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Open rack server PSU

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Block diagram

Open rack server PSU

Block diagram

Overview

Our integrated circuits and reference designs help you create compact rack and server power supply units (PSUs) with 48-V of high-energy efficiency across a wide-load range aimed to meet 80+ titanium standards.

Design requirements

  • Higher efficiency (80+ titanium) across 20-80% load range with soft-switching, bridgeless PFC or GaN.
  • Compact size and high power density for data-center applications.
  • Digital solution with PMBus for scalability and connectivity.
Explore applications similar in function and design

Block diagram

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Open rack server PSU

Communication interface Communication interface ESD ESD MODBus MODBus PMBus PMBus CAN CAN Isolator Isolator HVDC HVDC Prebias Prebias 12V DC for fan 12V DC for fan 54V DC 54V DC Output protection Output protection ORing controller ORing controller MV-FET MV-FET Fan power Fan power Buck converter Buck converter MV-FET MV-FET Auxiliary power supply Auxiliary power supply Flyback controller Flyback controller LDO LDO HV-FET HV-FET Buck converter Buck converter MV-FET MV-FET DC/DC stage DC/DC stage HV-FET HV-FET Current sense Current sense DC/DC / house- keeping controller DC/DC / house- keeping controller SR driver SR driver MV-FET MV-FET Amp Amp Temperature sensor Temperature sensor AFE AFE Isolator Isolator PFC stage PFC stage HV-FET HV-FET VREF VREF PFC controller PFC controller Gate driver Gate driver Isolator Isolator Amp Amp Logic Logic Temperature sensor Temperature sensor AFE AFE Current sense Current sense AC/DC EMI filter AC/DC EMI filter EMI filter EMI filter

PFC stage

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The PFC stage is required to shape the input current of the power supply and to meet the power factor and current THD norms such as 80 Plus/IEC61000-2-3. In addition, the PFC stage also enhances system performance by reducing RMS input current, facilitating power supply holdup and improving the efficiency of downstream converters.

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Microcontrollers (MCUs) & processors (6)
C2000 real-time microcontrollers
Power management (33)
AC/DC & DC/DC controllers (external FET)
  • UCD3138128A—Highly-Integrated Digital Controller For Isolated Power
    Data sheet: PDF | HTML
  • UCD3138128—Highly-Integrated Digital Controller for Isolated Power
    Data sheet: PDF | HTML
  • UCD3138A64—Highly-Integrated Digital Controller for Isolated Power
    Data sheet: PDF | HTML
  • UCD3138064A—Highly Integrated Digital Controller for Isolated Power
    Data sheet: PDF | HTML
  • UCD3138064—Highly-Integrated Digital Controller for Isolated Power with 64kB Memory
    Data sheet: PDF | HTML
  • UCD3138—Highly Integrated Digital Controller for Isolated Power with 3 Feedback Loops and 8 DPWM Outputs
    Data sheet: PDF | HTML
Isolated power modules (integrated transformer)
  • UCC33420—5V/5V 1.5W 3kVrms isolated DC-DC module with integrated transformer
    Data sheet: PDF | HTML
  • UCC33410—5V to 3.3V, 1W, 3kVrms isolated DC-DC module with integrated transformer
    Data sheet: PDF | HTML
  • DCH010505S—Miniature, 1W, 3kVDC Isolated DC/DC Converters
    Data sheet: PDF | HTML
Isolated gate drivers
  • UCC21330—3kVRMS 4A/6A two-channel isolated gate driver with disable logic and programmable deadtime
    Data sheet: PDF | HTML
  • UCC21550—4A/6A, 5-kVRMS dual-channel isolated gate driver with DIS and DT pins for IGBT
    Data sheet: PDF | HTML
  • UCC21225A—2.5kVrms, 4A/6A dual-channel isolated gate driver with dual input, 5V UVLO & LGA package
    Data sheet: PDF | HTML
  • UCC5350—5A/5A single-channel isolated gate driver with Miller clamp or split outputs and 8V or 12V UVLO
    Data sheet: PDF | HTML
  • UCC21750—5.7kVrms ±10A, single-channel isolated gate driver w/ DESAT & internal miller clamp for IGBT/SiCFETs
    Data sheet: PDF | HTML
  • UCC21220—3.0kVrms, 4A/6A dual-channel isolated gate driver with disable pin & 8V UVLO for MOSFETs & GaNFETs
    Data sheet: PDF | HTML
Gallium nitride (GaN) power stages
  • LMG3100R017—100V 1.7mΩ GaN FET with integrated driver
    Data sheet: PDF | HTML
  • LMG3427R030—600V 30mΩ GaN FET with integrated driver, protection and zero-current detection
    Data sheet: PDF | HTML
  • LMG3522R050—650-V 50-mΩ GaN FET with integrated driver, protection and temperature reporting
    Data sheet: PDF | HTML
  • LMG3422R050—600-V 50-mΩ GaN FET with integrated driver, protection and temperature reporting
    Data sheet: PDF | HTML
  • LMG3422R030—600-V 30-mΩ GaN FET with integrated driver, protection and temperature reporting
    Data sheet: PDF | HTML
  • LMG3410R070—600-V 70mΩ GaN with integrated driver and protection
    Data sheet: PDF | HTML
Low-side drivers
  • UCC27624—5A/5A dual-channel gate driver with 4V UVLO, 30V VDD and low propagation delay
    Data sheet: PDF | HTML
  • UCC27511A—4-A/8-A single-channel gate driver with 5-V UVLO, split outputs, 5-V IN handling
    Data sheet: PDF | HTML
  • UCC27524—5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and 1-ns delay Matching
    Data sheet: PDF | HTML
  • UCC27511—4-A/8-A single-channel gate driver with 5-V UVLO, split outputs, and 13-ns Prop delay
    Data sheet: PDF | HTML
  • UCC27424—4-A/4-A dual-channel gate driver with enable and 5-V IN handling
    Data sheet: PDF | HTML
  • UCC27525—5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and inverting/non-inverting inputs
    Data sheet: PDF | HTML
Half-bridge drivers
  • UCC27282—3-A, 120-V half-bridge gate driver with 5-V UVLO, interlock and enable
    Data sheet: PDF | HTML
  • UCC27211A—4-A, 120-V half bridge gate driver with 8-V UVLO and negative voltage handling
    Data sheet: PDF | HTML
  • UCC27201A—3-A, 120-V half bridge gate driver with 8-V UVLO and negative voltage handling
    Data sheet: PDF | HTML
  • UCC27714—4-A, 600-V half bridge gate driver
    Data sheet: PDF | HTML
  • UCC27201—3-A, 120-V half bridge gate driver with 8-V UVLO and TTL inputs
    Data sheet: PDF | HTML
  • UCC27712—1.8-A/2.8-A, 620V half bridge driver with interlock
    Data sheet: PDF | HTML
Isolation (3)
Transformer drivers
  • SN6507—Low-emission 36-V push-pull transformer driver with duty cycle control for isolated power supplies
    Data sheet: PDF | HTML
  • SN6505B—Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies
    Data sheet: PDF | HTML
  • SN6501—Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies
    Data sheet: PDF | HTML
Amplifiers (18)
Precision op amps (Vos<1mV)
  • OPA4325—Low noise (10nV/rtHz), wide bandwidth (10MHz), low power (0.65mA), quad zero crossover op amp
    Data sheet: PDF | HTML
  • OPA182—Highest-precision, 36-V, 5-MHz, single, low-noise, zero-drift, MUX-friendly amplifier
    Data sheet: PDF | HTML
  • OPA392—Single, low-offset (10 μV), low-noise (4.4 nV/rtHz @10kHz) femtoamp-bias-current e-trim™ op amp
    Data sheet: PDF | HTML
  • OPA2192—36-V, Precision, RRIO, Low Offset Voltage, Low Input Bias Current Op Amp With e-trim
    Data sheet: PDF | HTML
  • OPA2182—Industry’s lowest offset drift (0.012 uV/˚C, max), 5.7 nV/rtHz, MUX-friendly 36V op amp
    Data sheet: PDF | HTML
  • OPA2209—Dual, 2.2-nV/rtHz, 18-MHz, precision, RRO, 36-V operational amplifier
    Data sheet: PDF | HTML
General-purpose op amps
  • TLV9151—Single, 16-V, 4.5-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
  • LM2904B—Dual, 36-V, 1.2-MHz operational amplifier with -40°C to 125°C operation
    Data sheet: PDF | HTML
  • TLV9162—Dual, 16V, 11MHz, rail-to-rail input and output low-offset-voltage low-noise operational amplifier
    Data sheet: PDF | HTML
  • OPA2992—Dual, 40V, 10.6MHz, rail-to-rail input and output low-offset-voltage low-noise op amp
    Data sheet: PDF | HTML
  • TLV9354—Quad, 40-V, 3.5-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
  • TLV9152—Dual, 16-V, 4.5-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)
  • OPA2365—2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers
    Data sheet: PDF | HTML
  • OPA365—2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier
    Data sheet: PDF | HTML
  • OPA863A—Single-channel, high-precision, low-power, 105-MHz, 12-V RRIO voltage-feedback amplifier
    Data sheet: PDF | HTML
  • OPA2836—Dual, Very Low Power, Rail to Rail out, Negative Rail in, VFB Op Amp
    Data sheet: PDF | HTML
  • LMP7717—Single Channel, 88 MHz, Precision, Low Noise, 1.8V CMOS Input, Decompensated Amplifier
    Data sheet: PDF | HTML
  • OPA607—Low power, precision, 50 MHz decompensated CMOS operational amplifier for cost sensitive systems
    Data sheet: PDF | HTML
  • PMP20873—99% Efficient 1kW GaN-based CCM Totem-pole Power Factor Correction (PFC) Converter Reference Design
    Test report: PDF Schematic: PDF Schematic: PDF
  • PMP22220—1500-W AC switch bridgeless PFC reference design
    Test report: PDF | HTML Schematic: PDF
  • PMP23069—3-kW, 180-W/in3 single-phase totem-pole bridgeless PFC reference design with 16-A max input
    Test report: PDF | HTML Schematic: PDF
  • PMP23338—3.6kW single-phase totem-pole bridgeless PFC reference design with e-meter functionality
    Test report: PDF | HTML Schematic: PDF
  • PMP40690—4-kW interleaved CCM totem pole bridgeless PFC reference design using C2000™ MCU and GaN
    Test report: PDF Schematic: PDF
  • PMP40988—Variable-frequency, ZVS, 5-kW, GaN-based, two-phase totem-pole PFC reference design
    Test report: PDF | HTML Schematic: PDF
  • TIDA-00707—1kW, Compact, 97.5% Efficiency, Digital PFC Reference Design for Telecom and Server PSU with E-Meter
    Design guide: PDF Schematic: PDF
  • TIDA-010203—4-kW single-phase totem pole PFC reference design with C2000 and GaN
    Design guide: PDF | HTML Schematic: PDF
  • TIDM-02011—Live firmware update reference design with C2000™ real-time MCUs
    Design guide: PDF | HTML Schematic: PDF
  • TIDM-1000—Vienna Rectifier-Based Three Phase Power Factor Correction Reference Design Using C2000 MCU
    Design guide: PDF | HTML Schematic: PDF
  • TIDM-1022—Valley switching boost power factor correction (PFC) reference design
    Design guide: PDF | HTML Schematic: PDF
  • TIDM-2PHILPFC—Two-Phase Interleaved Power Factor Correction Converter Reference Design with Power Metering
    Design guide: PDF Schematic: PDF Schematic: PDF

Technical documentation

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Type Title Date
White paper Impact of an isolated gate driver (Rev. A) 28 Feb 2019
Analog Design Journal Improve power density with a baby boost converter in a PFC circuit PDF | HTML 25 Aug 2022
White paper Design considerations of GaN devices for improving power converter efficiency 20 Nov 2017
Application brief Overcurrent Protection in High-Density GaN Power Designs 19 Oct 2018
White paper 簡化高壓系統的電源轉換 PDF | HTML 17 Nov 2023
White paper 고전압 시스템의 전력 변환 간소화 PDF | HTML 17 Nov 2023
Application note Digital Isolator Design Guide (Rev. G) PDF | HTML 13 Sep 2023
Analog Design Journal Achieving high converter efficiency with an active clamp in a PSFB converter PDF | HTML 13 Mar 2023
Analog Design Journal Achieving high converter efficiency with an active clamp in a PSFB converter PDF | HTML 13 Mar 2023
Analog Design Journal A comparative analysis of topologies for a bridgeless-boost PFC circuit 13 Jul 2018
Application note Thermal Considerations for Designing a GaN Power Stage (Rev. B) 11 May 2022
Analog Design Journal Control challenges in a totem-pole PFC 10 May 2017
White paper Simplifying Power Conversion in High-Voltage Systems PDF | HTML 09 Nov 2023
White paper Simplifying Power Conversion in High-Voltage Systems PDF | HTML 09 Nov 2023
White paper A comprehensive methodology to qualify the reliability of GaN products 09 Mar 2015
Analog Design Journal 在 PSFB 轉換器中以主動箝位實現高轉換器效率 PDF | HTML 05 Jun 2023
Analog Design Journal PSFB 컨버터에서 액티브 클램프로 높은 컨버터 효율 달성 PDF | HTML 05 Jun 2023
Analog Design Journal How to reduce current spikes at AC zero-crossing for totem-pole PFC 02 Nov 2015

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