Less than 90mW Ultra-low Standby Power Auxless AC-DC Power Supply Reference Design


Design files


The PMP21251 reference design uses UCC28056 CRM/DCM PFC controller and UCC256304 enhanced LLC controller with integrated driver to provide 12V/10.8A output (continuous, 14.4A peak) from universal AC input. This design achieves 92.4% peak efficiency at 115VAC input and 94.0% peak efficiency at 230VAC input. The efficiency and power factor numbers also meet both 115V and 230V internal 80 PLUS gold specifications and DoE level VI requirement. In addition, the design is able to achieve as low as 89mW power consumption at 230VAC input and no load without turning off PFC. 

  • No load power consumption as low as 89mW @ 230VAC without shutdown PFC
  • Compact 54mm x 141mm x 30mm board  dimension
  • Less than 20% THD with above 20% load
  • 80 PLUS Gold compatible performance
  • Four-point efficiency to be 91.6% at 115V, 93.0% at 230V
Output voltage options PMP21251.1 PMP21251.2
Vin (Min) (V) 90 300
Vin (Max) (V) 264 400
Vout (Nom) (V) 385 12
Iout (Max) (A) .5 14.4
Output Power (W) 192.5 172.8
Isolated/Non-Isolated Non-Isolated Isolated
Input Type AC DC
Topology Boost- PFC Full Bridge- Resonant

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.

TIDUE51A.PDF (4624 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


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

TIDRVK1.ZIP (1479 K)

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

TIDCEH5.ZIP (2329 K)

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

TIDRVK0.PDF (1527 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


TL331High Voltage Single Differential Comparator

Data sheet: PDF | HTML
Current sense amplifiers analog output

INA18026V, 350kHz current sense amplifier

Data sheet: PDF | HTML
LLC controllers

UCC256304Wide vin LLC resonant controller with high-voltage start up enabling low standby power

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS71550-mA, 24-V, ultra-low-IQ, low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18501Q5A40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 mOhm

Data sheet: PDF | HTML
Power factor correction (PFC) controllers

UCC280566-pin high-performance CrM & DCM PFC controller

Data sheet: PDF | HTML
SR & load share controllers

UCC24612High-frequency multi-mode synchronous rectifier controller

Data sheet: PDF | HTML
Shunt voltage references

TLVH431A1% low-voltage wide-operating current adjustable precision shunt regulator

Data sheet: PDF | HTML
Temperature switches

TMP300Resistor-Programmable, up to 18V-Capable Temp Switch and Analog Out Sensor

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP21251 Test Results (Rev. A) Feb. 27, 2018
Technical article Crank up your power supply with LLC controllers Oct. 23, 2017

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