1-kW digital-controlled current mode LLC reference design


Design files


This reference design is an industry-first digital hybrid hysteretic control (HHC) solution, targeting server PSU applications with 12-V to 54-V output. This reference design shows the HHC control advantages by UCD3138, in a 400-V to 12-V 1-kW LLC power stage. This design achieves 8-kHz peak loop bandwidth. It holds less than 500-mV peak-to-peak deviation under 0% and 100% load translation with 2.5 A/us, and less than 800-mV peak-to-peak deviation under 0% and 150% load translation with 2.5 A/us.

  • High load transient performance
  • Monotonic startup with any load condition
  • Burst mode for power saving in light load
  • Integrated SR control for secondary MOSFET
  • Low audio susceptibility suppressing input voltage ripple
  • Configurable deadtime
Output voltage options PMP40586.1
Vin (Min) (V) 340
Vin (Max) (V) 420
Vout (Nom) (V) 12
Iout (Max) (A) 84
Output Power (W) 1008
Isolated/Non-Isolated Isolated
Input Type DC
Topology Half Bridge- LLC
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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.

TIDT334.PDF (2773 K)

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

TIDMBV8.ZIP (1280 K)

Detailed schematic diagram for design layout and components


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

TIDMBW2.ZIP (6991 K)

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

TIDCGH4.ZIP (22096 K)

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

TIDMBW1.ZIP (5103 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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AND gates

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Analog temperature sensors

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High-speed op amps (GBW ≥ 50 MHz)

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Ideal diode/ORing controllers

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Isolated gate drivers

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Low-side drivers

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CSD16570Q5B25-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 0.82 mOhm

Data sheet: PDF | HTML

CSD18510Q5B40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 0.96 mOhm

Data sheet: PDF | HTML
Power modules (integrated inductor)

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Precision op amps (Vos<1mV)

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Shunt voltage references

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Technical documentation

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Type Title Date
Technical article 실시간 제어 기술로 안정적이고 확장 가능한 고전압 설계를 구 현하는 방법 PDF | HTML Jul. 03, 2024
Technical article 即時控制技術如何實現可靠、可擴充的高電壓設計 PDF | HTML Jul. 01, 2024
Technical article How real-time control technologies enable reliable, scalable high-voltage designs PDF | HTML Jun. 07, 2024
Test report 1-kW Digital-Controlled Current Mode LLC Reference Design PDF | HTML Sep. 26, 2023

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