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PMP23486

1.2W LLC isolated bias supply reference design using sector wound planar transformer

Design files

PMP23486

Design files

Overview

This 1.2W isolated reference design provides approximately 24V of 50mA from a 12V automotive power source. The output voltage is split using a Zener regulator to +18V with –5V for an insulated gate bipolar transistor (IGBT) gate drive. The circuit uses the UCC25800-Q1 half-bridge LLC transformer driver operating at a nominal switching frequency of 500kHz. The secondary-side resonant tank frequency is set slightly above the switching frequency to produce a flat gain. For this open-loop design, the output voltage is proportional to the input voltage by the transformer turns ratio. The transformer windings are integrated into the printed circuit board (PCB) and sector wound for no overlap. The result is very low interwinding capacitance and common-mode current, along with high isolation voltage.

Features
  • Sector wound planar transformer integrated into the PCB
  • Low-profile 6.3mm overall height set by transformer core
  • Output voltage is proportional to input voltage
  • 500kHz switching frequency for small size
  • Fixed frequency LLC for low EM
  • Functional safety-capable
Output voltage options PMP23486.1
Vin (Min) (V) 12
Vin (Max) (V) 12
Vout (Nom) (V) 18
Iout (Max) (A) .05
Output Power (W) .9
Isolated/Non-Isolated Isolated
Input Type DC
Topology Half Bridge- LLC
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Design files & products

Design files

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

download Test report — PMP23486
PDF | HTML
TIDT393.PDF (532 KB)

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

download Assembly drawing — PMP23486
TIDMD89.PDF (183 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — PMP23486
TIDMD88.PDF (150 KB)

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

download CAD/CAE symbol — PMP23486
TIDMD91.ZIP (592 KB)

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

download Gerber file — PMP23486
TIDCGR2.ZIP (450 KB)

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

download PCB layout — PMP23486
TIDMD90.PDF (544 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — PMP23486
TIDMD87.PDF (256 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

AC/DC controllers

UCC25800-Q1 — Ultra-low EMI transformer driver for isolated bias supplies

Data sheet: PDF | HTML

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Hardware development

Evaluation board

UCC25800EVM-037 — UCC25800 evaluation module for 2-W LLC converter with 6-V to 26-V DC input and 18-V and 5-V outputs

This 1.2W isolated reference design provides approximately 24V of 50mA from a 12V automotive power source. The output voltage is split using a Zener regulator to +18V with –5V for an insulated gate bipolar transistor (IGBT) gate drive. The circuit uses the UCC25800-Q1 half-bridge LLC transformer (...)
Supported products & hardware

Supported products & hardware

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Reference design
PMP23486 — 1.2W LLC isolated bias supply reference design using sector wound planar transformer
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UCC25800EVM-037 — UCC25800 evaluation module for 2-W LLC converter with 6-V to 26-V DC input and 18-V and 5-V outputs

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PMP23486 — 1.2W LLC isolated bias supply reference design using sector wound planar transformer
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* Test report 1.2W LLC Isolated Bias Supply Reference Design Using Sector Wound Planar Transformer PDF | HTML Sep 9, 2024

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