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reference designUCC25800A | Demoboard PMP31333

Texas Instruments UCC25800A | Demoboard PMP31333

Reinforced-isolation LLC converter reference design for SiC and GaN driving supply

Overview

TopologyLLC Resonant Converter
Input voltage24 V
Output 112 V / 0.2 A
IC revisionA

Description

This small form factor power supply provides bias power to isolated silicon carbide (SiC) or gallium nitride (GaN) MOSFET gate drivers when extremely high dV/dT on the secondary side is expected, such as wideband gap switches. The board accepts 24V input and supplies 12V at 200mA. The resonant inductor-inductor-capacitor (LLC) topology, combined to low primary to secondary winding capacitance, makes this converter an option for low-noise and high common-mode transient immunity (CMTI) applications, while reducing common-mode current injection through the transformer. Even though this isolated LLC converter works in open-loop, the output voltage keeps tracking VIN and has very low variation versus load current.

Features

  • Reinforced insulation
  • Extreme low primary-secondary winding capacitance
  • Regulated 24VIN to 12VOUT
  • Tested with 30µF switched output capacitance (first activation of high-side GaN or SiC-FET)
  • Resonant (secondary side) LLC topology

Typical applications

  • Onboard charger
  • AC drive control module, Central inverter, L2 Commercial Chargers

More information

Parts approved by Texas Instruments

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865060445005
SPECWCAP-ASLL Aluminum Electrolytic Capacitors, 100 µF, 25 V (DC)
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ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWCAP-ASLL Aluminum Electrolytic Capacitors
Capacitance100 µF
Rated Voltage25 V (DC)
Endurance 2000
Ripple Current300 mA
Impedance360 mΩ
Leakage Current25 µA
Dissipation Factor14 %
Diameter6.3 mm
Length7.7 mm
Packaging15" Tape & Reel 
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