOSFETs in high current applications,” AN_2009_PL18_2010_105641, Infineon technologies AG B. Li, Q. Li, F. C. Lee and Y. Yang, “A symmetrical resonant converter and PCB transformer structure for common mode noise reduction,”...

  • Page 72: Acronyms/Abbreviations

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Acronyms/abbreviations Acronyms/abbreviations Table 11 Acronyms/abbreviations Acronym Description analog to digital converter bandwidth PCB bottom side continuous conduction mode duty feed-forward full-bridge gallium nitride half-bridge high voltage Intermediate bus converter iTHD...

  • Page 73: Revision History

    8 kW high power density and high frequency PSU for AI data centers and servers REF_8KW_HFHD_PSU Revision history Revision history Document Date Description of changes revision V 1.0 2025-03-20 Initial release Application note V 1.0 2025-03-20...

  • Page 74: Disclaimer

    Infineon Technologies hereby Infineon Technologies’ products may not be used in disclaims any and all warranties and liabilities of any applications where a failure of the product or any any kind (including without limitation warranties of © 2025 Infineon Technologies AG.

Table of Contents

Save PDF