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Non-USB AC/DC adapter

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Block diagram

Non-USB AC/DC adapter

Block diagram

Overview

Our integrated circuits and reference designs help you create non-USB AC/DC adapter designs with high-power density and higher efficiency to meet Energy Star® standards at a competitive cost.

Design requirements

  • Lower standby power and leakage current.
  • Protection for voltage, current and short circuit.
  • Wider input voltage range with low total harmonic distortion (THD) throughout load and line.
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Block diagram

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Analog-controlled AC/DC adapter

Digital-controlled AC/DC adapter

Digital-controlled AC/DC adapter

AC Mains 1-Ph AC Mains 1-Ph Vout Vout PFC stage PFC stage HV-MOSFET HV-MOSFET PFC controller PFC controller Isolated DC/DC stage Isolated DC/DC stage HV-MOSFET HV-MOSFET PWM controller PWM controller VREF VREF Amplifier Amplifier Filter and rectifier Filter and rectifier EMI filter EMI filter Rectifier bridge Rectifier bridge

Isolated DC/DC power stage

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Isolated DC/DC Stage is the main power conversion stage and is required to convert the high DC voltage obtained at the output of PFC to 5V/9V/12V/15V/20V etc. This stage contains high voltage MOSFET, flyback controller and voltage reference and should be capable of handling a wide input range and delivering consistent high power at a high efficiency.

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Power management (11)
Gallium nitride (GaN) power stages
  • LMG3522R030-Q1—Automotive 650-V 30-mΩ GaN FET with integrated driver, protection and temperature reporting
    Data sheet: PDF | HTML
  • LMG3622—650V 120mΩ GaN FET with integrated driver, protection and current sensing
    Data sheet: PDF | HTML
Shunt voltage references
  • ATL432LI—High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA)
    Data sheet: PDF | HTML
  • TLA431—All-capacitor stable precision programmable reference with KRA pin layout
    Data sheet: PDF | HTML
  • LM431—2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator
    Data sheet: PDF | HTML
  • LM4050-N—50-ppm/°C precision micropower shunt voltage reference
    Data sheet: PDF | HTML
  • ATL431LI—Low-IQ programmable shunt regulator offered in an ultra-small DQN package
    Data sheet: PDF | HTML
  • TL431—Adjustable precision shunt regulator
    Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)
  • UCC25600—8-pin high-performance resonant mode LLC controller
    Data sheet: PDF | HTML
MOSFETs
  • CSD18514Q5A—40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.9 mOhm
    Data sheet: PDF | HTML
  • CSD17575Q3—30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 3.2 mOhm
    Data sheet: PDF | HTML
Amplifiers (7)
Analog current-sense amplifiers
  • INA296A—-5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier
    Data sheet: PDF | HTML
  • INA181—26-V bi-directional 350-kHz current-sense amplifier
    Data sheet: PDF | HTML
General-purpose op amps
  • TL103WB—Dual, 36-V 1.2-MHz low-offset-voltage operational amplifier with internal reference
    Data sheet: PDF | HTML
  • OPA310—Single, 5.5-V, 3-MHz high-output-current (150 mA) fast-shutdown (1 μs) operational amplifier
    Data sheet: PDF | HTML
  • TLV9101—Single, 16-V, 1.1-MHz, low-power operational amplifier
    Data sheet: PDF | HTML
Comparators
  • TLV6700—Low power window comparator with integrated reference
    Data sheet: PDF | HTML
  • LM2901B—36-V, quad differential standard comparator
    Data sheet: PDF | HTML
Isolation (2)
Isolated amplifiers
  • AMC3330—±1-V input, precision voltage sensing reinforced isolated amplifier with integrated DC/DC
    Data sheet: PDF | HTML
  • AMC1311—2-V input, precision voltage sensing reinforced isolated amplifier
    Data sheet: PDF | HTML
  • PMP8920—High-Eff 2Stage Univ Input Pwr Supply Using Trans Mode PFC/LLC Resonant Conv Reference Design
    Test report: PDF Schematic: PDF
  • TIDA-00701—100W, 24V High Efficiency High PF Industrial Power Supply with Precision Current & Power Limit
    Design guide: PDF Schematic: PDF
  • TIDA-010047—22-W/in3, 93.1% peak efficiency, 100-W USB-PD 3.0 AC/DC adapter reference design with Si MOSFET
    Design guide: PDF Schematic: PDF
  • TIDA-01623—30-W/in3, 93.4% efficiency, 100-W AC/DC adapter reference design
    Design guide: PDF Schematic: PDF

Technical documentation

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Type Title Date
Application note Analysis and Measurement of Resonant Tank Current on LLC 30 Jul 2013
Technical article Gain ultra-high power density for 100-W USB Power Delivery adapters PDF | HTML 29 Jun 2023
Application note Designing with the ATL431LI 27 Nov 2018
Application note Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A) 27 Jan 2020
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 18 Dec 2014
White paper GaN and SiC technologies enable increased efficiency in power supplies 14 Dec 2021
Analog Design Journal Design a transition-mode, bridgeless PFC with a standard PFC controller 11 Nov 2014
Application note Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. B) 10 May 2022
Application brief Increasing Power Density With Active Clamp Flyback (UCC28780) 10 May 2022
Analog Design Journal MOSFET power losses and how they affect power-supply efficiency 02 Feb 2016
Application brief Exceeding Modern Energy Standards with 'Always On' PFC and LLC Controllers​ (Rev. B) 01 Aug 2019

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