36W, Universal Input, >90% Efficiency, Dual Output Aux Supply Ref Design for PSU


Design files


TIDA-00709 is a 36-W dual-output auxiliary power supply with provision to accept both wide ranges of DC and AC inputs. Based on the input, this reference design can be used as an adapter or auxiliary power supply designed for use in power converters targeted for server, telecom and industrial system applications. This reference design is a quasi-resonant (QR) flyback converter implemented using UCC28740 constant voltage-constant current (CV-CC) flyback controller with optocoupled feedback for voltage and primary-side regulation (PSR) for current. For improved efficiency, TIDA-00709 uses synchronous rectification with sync controller UCC24636 and low RDS(on) MOSFET for main 12- V_ISO/2.75-A output. Hardware is designed and tested to pass conducted emissions, surge and EFT requirements. Additionally, the design has a built-in eFuse for multiple fault isolation for main output rail without affecting any other output.

  • High efficiency of > 90% with AC input and > 92% with DC input
  • Minimum efficiency > 86.5% at 10% load aids to meet 80Plus titanium standard of server PSUs
  • Low standby power (≈ 120 mW) aids to meet NoLoad condition limits of DoE Level VI and EU CoC Tier-I
  • Compact form-factor to achieve high-power density solutions: – DC/DC: 40 mm × 45 mm – AC/DC: 70 mm × 45 mm
  • Dual output: 12 V/0.25 A and 12 V_ISO/2.75 A
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUC68A.PDF (2621 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDROE7.ZIP (4004 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
N-channel MOSFETs

CSD19531Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.4 mOhm

Data sheet: PDF | HTML
SR & load share controllers

UCC24636Synchronous rectifier controller With Ultra-Low Standby current

Data sheet: PDF | HTML
Shunt voltage references

ATL4312.5-V low-IQ adjustable precision shunt regulator

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS259244.5-V to 13.8-V, 28mΩ, 1-5A eFuse with driver for external blocking FET

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide 36W, Universal Input, >90% Efficiency, Dual Output Aux Supply Ref Design for PSU (Rev. A) Feb. 06, 2017
Application note Designing with the ATL431LI Nov. 27, 2018
More literature Snubbing the flyback converter Nov. 07, 2016
Application note Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application Feb. 15, 2001

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